SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                  SCHEDULE 13G


                    Under the Securities Exchange Act of 1934
                               (Amendment No. 1)*


                                   AAON, INC.
                                (Name of Issuer)

                          Common Stock, par value $.004
                         (Title of Class of Securities)

                                    000360206
                                 (CUSIP Number)


*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).



                                  SCHEDULE 13G


Item 1.

             (a)    Name of Issuer:  AAON, Inc.

             (b)    Address of Issuer's Principal Executive Office:

                         2425 South Yukon, Tulsa, Oklahoma 74107.


Item 2.

             (a)    Name (and Type) of Person Filing:  Norman H. Asbjornson (IN)
                    Social Security No. ###-##-####

             (b)    Address of Principal Business Office:

                         2425 South Yukon, Tulsa, Oklahoma 74107.

             (c)    Citizenship:  U.S.

             (d)    Title of Class of Securities: Common Stock, par value $.004

             (e)    CUSIP Number:  000360206


Item 3.      If this statement is filed pursuant to Rule 13d-1(b), or 13d-2(b),
             check whether the person filing is a "person" listed in (a)-(h): No


Item 4.      Ownership

             (a)    Amount Beneficially Owned:  1,126,019

             (b)    Percent of Class:   19.1%

             (c)    Number of shares as to which such person has:

                       (i)   sole power to vote or to direct the vote: 1,126,019

                      (ii)   shared power to vote or to direct the vote:  -0-

                     (iii)   sole power to dispose or to direct the disposition
                             of:  1,126,019

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


Item 5.      Ownership of Five Percent or Less of a Class.  N/A


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


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


Item 8.      Identification and Classification of Members of the Group.  N/A


Item 9.      Notice of Dissolution of Group.  N/A


Item 10.     Certification.  N/A.


                                    SIGNATURE

             After  reasonable  inquiry  and to the  best  of my  knowledge  and
belief,  I certify  that the  information  set forth in this  statement is true,
complete and correct.



                                                  January 18, 2001
                                          ---------------------------------
                                                        Date


                                              /s/ Norman H. Asbjornson
                                          ---------------------------------
                                                      Signature


                                           Norman H. Asbjornson, President
                                          ---------------------------------
                                                      Name/Title