As filed with the Securities and Exchange
                         Commission on April 30, 2001

                           PROXY STATEMENT PURSUANT
                      TO SECTION 14(A) OF THE SECURITIES
                    EXCHANGE ACT OF 1934 (AMENDMENT NO. 1)

Filed by the Registrant /x/ Filed by a party other than the Registrant / /

Check the appropriate box:
                 / /  Preliminary Proxy Statement
                 / /  Definitive Proxy Statement
                 /x/  Definitive Additional Materials
                 / /  Soliciting Material Pursuant to Rule 14a-12
                 / /  Confidential, for Use of the Commission Only
                        (as permitted by rule 14a-6(e)(2))

                      MUNIYIELD PENNSYLVANIA INSURED FUND
                P.O. Box 9011, Princeton, New Jersey 08543-9011
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               (Name of Registrant as Specified in Its Charter)


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   (Name of Person(s) Filing Proxy Statement, if other than the Registrant)


Payment of filing fee (Check the appropriate box):
/x/ No fee required.
/ / Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and 0-11.

(1)      Title of each class of securities to which transaction applies:

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(2)      Aggregate number of securities to which transaction applies:

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(3)      Per unit price or other underlying value of transaction computed
         pursuant to Exchange Act Rule 0-11 (Set forth the amount on which
         the filing fee is calculated and state how it was determined.):

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(4)      Proposed maximum aggregate value of transaction:

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(5)      Total fee paid:

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/ / Fee paid previously with preliminary materials:

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/ /      Check box if any part of the fee is offset as provided by
         Exchange Act Rule 0-11(a)(2) and identify the filing for which the
         offsetting fee was paid previously. Identify the previous filing by
         registration statement number, or the form or schedule and the date
         of its filing.


(1)      Amount previously paid:

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(2)      Form, Schedule or Registration Statement No.:

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(3)      Filing Party:

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(4)      Date Filed:

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                      MUNIYIELD PENNSYLVANIA INSURED FUND
                                 P.O. Box 9011
                       Princeton, New Jersey 08543-9011
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                                                               April 30, 2001

Dear Shareholder:

An annual meeting (the "Meeting") of the shareholders of MuniYield
Pennsylvania Insured Fund (the "Fund") was held on April 25, 2001 to elect a
new Board of Trustees of the Fund. Our records indicate that on February 28,
2001, the record date for the Meeting, you were a holder of common shares of
beneficial interest of the Fund. However, due to a processing error, the proxy
card or voting instruction form ("voting form") you received in the package of
proxy materials originally mailed to you was incorrect. Specifically, the
voting form listed the incorrect nominees for the Board of Trustees. Enclosed,
please find corrected voting form(s). If you have already sent in the voting
form you first received, please note that your vote will not be properly
recorded. Please use the enclosed form(s) to revote your shares. If you have
not yet voted, you may do so using the enclosed voting form(s). Also enclosed
for your convenience is another copy of the notice of meeting and proxy
statement for the Meeting. Your vote is very important to us. In order to
ensure that you have the opportunity to vote your shares, we have adjourned
the April 25, 2001 meeting until Wednesday, May 16, 2001.

Please sign, date and return your executed proxy in the enclosed postage paid
envelope, so that it will be received by May 16, 2001.

If you have any questions regarding the Meeting agenda or the execution of
your proxy, please call Shareholder Communications Corporation at
1-800-645-4519.

We very much regret this error and any inconvenience it may have caused you.
Thank you for your prompt attention.