68-10-05\tBOEING: Amendment 39-622. Applies to Model 727 Series airplanes.\n \n\t(a)\tWithin 1600 hours time in service after the effective date of this AD unless already accomplished, modify the thrust reverser deflector doors in accordance with Boeing Service Bulletin No. 78-51, Revision 1, dated April 2, 1968, (or later FAA approved revision). Within 800 hours time in service after the effective date of this AD unless already accomplished, modify the thrust reverser deflector doors in accordance with Boeing Service Letter 6-7132-3375, dated March 1, 1967, (or later revision). \n\n\t(b)\tWithin 3,500 hours time in service after accomplishing the modifications required in (a), and thereafter at intervals not to exceed 3,500 hours time in service, replace bolt P/N BAC- B30EK8-48 or P/N BAC-B30EK8-48C. \n\n\tThis amendment effective May 14, 1968. \n\n\tRevised July 20, 1969.