<PAGE>
 
                                                FILED PURSUANT TO RULE 424(b)(3)
                                                      REGISTRATION NO. 333-23355

                    SUPPLEMENT NO. 4 DATED OCTOBER 8, 1997
                       TO PROSPECTUS DATED JUNE 13, 1997
                   RELATING TO $98,000,000 PRINCIPAL AMOUNT
                6% CONVERTIBLE SUBORDINATED NOTES DUE 2003 AND
        4,286,964 SHARES OF COMMON STOCK, $0.01 PAR VALUE PER SHARE, OF
                           OFFSHORE LOGISTICS, INC.



     In the Prospectus dated June 13, 1997, under the caption "Selling
Securityholders", General Motors Employees Domestic Group Trust is incorrectly
listed as General Electric Employees Domestic Group Trust.



© 2022 IncJournal is not affiliated with or endorsed by the U.S. Securities and Exchange Commission