COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Piper PA-31 Series Aeroplanes AD/PA-31/80 Elevator Control Stop - Inspection 6/79 Applicability: All models PA-31, PA-31-300 and PA-31-325 with S/Nos. 31-5 to 31-7912049. All model PA-31-350 with S/Nos. 31-5001 to 31-7952091. Document: Piper SB No. 649. Compliance: Within the next 100 hours time in service after 30 June 1979. Background: An incident has been reported to the manufacturer of an elevator control stop adjusting screw and locknut being loose and backing out resulting in restriction of elevator control travel.