PAM TRANSPORTATION SERVICES INC
SC 13G/A, 1997-02-07
TRUCKING (NO LOCAL)
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<PAGE>   1
                                                             OMB APPROVAL
                                                      --------------------------
                                                          OMB No. 3235-0145
                                                      Expires September 30, 1988
                                                      --------------------------





                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                  SCHEDULE 13G

                    Under the Securities Exchange Act of 1934
                               (Amendment No. 3)*


                      P.A.M. Transportation Services, Inc.
       -----------------------------------------------------------------
                                (Name of Issuer)

                           $.01 par value Common Stock
       -----------------------------------------------------------------
                         (Title of Class of Securities)

                                    693149106
               --------------------------------------------------
                                 (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).


                      (Continued on the following page(s))



                                Page 1 of 5 Pages
<PAGE>   2
<TABLE>
<CAPTION>
- ------------------------------                          ------------------------

CUSIP No.    693149106                13G                  Page 2 of 5 Pages
          --------------
- ------------------------------                          ------------------------

- --------------------------------------------------------------------------------
<S>      <C>
  1      NAME OF REPORTING PERSON
         S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                 Robert W. Weaver

- --------------------------------------------------------------------------------
  2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                      (a) [ ]
                                                                      (b) [ ]

- --------------------------------------------------------------------------------
  3      SEC USE ONLY



- --------------------------------------------------------------------------------
  4      CITIZENSHIP OR PLACE OF ORGANIZATION

                 United States

- --------------------------------------------------------------------------------
                     5      SOLE VOTING POWER

  NUMBER OF                       622,428

   SHARES        ---------------------------------------------------------------
                     6      SHARED VOTING POWER
BENEFICIALLY
                                  -0-
  OWNED BY
                 ---------------------------------------------------------------
   EACH              7      SOLE DISPOSITIVE POWER

REPORTING                         622,428

 PERSON          ---------------------------------------------------------------
                     8      SHARED DISPOSITIVE POWER
  WITH
                                  -0-

- --------------------------------------------------------------------------------
  9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON


                 622,428

- --------------------------------------------------------------------------------
 10      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 9 EXCLUDES 
         CERTAIN SHARES*                                                  [ ]

- --------------------------------------------------------------------------------
 11      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                 7.6%

- --------------------------------------------------------------------------------
 12      TYPE OF REPORTING PERSON*

                 IN
- --------------------------------------------------------------------------------
</TABLE>


                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>   3
Item 1(a).     Name of Issuer.

               P.A.M. Transportation Services, Inc.

Item 1(b).     Address of Issuer's Principal Executive Offices.

               Highway 412 West, P.O. Box 188, Tontitown, Arkansas 72770

Item 2(a).     Name of Person Filing.

               Robert W. Weaver

Item 2(b).     Address of Principal Business Office or, if none, Residence.

               Highway 412 West, P.O. Box 188, Tontitown, Arkansas 72770

Item 2(c).     Citizenship.

               United States

Item 2(d).     Title of Class of Securities.

               $.01 par value Common Stock

Item 2(e).     CUSIP Number.

               693149106

Item 3.        If this statement is filed pursuant to Rule 13d-1(b), or
               13d-2(b), check whether the person filing is a:

               Not Applicable

Item 4(a).     Amount Beneficially Owned as of December 31, 1996.

               622,428 shares of Common Stock, including 35,000 shares subject
               to presently exercisable stock options.

Item 4(b).     Percent of Class.

               7.6%

Item 4(c).     Number of Shares as to Which Such Person has Sole or Shared 
               Voting and Dispositive Power.

               Mr. Weaver has both sole voting power and sole dispositive power
               with respect to all 622,428 shares of Common Stock which he
               beneficially owns.


                                Page 3 of 5 Pages
<PAGE>   4
Item 5.        Ownership of Five Percent or Less of a Class.

               Not Applicable

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

               Not Applicable

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 and Classification of Members of the Group.

               Not Applicable

Item 9.        Notice of Dissolution of Group.

               Not Applicable

Item 10.       Certification.

               Not Applicable




                                Page 4 of 5 Pages
<PAGE>   5
                                    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.



Date:  February 7, 1997                  /s/ Robert W. Weaver
     ----------------------             ---------------------------------------
                                        Robert W. Weaver




                                Page 5 of 5 Pages


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