UNITED STATES
                      SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                 SCHEDULE 13G


                   Under the Securities Exchange Act of 1934
                               (Amendment No. )*


                            Aerocentury Corporation
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                               (Name of Issuer)


                                 COMMON STOCK
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                          (Title of Class Securities)


                                   007737109
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                                (CUSIP Number)


                                December 31, 2007
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            (Date of Event Which Requires Filing of this Statement)


Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:

      |_|   Rule 13d-1(b)

      |X|   Rule 13d-1(c)

      |_|   Rule 13d-1(d)

*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter the
disclosure provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).



..........................
CUSIP No.  007737109
..........................

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      Name of Reporting Persons.
1     I.R.S. Identification Nos. of above persons (entities only).

      William C. Ward


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      Check the Appropriate Box if a Member of a Group (See Instructions)
2
      (a)

      (b)

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      SEC Use Only
3

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      Citizenship or Place of Organization
4
      USA

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              5    Sole Voting Power    77,500




  number of shares
beneficially owned by
each reporting person
       with


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              6    Shared Voting Power


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              7    Sole Dispositive Power

77,500
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              8    Shared Dispositive Power


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9     Aggregate Amount Beneficially Owned by Each Reporting Person

77,500
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10    Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See
      Instructions)


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11    Percent of Class Represented by Amount in Row (9)
5.02%
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12    Type  of Reporting Person (See Instructions)
      IN
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Item 1.

    (a) Name of Issuer

        Aerocentury Corporation

    (b) Address of Issuer's Principal Executive Offices

         1440 Chapin Ave., Suite 310
         Burlingame, CA 94010

Item 2.

    (a) Name of Person Filing

        The person filing this report is William C. Ward ("Ward") who is
        the controlling member of Headstream Advisors, LLC ("Advisor").

        The principal business of each Fund is to invest in securities.

        Mr. Ward has never been convicted in any criminal proceeding
        (excluding traffic violations or similar misdemeanors), nor has Mr.
        Ward been a party to any civil proceeding commenced before a
        judicial or administrative body of competent jurisdiction as a result
        of which he was or is now subject to a judgment, decree or final order
        enjoining future violations of, or prohibiting or mandating activities
        subject to, federal or state securities laws or finding any violation
        with respect to such laws.  Mr. Ward is a citizen of the United
        States.

        Information with respect to each Reporting Person is given solely by the
        respective Reporting Person, and no Reporting Person undertakes hereby
        any responsibility for the accuracy or completeness or such information
        concerning any other Reporting Person.


    (b) Address of Principal Business office or, if None, Residence

        The principal office and business address of Mr. Ward is
        5949 Sherry Lane, Suite 1735, Dallas, TX 75225

    (c) Citizenship

        USA

    (d) Title of Class Securities

        Common Stock

    (e) CUSIP Number

        007737109

Item 3. If this statement is filed pursuant to ss 240.13d-1(b), or ss
         240.13d-2(b) or (c), check whether the person filing is a:

        N/A

Item 4. Ownership

        Common Stock:

        As of December 31, 2007, the Reporting Persons directly or
        indirectly beneficially owned 77,500 shares, or 5.02%, of Common
        Stock of Aerocentury Corporation (the approximate percentage of
        the shares of Common Stock owned is based on 1,543,000
        shares of common stock outstanding by Aerocentury Corporation,
        on December 31, 2007).

Item 5. Ownership of Five Percent or Less of a Class.

        If this statement is being filed to report the fact that as of the date
        hereof the reporting person has ceased to be the beneficial owner of
        more than five percent of the class securities, check the following | |

Item 6. Ownership of More than Five Percent on Behalf of Another Person.

        Advisor, and Ward, the majority owner and managing member of Advisor,
        have the right or the power to direct the receipt of dividends from
        Common Stock, and to direct the receipt of proceeds from the sale of
        Common Stock to Advisor's investment advisory clients. Headstream
        Advisors, LLC owns more than 5% of the Common Stock.

Item 7. Identification and Classification of the Subsidiary Which Acquired the
        Security Being Reported on By the Parent Holding Company.

        Not Applicable

Item 8. Identification of Members of the Group.

        Not Applicable

Item 9. Notice of Dissolution of Group.

        Not Applicable.

Item 10.    Certification:

            By signing below I certify that, to the best of my knowledge and
            belief, the securities referred to above were not acquired and are
            not held for the purpose of or with the effect of changing or
            influencing the control of the issuer of the securities and were not
            acquired and are not held in connection with or as a participant in
            any transaction having that purpose or effect.


                                   SIGNATURE
Date:  February 15, 2008


                             William C. Ward

                           /s/ William C. Ward
               ------------------------------------------
                             William C. Ward