<DOCUMENT>
<TYPE>EX-99.A1
<SEQUENCE>4
<FILENAME>ex-99_a1.txt
<DESCRIPTION>TRUST AGREEMENT
<TEXT>

                             FT 666

                         TRUST AGREEMENT

                     Dated:  March 12, 2003

     The  Trust Agreement among First Trust Portfolios, L.P.,  as
Depositor,  JPMorgan  Chase  Bank, as  Trustee  and  First  Trust
Advisors L.P., as Evaluator and Portfolio Supervisor, sets  forth
certain  provisions in full and incorporates other provisions  by
reference to the document entitled "Standard Terms and Conditions
of  Trust for The First Trust Special Situations Trust, Series 18
and  certain  subsequent  Series,  effective  October  15,  1991"
(herein called the "Standard Terms and Conditions of Trust"), and
such  provisions  as are incorporated by reference  constitute  a
single  instrument.   All  references  herein  to  Articles   and
Sections  are to Articles and Sections of the Standard Terms  and
Conditions of Trust.


                        WITNESSETH THAT:

     In   consideration  of  the  premises  and  of  the   mutual
agreements  herein  contained, the Depositor,  the  Trustee,  the
Evaluator and the Portfolio Supervisor agree as follows:


                             PART I


             STANDARD TERMS AND CONDITIONS OF TRUST

     Subject  to  the provisions of Part II and Part III  hereof,
all the provisions contained in the Standard Terms and Conditions
of  Trust  are herein incorporated by reference in their entirety
and  shall be deemed to be a part of this instrument as fully and
to  the same extent as though said provisions had been set  forth
in full in this instrument.


                             PART II


              SPECIAL TERMS AND CONDITIONS OF TRUST


               EQUITY INCOME & TREASURY PORTFOLIO

     The following special terms and conditions are hereby agreed
to:

     A.     The  Securities  initially  deposited  in  the  Trust
pursuant to Section 2.01 of the Standard Terms and Conditions  of
Trust are set forth in the Schedules hereto.

     B.   The aggregate number of Units outstanding for the Trust
on  the  Initial  Date  of  Deposit and  the  initial  fractional
undivided  interest in and ownership of the Trust represented  by
each  Unit thereof are set forth in the Prospectus in the section
"Summary of Essential Information."

     Documents  representing this number of Units for  the  Trust
are  being delivered by the Trustee to the Depositor pursuant  to
Section 2.03 of the Standard Terms and Conditions of Trust.

     C.    The Percentage Ratio on the Initial Date of Deposit is
as set forth in the Prospectus under "Schedule of Investments."

     D.    The  Record  Dates  shall  be  as  set  forth  in  the
prospectus under "Summary of Essential Information."

     E.    The  Distribution Date shall be as set  forth  in  the
Prospectus under "Summary of Essential Information."

     F.    The Mandatory Termination Date for the Trust shall  be
as  set  forth  in  the  Prospectus under "Summary  of  Essential
Information."

     G.   First Trust Advisors L.P.'s compensation as referred to
in  Section  4.03 of the Standard Terms and Conditions  of  Trust
shall be an annual fee in the amount of $.0080 per Unit.

     H.     The   Trustee's   Compensation   Rate   pursuant   to
Section 6.04 of the Standard Terms and Conditions of Trust  shall
be  an  annual  fee in the amount of $.0096 per Unit,  calculated
based  on  the  largest  number of Units outstanding  during  the
calendar  year  except  during the  initial  offering  period  as
determined in Section 4.01 of this Indenture, in which  case  the
fee   is  calculated  based  on  the  largest  number  of   units
outstanding during the period for which the compensation is  paid
(such  annual fee to be pro rated for any calendar year in  which
the  Trustee provides services during less than the whole of such
year).  However, in no event, except as may otherwise be provided
in  the Standard Terms and Conditions of Trust, shall the Trustee
receive compensation in any one year from any Trust of less  than
$2,000 for such annual compensation.

     I.    The Initial Date of Deposit for the Trust is March 12,
2003.

     J.    The  minimum amount of Securities to be  sold  by  the
Trustee  pursuant  to  Section 5.02  of  the  Indenture  for  the
redemption of Units shall be 100 shares.

     K.    The Treasury Obligations Maturity Date shall be as set
forth in the Prospectus under "Schedule of Investments."


                             PART II


              SPECIAL TERMS AND CONDITIONS OF TRUST


  THE KEY 3 GROWTH AND TREASURY SECURITIES PORTFOLIO, SERIES 3

     The following special terms and conditions are hereby agreed
to:

     A.     The  Securities  initially  deposited  in  the  Trust
pursuant to Section 2.01 of the Standard Terms and Conditions  of
Trust are set forth in the Schedules hereto.

     B.   The aggregate number of Units outstanding for the Trust
on  the  Initial  Date  of  Deposit and  the  initial  fractional
undivided  interest in and ownership of the Trust represented  by
each  Unit thereof are set forth in the Prospectus in the section
"Summary of Essential Information."

     Documents  representing this number of Units for  the  Trust
are  being delivered by the Trustee to the Depositor pursuant  to
Section 2.03 of the Standard Terms and Conditions of Trust.

     C.    The Percentage Ratio on the Initial Date of Deposit is
as set forth in the Prospectus under "Schedule of Investments."

     D.    The  Record  Dates  shall  be  as  set  forth  in  the
prospectus under "Summary of Essential Information."

     E.    The  Distribution Date shall be as set  forth  in  the
Prospectus under "Summary of Essential Information."

     F.    The Mandatory Termination Date for the Trust shall  be
as  set  forth  in  the  Prospectus under "Summary  of  Essential
Information."

     G.   First Trust Advisors L.P.'s compensation as referred to
in  Section  4.03 of the Standard Terms and Conditions  of  Trust
shall be an annual fee in the amount of $.0080 per Unit.

     H.     The   Trustee's   Compensation   Rate   pursuant   to
Section 6.04 of the Standard Terms and Conditions of Trust  shall
be  an  annual  fee in the amount of $.0096 per Unit,  calculated
based  on  the  largest  number of Units outstanding  during  the
calendar  year  except  during the  initial  offering  period  as
determined in Section 4.01 of this Indenture, in which  case  the
fee   is  calculated  based  on  the  largest  number  of   units
outstanding during the period for which the compensation is  paid
(such  annual fee to be pro rated for any calendar year in  which
the  Trustee provides services during less than the whole of such
year).  However, in no event, except as may otherwise be provided
in  the Standard Terms and Conditions of Trust, shall the Trustee
receive compensation in any one year from any Trust of less  than
$2,000 for such annual compensation.

     I.    The Initial Date of Deposit for the Trust is March 12,
2003.

     J.    The  minimum amount of Securities to be  sold  by  the
Trustee  pursuant  to  Section 5.02  of  the  Indenture  for  the
redemption of Units shall be 100 shares.


     K.   The Treasury Obligations Maturity Date shall be as set
forth in the Prospectus under "Schedule of Investments."


                            PART III

     A.     Notwithstanding  anything  to  the  contrary  in  the
Standard  Terms and Conditions of Trust, references to subsequent
Series  established after the date of effectiveness of the  First
Trust Special Situations Trust, Series 24 shall include FT 666.

     B.   For purposes of this Trust, Units of the Trust will not
be  rated by Standard & Poor's Ratings Services and any reference
to  such  rating or any requirement that information be forwarded
to  Standard & Poor's Ratings Services in the Standard Terms  and
Conditions of Trust shall be inapplicable.

     C.    For  purposes  of this Trust, all  references  in  the
Standard  Terms  and  Conditions of  Trust  including  provisions
thereof  amended hereby to "1.00 per Unit" shall  be  amended  to
read  "10.00  per Unit" and all references to "per  1,000  Units"
shall be amended to read "per 100 Units."

     D.    For  purposes  of  this Trust, any  reference  in  the
Standard  Terms  and  Conditions of  Trust  to  "140%"  shall  be
replaced  with  "110%" in relation to the amount  of  cash  or  a
Letter of Credit needed to acquire Treasury Obligations.

     E.    The  term  "Principal Account" as  set  forth  in  the
Standard Terms an Conditions of Trust shall be replaced with  the
term "Capital Account."

     F.   Section 1.01(2) shall be amended to read as follows:

           "(2) "Trustee" shall mean JPMorgan Chase Bank, or  any
successor trustee appointed as hereinafter provided."

     All references to United States Trust Company of New York in
the  Standard Terms and Conditions of Trust shall be  amended  to
refer to JPMorgan Chase Bank.

     G.   Section 1.01(3) shall be amended to read as follows:

          "(3)  "Evaluator" shall mean First Trust Advisors  L.P.
     and  its  successors in interest, or any successor evaluator
     appointed as hereinafter provided."

     H.   Section 1.01(4) shall be amended to read as follows:

          "(4)  "Portfolio  Supervisor" shall  mean  First  Trust
     Advisors  L.P.  and  its  successors  in  interest,  or  any
     successor  portfolio  supervisor  appointed  as  hereinafter
     provided."

     I.    Paragraph (b) of Section 2.01 shall be restated in its
entirety as follows:

          (b)(1)From time to time following the Initial  Date  of
     Deposit,  the  Depositor  is  hereby  authorized,   in   its
     discretion,  to  assign,  convey to  and  deposit  with  the
     Trustee (i) additional Securities, duly endorsed in blank or
     accompanied  by all necessary instruments of assignment  and
     transfer  in proper form, (ii) Contract Obligations relating
     to  such  additional Securities, accompanied by cash  and/or
     Letter(s)  of Credit as specified in paragraph (c)  of  this
     Section  2.01, or (iii) cash (or a Letter of Credit in  lieu
     of   cash)   with   instructions  to   purchase   additional
     Securities,  in an amount equal to the portion of  the  Unit
     Value  of the Units created by such deposit attributable  to
     the   Securities   to   be  purchased   pursuant   to   such
     instructions.    Except  as  provided   in   the   following
     subparagraphs (2), (3) and (4) the Depositor, in each  case,
     shall  ensure  that  each deposit of  additional  Securities
     pursuant  to  this  Section shall  maintain,  as  nearly  as
     practicable,  the Percentage Ratio.  Each  such  deposit  of
     additional Securities shall be made pursuant to a Notice  of
     Deposit  of Additional Securities delivered by the Depositor
     to   the   Trustee.   Instructions  to  purchase  additional
     Securities shall be in writing, and shall specify  the  name
     of  the  Security,  CUSIP number, if any, aggregate  amount,
     price  or price range and date to be purchased.  The Trustee
     shall  not  accept  any  deposit pursuant  to  this  Section
     2.01(b)   unless  the  Depositor  and  Trustee   have   each
     determined  that  the  maturity value  of  the  Zero  Coupon
     Obligations included in the deposit, divided by  the  number
     of  Units  created  by  reason of the deposit,  shall  equal
     $10.00; written certifications of such determinations  shall
     be  executed  by the Depositor and Trustee and preserved  in
     the  Trust  records.  The Depositor shall, at  its  expense,
     cause  independent public accountants to review the  Trust's
     holdings  (i)  at such time as the depositor  determines  no
     further  deposits shall be made pursuant to  this  paragraph
     and  (ii),  if  earlier, as of the 90th  day  following  the
     initial  deposit, for the purpose of certifying whether  the
     face  value of the Zero Coupon Obligations then held by  the
     Trust  divided by the Units then outstanding equals  $10.00.
     When  requested by the Trustee, the Depositor shall  act  as
     broker   to  execute  purchases  in  accordance  with   such
     instructions;   the   Depositor   shall   be   entitled   to
     compensation therefor in accordance with applicable law  and
     regulations.   The Trustee shall have no liability  for  any
     loss  or  depreciation  resulting  from  any  purchase  made
     pursuant  to  the Depositor's instructions or  made  by  the
     Depositor as broker.

          (2)   Additional  Securities (or  Contract  Obligations
     therefor)  may, at the Depositor's discretion, be  deposited
     or purchased in round lots.  If the amount of the deposit is
     insufficient  to acquire round lots of each Security  to  be
     acquired,  the additional Securities shall be  deposited  or
     purchased  in  the order of the Security in the  Trust  most
     under-represented  immediately  before  the   deposit   with
     respect to the Percentage Ratio.

          (3)   If  at  the  time  of  a  deposit  of  additional
     Securities, Securities of an issue deposited on the  Initial
     Date  of  Deposit (or of an issue of Replacement  Securities
     acquired  to replace an issue deposited on the Initial  Date
     of   Deposit)  are  unavailable,  cannot  be  purchased   at
     reasonable  prices  or  their  purchase  is  prohibited   or
     restricted  by  applicable law, regulation or policies,  the
     Depositor  may  (i)  deposit, or  instruct  the  Trustee  to
     purchase,  in  lieu thereof, another issue of Securities  or
     Replacement Securities or (ii) deposit cash or a  letter  of
     credit  in an amount equal to the valuation of the issue  of
     Securities   whose   acquisition  is   not   feasible   with
     instructions to acquire such Securities of such  issue  when
     they become available.

          (4)    Any  contrary  authorization  in  the  preceding
     subparagraphs (1) through (3) notwithstanding,  deposits  of
     additional   Securities  made  after   the   90-day   period
     immediately  following the Initial Date of  Deposit  (except
     for deposits made to replace Failed Contract Obligations  if
     such  deposits  occur within 20 days  from  the  date  of  a
     failure  occurring within such initial 90-day period)  shall
     maintain  exactly the Percentage Ratio existing  immediately
     prior to such deposit.

          (5)   In connection with and at the time of any deposit
     of  additional Securities pursuant to this Section  2.01(b),
     the  Depositor  shall  exactly replicate  Cash  (as  defined
     below) received or receivable by the Trust as of the date of
     such deposit.  For purposes of this paragraph, "Cash" means,
     as  to  the  Capital Account, cash or other property  (other
     than   Securities)  on  hand  in  the  Capital  Account   or
     receivable and to be credited to the Capital Account  as  of
     the   date  of  the  deposit  (other  than  amounts  to   be
     distributed  solely to persons other than holders  of  Units
     created by the deposit) and, as to the Income Account,  cash
     or  other property (other than Securities) received  by  the
     Trust  as  of the date of the deposit or receivable  by  the
     Trust  in  respect  of a record date  for  a  payment  on  a
     Security  which has occurred or will occur before the  Trust
     will  be the holder of record of a Security, reduced by  the
     amount  of any cash or other property received or receivable
     on  any Security allocable (in accordance with the Trustee's
     calculations  of  distributions  from  the  Income   Account
     pursuant  to Section 3.05) to a distribution made or  to  be
     made  in  respect of a Record Date occurring  prior  to  the
     deposit.   Such replication will be made on the basis  of  a
     fraction,  the  numerator of which is the  number  of  Units
     created by the deposit and the denominator of which  is  the
     number  of Units which are outstanding immediately prior  to
     the deposit."

     J.    The following shall be added immediately following the
first sentence of paragraph (c) of Section 2.01:

          "The Trustee may allow the Depositor to substitute  for
     any  Letter(s)  of  Credit deposited  with  the  Trustee  in
     connection  with  the deposits described in Section  2.01(a)
     and  (b)  cash  in  an  amount  sufficient  to  satisfy  the
     obligations  to which the Letter(s) of Credit relates.   Any
     substituted  Letter(s) of Credit shall be  released  by  the
     Trustee."

     K.    Section  3.01 of the Standard Terms and Conditions  of
Trust shall be replaced in its entirety with the following:

          "Section 3.01.  Initial Cost.  Subject to reimbursement
     as  hereinafter provided, the cost of organizing  the  Trust
     and  the  sale  of  the Trust Units shall be  borne  by  the
     Depositor, provided, however, that the liability on the part
     of  the  Depositor under this section shall not include  any
     fees  or  other  expenses incurred in  connection  with  the
     administration  of  the  Trust  subsequent  to  the  deposit
     referred  to in Section 2.01.  At the earlier of six  months
     after  the Initial Date of Deposit or the conclusion of  the
     primary  offering period (as certified by the  Depositor  to
     the Trustee), the Trustee shall withdraw from the Account or
     Accounts  specified in the Prospectus or, if no  Account  is
     therein specified, from the Capital Account, and pay to  the
     Depositor   the   Depositor's   reimbursable   expenses   of
     organizing  the Trust in an amount certified to the  Trustee
     by  the Depositor.  In no event shall the amount paid by the
     Trustee  to  the Depositor for the Depositor's  reimbursable
     expenses  of  organizing the Trust exceed the estimated  per
     Unit   amount  of  organization  costs  set  forth  in   the
     Prospectus for the Trust multiplied by the number  of  Units
     of  the Trust outstanding at the earlier of six months after
     the Initial Date of Deposit or the conclusion of the primary
     offering period; nor shall the Depositor be entitled  to  or
     request  reimbursement for expenses of organizing the  Trust
     incurred  after the earlier of six months after the  Initial
     Date  of  Deposit or the conclusion of the primary  offering
     period.   If  the  cash balance of the  Capital  Account  is
     insufficient to make such withdrawal, the Trustee shall,  as
     directed by the Depositor, sell Securities identified by the
     Depositor, or distribute to the Depositor Securities  having
     a  value, as determined under Section 4.01 as of the date of
     distribution, sufficient for such reimbursement.  Securities
     sold  or  distributed  to  the Depositor  to  reimburse  the
     Depositor  pursuant  to  this  Section  shall  be  sold   or
     distributed  by  the Trustee, to the extent practicable,  in
     the  percentage  ratio  then  existing.   The  reimbursement
     provided for in this section shall be for the account of the
     Unit  holders  of record at the earlier of six months  after
     the Initial Date of Deposit or the conclusion of the primary
     offering  period.  Any assets deposited with the Trustee  in
     respect of the expenses reimbursable under this Section 3.01
     shall  be  held and administered as assets of the Trust  for
     all  purposes hereunder.  The Depositor shall deliver to the
     Trustee  any cash identified in the Statement of Net  Assets
     of  the Trust included in the Prospectus not later than  the
     expiration  of  the  Delivery  Period  and  the  Depositor's
     obligation  to  make such delivery shall be secured  by  the
     letter  of  credit deposited pursuant to Section 2.01.   Any
     cash  which the Depositor has identified as to be  used  for
     reimbursement  of  expenses pursuant to  this  Section  3.01
     shall be held by the Trustee, without interest, and reserved
     for  such purpose and, accordingly, prior to the earlier  of
     the  six  months  after the Initial Date of Deposit  or  the
     conclusion  of  the primary offering period,  shall  not  be
     subject  to distribution or, unless the Depositor  otherwise
     directs,  used for payment of redemptions in excess  of  the
     per Unit amount payable pursuant to the next sentence.  If a
     Unit holder redeems Units prior to the earlier of six months
     after  the Initial Date of Deposit or the conclusion of  the
     primary  offering period, the Trustee shall pay to the  Unit
     holder,  in addition to the Redemption Value of the tendered
     Units, unless otherwise directed by the Depositor, an amount
     equal to the estimated per Unit cost of organizing the Trust
     set  forth in the Prospectus, or such lower revision thereof
     most  recently communicated to the Trustee by the  Depositor
     pursuant to Section 5.01, multiplied by the number of  Units
     tendered for redemption; to the extent the cash on  hand  in
     the  Trust  is  insufficient for such payment,  the  Trustee
     shall  have the power to sell Securities in accordance  with
     Section  5.02.  As used herein, the Depositor's reimbursable
     expenses of organizing the Trust shall include the  cost  of
     the  initial preparation and typesetting of the registration
     statement,      prospectuses     (including      preliminary
     prospectuses),  the indenture, and other documents  relating
     to  the Trust, SEC and state blue sky registration fees, the
     cost of the initial valuation of the portfolio and audit  of
     the Trust, the initial fees and expenses of the Trustee, and
     legal and other out-of-pocket expenses related thereto,  but
     not  including  the  expenses incurred in  the  printing  of
     preliminary prospectuses and prospectuses, expenses incurred
     in  the  preparation  and printing of  brochures  and  other
     advertising materials and any other selling expenses.

      L.    The  second paragraph of Section 3.02 of the Standard
Terms  and  Conditions is hereby deleted and  replaced  with  the
following sentence:

          "Any  non-cash distributions (other than a  non-taxable
     distribution  of the shares of the distributing  corporation
     which  shall  be retained by a Trust) received  by  a  Trust
     shall be dealt with in the manner described at Section 3.12,
     herein,  and shall be retained or disposed of by such  Trust
     according  to  those  provisions.   The  proceeds   of   any
     disposition  shall be credited to the Income  Account  of  a
     Trust.   Neither  the  Trustee nor the  Depositor  shall  be
     liable  or responsible in any way for depreciation  or  loss
     incurred by reason of any such sale."

     M.   Section 3.05.II(a) of the Standard Terms and Conditions
of  Trust  is hereby amended to substitute the following sentence
for the first sentence of such paragraph:

          "II.  (a) On each Distribution Date, the Trustee  shall
     distribute  to each Unit holder of record at  the  close  of
     business  on  the  Record  Date immediately  preceding  such
     Distribution  Date  an amount per Unit equal  to  such  Unit
     holder's  Income Distribution (as defined below), plus  such
     Unit  holder's pro rata share of the balance of the  Capital
     Account  (except for monies on deposit therein  required  to
     purchase  Contract Obligations) computed as of the close  of
     business on such Record Date after deduction of any  amounts
     provided  in  Subsection  I, provided,  however,  that  with
     respect   to   distributions  other  than  the  distribution
     occurring in the month of December of each year, the Trustee
     shall  not  be  required  to make a  distribution  from  the
     Capital Account unless the amount available for distribution
     shall equal $1.00 per 100 Units."

          Each  Trust  shall  provide the following  distribution
     elections:  (1) distributions to be made by check mailed  to
     the post office address of the Unit holder as it appears  on
     the  registration books of the Trustee, or (2)  if  provided
     for   in   the   Prospectus  for  a  Trust,  the   following
     reinvestment option:

               The Trustee will, for any Unit holder who provides
          the  Trustee written instruction, properly executed and
          in  form satisfactory to the Trustee, received  by  the
          Trustee no later than its close of business 10 business
          days  prior to a Record Date (the "Reinvestment  Notice
          Date"),  reinvest such Unit holder's distribution  from
          the  Income and Capital Accounts in Units of the Trust,
          purchased  from  the  Depositor,  to  the  extent   the
          Depositor shall make Units available for such purchase,
          at  the  Depositor's offering price  as  of  the  third
          business day prior to the following Distribution  Date,
          and at such reduced sales charge as may be described in
          the prospectus for the Trusts.  If, for any reason, the
          Depositor  does  not have Units of the Trust  available
          for  purchase, the Trustee shall distribute  such  Unit
          holder's  distribution  from  the  Income  and  Capital
          Accounts  in the manner provided in clause (1)  of  the
          preceding paragraph.  The Trustee shall be entitled  to
          rely  on  a  written  instruction received  as  of  the
          Reinvestment Notice Date and shall not be  affected  by
          any  subsequent  notice to the contrary.   The  Trustee
          shall   have   no  responsibility  for  any   loss   or
          depreciation  resulting from any reinvestment  made  in
          accordance  with this paragraph, or for any failure  to
          make  such reinvestment in the event the Depositor does
          not make Units available for purchase.

          Any   Unit  holder  who  does  not  effectively   elect
     reinvestment in Units of their respective Trust pursuant  to
     the preceding paragraph shall receive a cash distribution in
     the  manner  provided in clause (1) of the second  preceding
     paragraph."

      N.    Paragraph (c) of Subsection II of Section 3.05 of the
Standard Terms and Conditions of Trust is hereby amended to  read
as follows:

          "On each Distribution Date the Trustee shall distribute
     to  each  Unit holder of record at the close of business  on
     the Record Date immediately preceding such Distribution Date
     an  amount  per  Unit equal to such Unit holder's  pro  rata
     share  of  the  balance of the Capital Account  (except  for
     monies  on  deposit  therein required to  purchase  Contract
     Obligations)  computed as of the close of business  on  such
     Record  Date  after  deduction of any  amounts  provided  in
     Subsection I."

     O.    Section 3.05 of Article III of the Standard Terms  and
Conditions  of  Trust  is  hereby  amended  by  deleting  Section
3.05.I.(d) and replacing Section 3.05.I.(b) with the following:

          "Section 3.05.I.(b) deduct from the Income Account  or,
     to  the extent funds are not available in such Account, from
     the Capital Account and pay to First Trust Advisors L.P. the
     amount  that it is entitled to receive pursuant  to  Section
     4.03."

     P.   Section 3.07 of the Standard Terms and Conditions of
Trust is amended to delete the word "and" at the end of Section
3.07(f) and replace Section 3.07(g) with the following:

     "(g)  that  such sale is required due to Units tendered  for
redemption;
       (h)  that the sale of Securities is necessary or advisable
in  order  to  maintain  the qualification  of  the  Trust  as  a
"regulated investment company" in the case of a Trust  which  has
elected to qualify as such; and
       (i)  that there has been a public tender offer made for  a
Security  or  a  merger or acquisition is announced  affecting  a
Security,  and  that in the opinion of the Sponsor  the  sale  or
tender  of  the  Security is in the best  interest  of  the  Unit
holders."

     Q.    Section  3.12 of the Standard Terms and Conditions  of
Trust  is  hereby deleted in its entirety and replaced  with  the
following language:

"Section  3.12.    Notice to Depositor.  In the  event  that  the
Trustee shall have been notified at any time of any action to  be
taken  or  proposed  to be taken by at least a  legally  required
number  of  holders  of  any  Zero  Coupon  Obligation,  if  any,
(including  but  not  limited  to  the  making  of  any   demand,
direction,  request, giving of any notice, consent or  waiver  or
the  voting  with respect to any amendment or supplement  to  any
indenture,  resolution, agreement or other  instrument  under  or
pursuant to which the Zero Coupon Obligations, if any, have  been
issued) the Trustee shall promptly notify the Depositor and shall
thereupon  take such action or refrain from taking any action  as
the Depositor shall in writing direct; provided, however, that if
the  Depositor shall not within five Business Days of the  giving
of  such  notice to the Depositor direct the Trustee to  take  or
refrain  from  taking  any action, the Trustee  shall  take  such
action as it, in its sole discretion, shall deem advisable.

     In  the  event that the Trustee shall have been notified  at
any time of any action to be taken or proposed to be taken by  at
least  a  legally  required  number  of  holders  of  any  Equity
Securities  deposited  in a Trust, the Trustee  shall  take  such
action or omit from taking any action, as appropriate, so  as  to
insure  that  the  Equity  Securities are  voted  as  closely  as
possible  in  the same manner and the same general proportion  as
are the Equity Securities held by owners other than the Trust.

     In  the  event  that an offer by the issuer of  any  of  the
Securities  or  any  other  party shall  be  made  to  issue  new
securities, or to exchange securities, for Trust Securities,  the
Trustee shall reject such offer.  However, should any exchange or
substitution  be  effected  notwithstanding  such  rejection   or
without  an  initial offer, any Securities, cash and/or  property
received  in exchange shall be deposited hereunder and  shall  be
promptly sold, if securities or property, by the Trustee pursuant
to  the  Depositor's direction, unless the Depositor advises  the
Trustee  to keep such securities or property.  The Depositor  may
rely on the Portfolio Supervisor in so advising the Trustee.  The
cash  received  in such exchange and cash proceeds  of  any  such
sales   shall  be  distributed  to  Unit  holders  on  the   next
distribution  date  in  the  manner set  forth  in  Section  3.05
regarding  distributions from the Capital Account.   The  Trustee
shall not be liable or responsible in any way for depreciation or
loss incurred by reason of any such sale.

     Neither the Depositor nor the Trustee shall be liable to any
person  for any action or failure to take action pursuant to  the
terms  of  this  Section 3.12 other than failure  to  notify  the
Depositor.

     Whenever new securities or property is received and retained
by  the  Trust pursuant to this Section 3.12, the Trustee  shall,
within  5 days thereafter, mail to all Unit holders of the  Trust
notices  of such acquisition unless legal counsel for  the  Trust
determines  that  such notice is not required by  The  Investment
Company Act of 1940, as amended."

     R.    Section  3.14 of the Standard Terms and Conditions  of
Trust  shall  be  deleted  and  any reference  thereto  shall  be
inapplicable.

     S.    Section  3.15 of the Standard Terms and Conditions  of
Trust  shall  be  deleted  and  any reference  thereto  shall  be
inapplicable.

     T.    Article  III of the Standard Terms and  Conditions  of
Trust  is  hereby  amended by inserting the  following  paragraph
which shall be entitled Section 3.16:

          "Section   3.16.   Deferred  Sales  Charge.    If   the
     prospectus  related to the Trust specifies a deferred  sales
     charge, the Trustee shall, on the dates specified in and  as
     permitted  by  such Prospectus (the "Deferred  Sales  Charge
     Payment  Dates"),  withdraw from  the  Capital  Account,  an
     amount per Unit specified in such Prospectus and credit such
     amount  to  a  special non-Trust account designated  by  the
     Depositor  out  of which the deferred sales charge  will  be
     distributed  to  or  on the order of the Depositor  on  such
     Deferred  Sales  Charge Payment Dates (the  "Deferred  Sales
     Charge Account").  If the balance in the Capital Account  is
     insufficient to make such withdrawal, the Trustee shall,  as
     directed  by  the  Depositor, advance  funds  in  an  amount
     required to fund the proposed withdrawal and be entitled  to
     reimbursement of such advance upon the deposit of additional
     monies  in  the Capital Account, and/or sell Securities  and
     credit  the  proceeds thereof to the Deferred  Sales  Charge
     Account,  provided,  however,  that  the  aggregate   amount
     advanced  by  the  Trustee at any time for  payment  of  the
     deferred  sales  charge shall not exceed  $15,000  and  also
     provided that Zero Coupon Obligations may not be sold to pay
     for  amounts  payable pursuant to this Section  3.17.   Such
     direction  shall,  if  the Trustee is  directed  to  sell  a
     Security,  identify  the Security to  be  sold  and  include
     instructions  as  to the execution of  such  sale.   In  the
     absence  of  such  direction by the Depositor,  the  Trustee
     shall  sell Securities sufficient to pay the deferred  sales
     charge  (and  any unreimbursed advance then outstanding)  in
     full,  and shall select Securities to be sold in such manner
     as  will  maintain (to the extent practicable) the  relative
     proportion  of number of shares of each Security then  held.
     The  proceeds of such sales, less any amounts  paid  to  the
     Trustee  in reimbursement of its advances, shall be credited
     to  the  Deferred Sales Charge Account.  If  a  Unit  holder
     redeems  Units  prior to full payment of the deferred  sales
     charge,  the  Trustee shall, if so provided in  the  related
     Prospectus,  on  the  Redemption  Date,  withhold  from  the
     Redemption Price payable to such Unit holder an amount equal
     to  the  unpaid  portion of the deferred  sales  charge  and
     distribute such amount to the Deferred Sales Charge Account.
     If  the Trust is terminated for reasons other than that  set
     forth  in Section 6.01(g), the Trustee shall, if so provided
     in  the related Prospectus, on the termination of the Trust,
     withhold from the proceeds payable to Unit holders an amount
     equal to the unpaid portion of the deferred sales charge and
     distribute such amount to the Deferred Sales Charge Account.
     If  the Trust is terminated pursuant to Section 6.01(g), the
     Trustee shall not withhold from the proceeds payable to Unit
     holders  any  amounts of unpaid deferred sales charges.   If
     pursuant  to  Section  5.02  hereof,  the  Depositor   shall
     purchase a Unit tendered for redemption prior to the payment
     in  full  of  the deferred sales charge due on the  tendered
     Unit,  the Depositor shall pay to the Unit holder the amount
     specified under Section 5.02 less the unpaid portion of  the
     deferred  sales  charge.  All advances made by  the  Trustee
     pursuant to this Section shall be secured by a lien  on  the
     Trust prior to the interest of the Unit holders."

     U.   The following Section 3.17 shall be added:

     "Section  3.17.   Creation  and  Development  Fee.   If  the
Prospectus  related  to  the  Trust  specifies  a  creation   and
development  fee,  the Trustee shall, at the  conclusion  of  the
primary  offering  period  for  a  Trust,  as  certified  by  the
Depositor  to the Trustee withdraw from the Capital  Account,  an
amount  equal  to  the  entire creation and development  fee  and
credit  such amount to a special non-Trust account designated  by
the  Depositor out of which the creation and development fee will
be  distributed  to the Depositor (the "Creation and  Development
Account").  The payment provided for in this section shall be for
the  account of Unit holders of record at the conclusion  of  the
primary offering period and sahll have no effect on the net asset
value  of Trust Units prior to such date.  If the balance in  the
Capital  Account  is  insufficient to make such  withdrawal,  the
Trustee shall, as directed by the Depositor, advance funds in  an
amount  required to fund the proposed withdrawal and be  entitled
to  reimbursement of such advance upon the deposit of  additional
monies  in the Capital Account, and/or sell Securities and credit
the  proceeds  thereof  to the Creation and Development  Account,
provided,  however,  that the aggregate amount  advanced  by  the
Trustee  at  any time for payment of the creation and development
fee  shall  not  exceed $15,000.  Such direction  shall,  if  the
Trustee is directed to sell a Security, identify the Security  to
be  sold  and  include instructions as to the execution  of  such
sale.   In  the  absence of such direction by the Depositor,  the
Trustee shall sell Securities sufficient to pay the creation  and
development  fee (and any unreimbursed advance then  outstanding)
in full, and shall select Securities to be sold in such manner as
will maintain (to the extent practicable) the relative proportion
of  number of shares of each Security then held.  The proceeds of
such sales, less any amounts paid to the Trustee in reimbursement
of   its  advances,  shall  be  credited  to  the  Creation   and
Development  Account.  If  the Trust is  terminated  pursuant  to
Section  6.01(g),  the Depositor agrees to reimburse  Unitholders
for any amounts of the Creation and Development Fee collected  by
the  Depositor to which it is not entitled. All advances made  by
the  Trustee pursuant to this Section shall be secured by a  lien
on  the  Trust  prior  to  the interest  of  Unit  holders.   The
Depositor  agrees to reimburse the Trust and any Unit holder  any
amount  of Creation and Development Fee it receives which exceeds
the amount which the Depositor may receive under applicable laws,
regulations and rules."

     V.   Article IV of the Standard Terms and Conditions of Trust is
hereby replaced with the following:


                           "ARTICLE IV

Evaluation of Securities; Compensation for Evaluation;  Portfolio
Supervision   and   Bookkeeping  and   Administrative   Services;
Succession

      Section  4.01.        Evaluation of Securities   (a)  First
Trust  Advisors L.P., acting in its capacity as Evaluator,  shall
determine separately, shall promptly furnish to the Trustee,  and
shall  furnish to the Depositor upon request, the value  of  each
issue   of  Securities  (including  Contract  Obligations)   (the
"Evaluation")  as of the close of trading on the New  York  Stock
Exchange  (generally  4:00 p.m. Eastern  time)  (the  "Evaluation
Time")  (i) on each Business Day during the period in  which  the
Units  are being offered for sale to the public and (ii)  on  any
other day on which a Trust Fund Evaluation is to be made pursuant
to  Section  5.01 or which is requested by the Depositor  or  the
Trustee.   As  part of the Trust Evaluation, the Evaluator  shall
determine separately and promptly furnish to the Trustee, and  to
the  Depositor  upon request, the Evaluation  of  each  issue  of
Securities  initially deposited in the Trust on the Initial  Date
of Deposit.  The Evaluator's determination of the offering prices
of  the  Securities  on  the Initial Date  of  Deposit  shall  be
included in Schedule A attached to the Trust Agreement.

           (b)   During the initial offering period, namely, from
the date of effectiveness of the Registration Statement under the
Securities Act of 1933 relating to the Units to and including the
day  which  is  designated in writing by  the  Depositor  to  the
Trustee  and  Evaluator as the conclusion of  such  period,  such
Evaluation  shall  be  made  in the  following  manner:   if  the
Securities  are  listed  on  a  national  or  foreign  securities
exchange  or  The  Nasdaq  Stock Market,  such  Evaluation  shall
generally  be based on the closing sale price on the exchange  or
system  which  is the principal market therefor, which  shall  be
deemed  to  be the New York Stock Exchange if the Securities  are
listed   thereon   (unless  the  Evaluator   deems   such   price
inappropriate  as  a basis for evaluation), or  if  there  is  no
closing sale price on such exchange or system, at the closing ask
prices  of the Equity Securities.  If the Securities are  not  so
listed  or,  if  so listed and the principal market  therefor  is
other  than on an exchange or there is no closing sale  price  on
such  exchange, such Evaluation shall generally be based  on  the
following  methods  or  any  combination  thereof  whichever  the
Evaluator   deems  appropriate:   (a)  in  the  case  of   Equity
Securities, on the basis of the current ask price on the over-the-
counter   market   (unless  the  Evaluator   deems   such   price
inappropriate  as a basis for evaluation), (b) on  the  basis  of
current  offering  prices  for the  Zero  Coupon  Obligations  as
obtained from investment dealers or brokers who customarily  deal
in  securities comparable to those held by the Trust and, (c)  if
offering prices are not available for the Zero Coupon Obligations
or  the Equity Securities, on the basis of offering or ask  price
for  comparable securities, (d) by determining the  valuation  of
the  Zero  Coupon  Obligations or the Equity  Securities  on  the
offering  or ask side of the market by appraisal, or (e)  by  any
combination of the above.  If such prices are in a currency other
than  U.S.  dollars,  the Evaluation of such  Security  shall  be
converted to U.S. dollars based on current offering side exchange
rates,  unless  the  Security  is in  the  form  of  an  American
Depositary Share or Receipt, in which case the Evaluations  shall
be  based  upon the U.S. dollar prices in the market for American
Depositary  Shares or Receipts (unless the Evaluator  deems  such
prices inappropriate as a basis for evaluation).  As used herein,
the  closing sale price is deemed to mean the most recent closing
sale  price on the relevant securities exchange immediately prior
to the Evaluation Time.  For each Evaluation, the Evaluator shall
also confirm and furnish to the Trustee and the Depositor, on the
basis  of  the  information furnished to  the  Evaluator  by  the
Trustee  as  to  the  value  of  all  Trust  assets  other   than
Securities,  the calculation of the Trust Fund Evaluation  to  be
computed  pursuant  to Section 5.01.  For  the  purposes  of  the
foregoing,  the  Evaluator  may obtain  current  prices  for  the
Securities  from  investment dealers or  brokers  (including  the
Depositor) that customarily deal in similar securities.

           (c)  After the initial offering period and both during
and  after the initial offering period, for purposes of the Trust
Fund   Evaluations  required  by  Section  5.01  in   determining
Redemption  Value  and Unit Value, Evaluation of  the  Securities
shall be made in the manner described in Section 4.01(b), on  the
basis of current bid prices for Zero Coupon Obligations (if any),
the  bid  side  value  of  the relevant  currency  exchange  rate
expressed in U.S. dollars and, except in those cases in which the
Securities  are  listed  on  a  national  or  foreign  securities
exchange  or The Nasdaq Stock Market and the closing sale  prices
are  utilized,  on  the basis of the current bid  prices  of  the
Equity  Securities.  In addition, the Evaluator shall reduce  the
Evaluation  of  each  Security by the amount of  any  liquidation
costs  (other  than  brokerage costs  incurred  on  any  national
securities  exchange) and any capital gains or other taxes  which
would  be  incurred by the Trust upon the sale of such  Security,
such  taxes  being computed as if the Security were sold  on  the
date of the Evaluation.

      Section 4.02.       Information for Unit Holders.  For  the
purpose  of  permitting  Unit holders to  satisfy  any  reporting
requirements of applicable federal or state tax law, First  Trust
Advisors  L.P., acting in its capacity as Evaluator,  shall  make
available  to the Trustee and the Trustee shall transmit  to  any
Unit  holder upon request any determinations made by it  pursuant
to Section 4.01.

      Section  4.03.   Compensation for  Services  Provided.   As
compensation for providing portfolio supervisory services in  its
capacity  as  Portfolio Supervisor, evaluation  services  in  its
capacity  as Evaluator, and for providing bookkeeping  and  other
administrative services to the Trust of a character described  in
Section 26(a)(2)(C) of the Investment Company Act of 1940, and to
the  extent  that such services are in addition to,  and  do  not
duplicate, the services to be provided hereunder by the  Trustee,
First  Trust Advisors L.P. shall receive, in arrears,  against  a
statement or statements therefor submitted to the Trustee monthly
or  annually an aggregate annual fee in the per Unit  amount  set
forth in Part II of the Trust Agreement for the Trust, calculated
based  on  the  largest  number of Units outstanding  during  the
calendar  year,  except  during the initial  offering  period  as
determined in Section 4.01 of this Indenture, in which  case  the
fee   is  calculated  based  on  the  largest  number  of   Units
outstanding during the period for which the compensation is  paid
(such  annual fee to be pro rated for any calendar year in  which
First  Trust  Advisors  L.P. provides services  described  herein
during  less than the whole of such year).  Such fee  may  exceed
the actual cost of providing such services for the Trust, but  at
no time will the total amount received for such services rendered
to  unit  investment trusts of which the Depositor is the sponsor
in  any  calendar year exceed the aggregate cost to  First  Trust
Advisors  L.P.  of supplying such services in  such  year.   Such
compensation  may, from time to time, be adjusted  provided  that
the  total  adjustment  upward does not,  at  the  time  of  such
adjustment, exceed the percentage of the total increase after the
date  hereof in consumer prices for services as measured  by  the
United  States Department of Labor Consumer Price Index  entitled
"All  Services  Less Rent of Shelter" or similar index,  if  such
index  should no longer be published.  The consent or concurrence
of  any Unit holder hereunder shall not be required for any  such
adjustment or increase.  Such compensation shall be paid  by  the
Trustee,  upon  receipt of an invoice therefor from  First  Trust
Advisors L.P., which shall constitute the representation by First
Trust  Advisors  L.P.  that  the bookkeeping  and  administrative
services   for   which  compensation  is  claimed  are   properly
compensable  hereunder and that the aggregate  cost  incurred  by
First  Trust  Advisors  L.P. of providing portfolio  supervisory,
evaluation and bookkeeping and administrative services  hereunder
was   not   less  than  the  compensation  claimed,  upon   which
representation   the   Trustee  may  conclusively   rely.    Such
compensation  shall be charged against the Income and/or  Capital
Accounts in accordance with Section 3.05.

     If the cash balance in the Income and Capital Accounts shall
be  insufficient to provide for amounts payable pursuant to  this
Section  4.03,  the  Trustee shall have the  power  to  sell  (i)
Securities from the current list of Securities designated  to  be
sold  pursuant  to  Section  5.02 hereof,  or  (ii)  if  no  such
Securities  have  been  so designated,  such  Securities  as  the
Trustee  may see fit to sell in its own discretion, and to  apply
the  proceeds of any such sale in payment of the amounts  payable
pursuant to this Section 4.03.

      Any moneys payable to First Trust Advisors L.P. pursuant to
this  Section 4.03 shall be secured by a lien on the Trust  prior
to  the interest of Unit holders, but no such lien shall be prior
to  any  lien  in  favor of the Trustee under the  provisions  of
Section 6.04 herein.

     Section 4.04.  Liability of the Evaluator.  The Trustee, the
Depositor  and  the  Unit  holders may  rely  on  any  Evaluation
furnished by First Trust Advisors L.P., acting in its capacity as
Evaluator,  and  shall have no responsibility  for  the  accuracy
thereof.   The  determinations made by  the  Evaluator  hereunder
shall  be  made  in  good  faith  upon  the  basis  of  the  best
information  available to it.  The Evaluator shall  be  under  no
liability  to the Trustee, the Depositor or the Unit holders  for
errors in judgment; provided, however, that this provision  shall
not protect the Evaluator against any liability to which it would
otherwise be subject by reason of willful misfeasance, bad  faith
or gross negligence in the performance of its duties or by reason
of   its   reckless  disregard  of  its  obligations  and  duties
hereunder.

      Section  4.05.       Resignation and Removal  of  Portfolio
Supervisor   and/or  Evaluator  and/or  provider  of  bookkeeping
services  described in Section 4.03; Successor.  (a) First  Trust
Advisors  L.P. and any successor appointed as hereafter provided,
in  its  capacity as Evaluator and/or Portfolio Supervisor and/or
provider  of bookkeeping services described in Section 4.03,  may
resign and be discharged hereunder by executing an instrument  of
resignation in writing and filing the same with the Depositor and
the  Trustee, not less than 60 days before the date specified  in
such   instrument   when,  subject  to  Section   4.05(e),   such
resignation  is  to take effect.  Upon receiving such  notice  of
resignation, the Depositor and the Trustee shall use  their  best
efforts to appoint a successor to act in the capacity as to which
the  resignation  applies, such successor to have  qualifications
and  to be compensated at a rate of compensation satisfactory  to
the Depositor and the Trustee.  Such appointment shall be made by
written instrument executed by the Depositor and the Trustee,  in
duplicate, one copy of which shall be delivered to the  resigning
party  and  one  copy  to the successor.  The  Depositor  or  the
Trustee  may  remove  the Evaluator and/or  Portfolio  Supervisor
and/or  party performing bookkeeping and administrative  services
at  any time upon 30 days' written notice and appoint a successor
to  act  in  the  capacity  to which the  removed  applies,  such
successor to have qualifications and to be compensated at a  rate
of  compensation satisfactory to the Depositor and  the  Trustee,
provided,  however, that so long as First Trust Portfolios,  L.P.
is acting as Depositor, the Trustee shall have no power to remove
any  affiliate  of the Depositor who may be acting  in  any  such
capacity  or  capacities.   Such appointment  shall  be  made  by
written instrument executed by the Depositor and the Trustee,  in
duplicate,  one  copy of which shall be delivered  to  the  party
removed   and  one  copy  to  its  successor.   Notice  of   such
resignation  or removal and appointment of a successor  shall  be
mailed by the Trustee to each Unit holder then of record.

      (b)   Any  successor  evaluator and/or successor  portfolio
supervisor  and/or  provider  of bookkeeping  and  administrative
services  described  in  Section 4.03, as appropriate,  appointed
hereunder,  shall  execute,  acknowledge  and  deliver   to   the
Depositor   and   the  Trustee  an  instrument   accepting   such
appointment  hereunder, and such successor  without  any  further
act,  deed or conveyance shall become vested with all the rights,
powers, duties and obligations of its predecessor hereunder  with
like  effect as if originally named herein and shall be bound  by
all the terms and conditions of this Indenture.

      (c)   In  case  at any time the Evaluator and/or  Portfolio
Supervisor  and/or  provider  of bookkeeping  and  administrative
services  described in Section 4.03 shall resign and no successor
shall have been appointed and have accepted appointment within 30
days  after  notice  of  resignation has  been  received  by  the
Depositor  and  the  Trustee, the resigning party  may  forthwith
apply to a court of competent jurisdiction for the appointment of
a successor.  Such court may thereupon after such notice, if any,
as it may deem proper and prescribe, appoint a successor.

      (d)   Any  corporation  into  which  the  Evaluator  and/or
Portfolio   Supervisor  and/or  provider   of   bookkeeping   and
administrative services described in Section 4.03  hereunder  may
be   merged  or  with  which  it  may  be  consolidated,  or  any
corporation resulting from any merger or consolidation  to  which
the  Evaluator  and/or Portfolio Supervisor  and/or  provider  of
bookkeeping and administrative services described in Section 4.03
hereunder  shall  be a party, shall be the successor  under  this
Indenture   without  the  execution  or  filing  of  any   paper,
instrument  or further act to be done on the part of the  parties
hereto, notwithstanding anything to the contrary contained herein
or  in any agreement relating to such merger or consolidation  by
which  the Evaluator and/or Portfolio Supervisor and/or  provider
of  bookkeeping and administrative services described in  Section
4.03 may seek to retain certain powers, rights and privileges for
any period of time following such merger or consolidation.

      (e)   Any  resignation or removal of the  Evaluator  and/or
Portfolio   Supervisor  and/or  provider   of   bookkeeping   and
administrative  services described in Section 4.03  shall  become
effective  upon  acceptance of appointment by  the  successor  as
provided in subsection (b) hereof."

     W.    Section  5.01 of the Standard Terms and Conditions  of
Trust shall be amended as follows:

      (i)   The second sentence of the first paragraph of Section
5.01  shall  be  amended by deleting the phrase "and  (iii)"  and
adding  the following "(iii) amounts representing unpaid  accrued
organization  costs, (iv) if the Prospectus for a Trust  provides
that  the creation and development fee, if any, accrue on a daily
basis,   amounts   representing  unpaid  accrued   creation   and
development fees, (v)"; and

     (ii)  The following text shall immediately precede the last
sentence of the first paragraph of Section 5.01:

          "Prior   to  the  payment  to  the  Depositor  of   its
          reimbursable  organization costs  to  be  made  at  the
          conclusion  of  the  Organization  Expense  Period   in
          accordance   with   Section  3.01,  for   purposes   of
          determining  the  Trust  Fund  Evaluation  under   this
          Section  5.01, the Trustee shall rely upon the  amounts
          representing unpaid accrued organization costs  in  the
          estimated  amount per Unit set forth in the  Prospectus
          until  such time as the Depositor notifies the  Trustee
          in  writing  of  a  revised estimated amount  per  Unit
          representing unpaid accrued organization  costs.   Upon
          receipt  of  such notice, the Trustee  shall  use  this
          revised  estimated amount per Unit representing  unpaid
          accrued  organization  costs in determining  the  Trust
          Fund  Evaluation  but such revision  of  the  estimated
          expenses  shall  not  effect  calculations  made  prior
          thereto  and  no  adjustment shall be made  in  respect
          thereof."

     X.    Section  5.01 of the Standard Terms and Conditions  of
Trust  shall  be  amended  by inserting the  following  paragraph
immediately after the second paragraph of such section:

     "The Depositor is authorized to obtain from The NASDAQ Stock
Market, Inc. ("NASDAQ") Mutual Fund Quotation Service ("MFQS")  a
unit  investment trust ticker symbol for a Trust and to  contract
with  NASDAQ  for the dissemination of the Trust Fund  Evaluation
computed  by the Trustee pursuant to Section 5.01 of the Standard
Terms  and  Conditions  of  Trust  through  the  MFQS,  provided,
however, that no such contract shall affect the Trustee's  duties
or  liabilities without its prior consent.  When and as  directed
by  the  Depositor,  the  Trustee  shall  cause  the  Trust  Fund
Evaluation  to  be  communicated to MFQS for such  purpose.   The
Depositor  and  Trustee shall be reimbursed from  the  respective
Trust  for  any cost or expense incurred in connection  with  the
obtaining of the ticker symbol and the communication to MFQS  and
its  dissemination  of  the Trust Fund Evaluation.   Neither  the
Depositor nor the Trustee shall be liable for any error, omission
or other action of NASDAQ in connection with the dissemination of
the  Trust  Fund  Evaluation, and the Depositor and  the  Trustee
shall  be  indemnified by the respective Trust and held  harmless
against any loss, liability, claim or expense resulting from  any
error, omission or other action of NASDAQ.  In no event shall the
Trustee  be  liable  to  any  person for  special,  indirect,  or
consequential damages of any kind whatsoever resulting from or in
connection  with  the dissemination of the Trust Fund  Evaluation
through  MFQS whether or not the Trustee has been advised  as  to
the  possibility of such damages and regardless of  the  form  of
action in which any such claim for damages may be made."

      Y.    The  second paragraph of Section 5.02 of the Standard
Terms  and  Conditions of Trust is amended  by  substituting  the
following sentence for the third sentence of the second paragraph
of such Section:

          "If  such  available  fund shall be  insufficient,  the
          Trustee  shall  sell  such  Securities  as  have   been
          designated on the current list for such purpose by  the
          Portfolio  Supervisor, as hereinafter in  this  Section
          5.02  provided,  in  amounts  as  the  Trustee  in  its
          discretion shall deem advisable or necessary  in  order
          to  fund  the  Principal Account for purposes  of  such
          redemption,   provided  however,   that   Zero   Coupon
          Obligations  may not be sold unless the  Depositor  and
          Trustee,  which may rely on the advice of the Portfolio
          Supervisor, have determined that the face value of  the
          Zero  Coupon Obligations remaining after such  proposed
          sale,  divided by the number of Units outstanding after
          the  tendered Units are redeemed, shall equal or exceed
          $10.00;   a   written   certification   as   to    such
          determination  shall be executed by the  Depositor  and
          Trustee and preserved in the Trust records."

      Z.    Section 5.02 of the Standard Terms and Conditions  of
Trust  is  amended  by  adding  the following  after  the  second
paragraph of such section:

          "Notwithstanding  anything herein to the  contrary,  in
     the  event that any tender of Units pursuant to this Section
     5.02  would result in the disposition by the Trustee of less
     than a whole Security, the Trustee shall distribute cash  in
     lieu  thereof  and sell such Securities as directed  by  the
     Sponsors as required to make such cash available.

          Subject   to   the  restrictions  set  forth   in   the
     prospectus, Unit holders may redeem 2,500 Units or more of a
     Trust  and  request a distribution in kind of (i) such  Unit
     holder's  pro rata portion of each of the Equity  Securities
     in  such Trust, in whole shares, and (ii) cash equal to such
     Unit  holder's  pro rata portion of the Income  and  Capital
     Accounts  as  follows:  (x) a pro rata portion  of  the  net
     proceeds  of sale of the Equity Securities representing  any
     fractional  shares included in such Unit holder's  pro  rata
     share  of the Securities, (y) a pro rata portion of the  net
     proceeds of sale of the Zero Coupon Obligations in such Unit
     holder's  pro  rata share of the Securities,  and  (z)  such
     other cash as may properly be included in such Unit holder's
     pro rata share of the sum of the cash balances of the Income
     and  Principal Accounts in an amount equal to the Unit Value
     determined on the basis of a Trust Fund Evaluation  made  in
     accordance  with Section 5.01 determined by the  Trustee  on
     the  date  of tender less amounts determined in clauses  (i)
     and  (ii)(x) of this Section.  Subject to Section 5.05  with
     respect  to  Rollover Unit holders, if  applicable,  to  the
     extent possible, distributions of Securities pursuant to  an
     in  kind  redemption of Units shall be made by  the  Trustee
     through the distribution of each of the Securities in  book-
     entry  form  to  the account of the Unit  holder's  bank  or
     broker-dealer   at  the  Depository  Trust   Company.    Any
     distribution  in kind will be reduced by customary  transfer
     and registration charges."

     AA.   The  last sentence of the first paragraph  of  Section
5.02 of the Standard Terms and Conditions of Trust is amended  by
substituting  "4:00 p.m. Eastern time" for "12:00 p.m in the City
of New York."

     BB.   The third sentence of the seventh paragraph of Section
5.02 of the Standard Terms and Conditions of Trust is amended  by
deleting "a certification from the independent public accountants
to  the  effect described in the second paragraph of this Section
5.02"  and  in  its  place  inserting "a certification  from  the
Depositor  and  Trustee  to the effect described  in  the  second
paragraph of this Section 5.02."

     CC.   The third paragraph of Section 6.02 of the Standard
Terms and Conditions of Trust shall be deleted in its entirety
and replaced with the following:

     "If provided for in the Prospectus for a Trust, the Trustee
shall pay, or reimburse to the Depositor, the expenses related to
the updating of the Trust's registration statement, to the extent
of legal fees, typesetting fees, electronic filing expenses and
regulatory filing fees.  Such expenses shall be paid from the
Income Account, or to the extent funds are not available in such
Account, from the Capital Account, against an invoice or invoices
therefor presented to the Trustee by the Depositor.  By
presenting such invoice or invoices, the Depositor shall be
deemed to certify, upon which certification the Trustee is
authorized conclusively to rely, that the amounts claimed therein
are properly payable pursuant to this paragraph.  The Depositor
shall provide the Trustee, from time to time as requested, an
estimate of the amount of such expenses, which the Trustee shall
use for the purpose of estimating the accrual of Trust expenses.
The amount paid by the Trust pursuant to this paragraph in each
year shall be separately identified in the annual statement
provided to Unit holders.  The Depositor shall assure that the
Prospectus for the Trust contains such disclosure as shall be
necessary to permit payment by the Trust of the expenses
contemplated by this paragraph under applicable laws and
regulations.

     The provisions of this paragraph shall not limit the
authority of the Trustee to pay, or reimburse to the Depositor or
others, such other or additional expenses as may be determined to
be payable from the Trust as provided in Section 6.02 of the
Standard Terms and Conditions of Trust."

     DD.  The third sentence of paragraph (a) of Section 6.05  of
the  Standard Terms and Conditions of Trust shall be replaced  in
its entirety by the following:

     "The Depositor may remove the Trustee at any time with or
without cause and appoint a successor Trustee by written
instrument or instruments delivered not less than sixty days
prior to the effective date of such removal and appointment to
the Trustee so removed and to the successor Trustee."

     EE.   Section  8.02 of the Standard Terms and Conditions  of
Trust shall be amended as follows:

          (i)   The fourth sentence of the second paragraph shall
     be deleted and replaced with the following:

          "The Trustee will honor duly executed requests for  in-
     kind  distributions received (accompanied  by  the  electing
     Unit  holder's  Certificate, if  issued)  by  the  close  of
     business   ten   business  days  prior  to   the   Mandatory
     Termination Date."

          (ii)   The first sentence of the fourth paragraph shall
     be deleted and replaced with the following:

          "Commencing no earlier than the business day  following
     that  date on which Unit holders must submit to the  Trustee
     notice  of  their request to receive an in-kind distribution
     of Securities at termination, the Trustee will liquidate the
     Securities  not segregated for in-kind distributions  during
     such period and in such daily amounts as the Depositor shall
     direct."

     FF.  Section 1.01(11) shall be amended to read as follows:

          "Equity  Securities" shall mean shares of Common  Stock
     deposited in the Trust."

     IN  WITNESS WHEREOF, First Trust Portfolios, L.P.,  JPMorgan
Chase  Bank  and First Trust Advisors L.P. have each caused  this
Trust Agreement to be executed and the respective corporate  seal
to  be  hereto affixed and attested (if applicable) by authorized
officers; all as of the day, month and year first above written.

                                    FIRST TRUST PORTFOLIOS,
                                       L.P., Depositor


                                    By   Robert M. Porcellino
                                         Senior Vice President



                                    JPMorgan Chase Bank, Trustee


                                    By   Joan A. Currie
                                         Vice President
[SEAL]

ATTEST:

Arkadiy Zavulunov
Assistant Vice President


                                    FIRST TRUST ADVISORS L.P.,
                                       Evaluator


                                    By     Robert M. Porcellino
                                           Senior Vice President



                                    FIRST TRUST ADVISORS L.P.,
                                       Portfolio Supervisor


                                    By     Robert M. Porcellino
                                           Senior Vice President

                  SCHEDULE A TO TRUST AGREEMENT

                 Securities Initially Deposited
                             FT 666

     (Note:   Incorporated herein and made a part hereof for  the
Trust is the "Schedule of Investments" for the Trust as set forth
in the Prospectus.)


</TEXT>
</DOCUMENT>