SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549

                                  SCHEDULE 13G

                    Under the Securities Exchange Act of 1934
                               (Amendment No. 6 )*

                       PETROLEUM HELICOPTERS INCORPORATED
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                                (Name of Issuer)

                               VOTING COMMON STOCK
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                         (Title of Class of Securities)

                                   716604 10 3
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                                 (CUSIP Number)

                                DECEMBER 31, 2004
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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 disclosures 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).



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CUSIP No. 716604 10 3                   13G                    Page 2 of 7 Pages
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1     Names of Reporting Persons/I.R.S. Identification Nos. of Above Persons
      (entities only)

      WOODBOURNE PARTNERS, L.P.
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2     Check the Appropriate Box if a Member of a Group (See Instructions)
                                                                         (a) [ ]
                                                                         (b) [ ]
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3     SEC Use Only
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4     Citizenship or Place of Organization

      MISSOURI
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                  5     Sole Voting Power
              
                        -0-
                  --------------------------------------------------------------
   Number of      6     Shared Voting Power
     Shares
  Beneficially          -0-
    Owned by      --------------------------------------------------------------
      Each        7     Sole Dispositive Power
   Reporting
  Person With           -0-
                  --------------------------------------------------------------
                  8     Shared Dispositive Power

                        -0-
--------------------------------------------------------------------------------
9     Aggregate Amount Beneficially Owned by Each Reporting Person

      233,300
--------------------------------------------------------------------------------
10    Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See
      Instructions)                                                          [ ]
--------------------------------------------------------------------------------
11    Percent of Class Represented by Amount in Row (9)

      8.2%
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12    Type of Reporting Person (See Instructions)

      PN
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CUSIP No. 716604 10 3                   13G                    Page 3 of 7 Pages
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1     Names of Reporting Persons/I.R.S. Identification Nos. of Above Persons
      (entities only)

      CLAYTON MANAGEMENT COMPANY
--------------------------------------------------------------------------------
2     Check the Appropriate Box if a Member of a Group (See Instructions) 
                                                                         (a) [ ]
                                                                         (b) [ ]
--------------------------------------------------------------------------------
3     SEC Use Only
--------------------------------------------------------------------------------
4     Citizenship or Place of Organization

      MISSOURI
--------------------------------------------------------------------------------
                  5     Sole Voting Power
              
                        233,300
                  --------------------------------------------------------------
  Number of       6     Shared Voting Power
   Shares
Beneficially            -0-
  Owned by        --------------------------------------------------------------
    Each          7     Sole Dispositive Power
  Reporting
 Person With            233,300
                  --------------------------------------------------------------
                  8     Shared Dispositive Power

                        -0-
--------------------------------------------------------------------------------
9     Aggregate Amount Beneficially Owned by Each Reporting Person

      233,300
--------------------------------------------------------------------------------
10    Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See
      Instructions)                                                          [ ]
--------------------------------------------------------------------------------
11    Percent of Class Represented by Amount in Row (9)

      8.2%
--------------------------------------------------------------------------------
12    Type of Reporting Person (See Instructions)

      CO
--------------------------------------------------------------------------------


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CUSIP No. 716604 10 3                   13G                    Page 4 of 7 Pages
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1     Names of Reporting Persons/I.R.S. Identification Nos. of Above Persons
      (entities only)

      JOHN D. WEIL
--------------------------------------------------------------------------------
2     Check the Appropriate Box if a Member of a Group (See Instructions) 
                                                                         (a) [ ]
                                                                         (b) [ ]
--------------------------------------------------------------------------------
3     SEC Use Only
--------------------------------------------------------------------------------
4     Citizenship or Place of Organization

      MISSOURI
--------------------------------------------------------------------------------
                  5     Sole Voting Power
            
                        233,300
                  --------------------------------------------------------------
  Number of       6     Shared Voting Power
   Shares
Beneficially            -0-
  Owned by        --------------------------------------------------------------
    Each          7     Sole Dispositive Power
  Reporting
 Person With            233,300
                  --------------------------------------------------------------
                  8     Shared Dispositive Power

                        -0-
--------------------------------------------------------------------------------
9     Aggregate Amount Beneficially Owned by Each Reporting Person

      233,300
--------------------------------------------------------------------------------
10    Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See
      Instructions)                                                          [ ]
--------------------------------------------------------------------------------
11    Percent of Class Represented by Amount in Row (9)

      8.2%
--------------------------------------------------------------------------------
12    Type of Reporting Person (See Instructions)

      IN
--------------------------------------------------------------------------------


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CUSIP No. 716604 10 3                   13G                    Page 5 of 7 Pages
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                         AMENDMENT NO. 3 TO SCHEDULE 13G

      The Reporting Person reported the acquisition of shares of Voting Common
Stock ("Stock") of Petroleum Helicopters Incorporated, a Delaware corporation
("Issuer"), 113 Borman Drive, P.O. Box 23502, Lafayette, LA 70508, in an initial
filing of this Schedule 13G on February 16, 1999. In this regard, Item 4 (as
heretofore amended) is hereby amended as follows. All other items are unchanged
from the initial filing, as amended.

ITEM 4.     Ownership.



                                                                                            WEIL
                                                                      CLAYTON         (sole director and
                                                                   (general partner     shareholder of
                                                      WOODBOURNE    of Woodbourne)         Clayton)
                                                      ----------   ----------------   ------------------       
                                                                                 
(a)   Amount beneficially owned:                       233,300          233,300             233,300

(b)   Percent of Class:                                    8.2%             8.2%                8.2%

(c) Number of Shares as to which the person has:

      (i) Sole power to vote or direct the vote:           -0-          233,300             233,300
                                                          
      (ii) Shared power to vote or direct the vote:        -0-              -0-                 -0- 
                                                          
      (iii) Sole power to dispose or to direct the
            disposition of:                                -0-          233,300             233,300

      (iv) Shared power to dispose or to direct the
            disposition of:                                -0-              -0-                 -0-


Percentage figures are based on 2,852,616 shares outstanding as of October 31,
2004 based on the company's most recent 10-Q filing with the SEC.



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CUSIP No. 716604 10 3                   13G                    Page 6 of 7 Pages
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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.

      Dated: February 10, 2005                   WOODBOURNE PARTNERS, L.P.,

                                                 by its General Partner, CLAYTON
                                                 MANAGEMENT COMPANY

                                                 /s/ John D. Weil 
                                                 -----------------------
                                                 John D. Weil, President

      Dated: February 10, 2005                   CLAYTON MANAGEMENT COMPANY

                                                 /s/ John D. Weil
                                                 -----------------------
                                                 John D. Weil, President

      Dated: February 10, 2005                   /s/ John D. Weil  
                                                 ------------------------
                                                 John D. Weil



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CUSIP No. 716604 10 3                   13G                    Page 7 of 7 Pages
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                            EXHIBIT A TO SCHEDULE 13G

                     AGREEMENT PURSUANT TO RULE 13d-1(k)(1)

      The undersigned persons, on February 10, 2005, agree and consent to the
joint filing on their behalf of this Amendment No. 4 to Schedule 13G in
connection with their beneficial ownership of the voting common stock of
Petroleum Helicopters Incorporated.

                                                 WOODBOURNE PARTNERS, L.P.,

                                                 by its General Partner, CLAYTON
                                                 MANAGEMENT COMPANY

                                                     /s/ John D. Weil
                                                 -----------------------
                                                 John D. Weil, President

                                                 CLAYTON MANAGEMENT COMPANY

                                                     /s/ John D. Weil
                                                 -----------------------
                                                 John D. Weil, President

                                                     /s/ John D. Weil
                                                 -----------------------
                                                 John D. Weil