COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Aerostar (Piper/Ted Smith) 600 and 700 Series Aeroplanes AD/TSA-600/22 Cabin Door Upper Section - Modification 11/79 Applicability: All model 600 with S/Nos. 60-0001 to 60-0056; and All model 601 with S/Nos. 61- 0001 to 61-0070. Requirement: Install in the cabin door upper section latching mechanism, spacers and the locking position visual indicators in accordance with Aerostar SB No. 600-35. Note: FAA AD 79-18-10, Amdt. 39-3535 refers. Compliance: Unless already accomplished, within 100 hours time in service after 30 November 1979. Background: This Directive adds the modification action of Aerostar SB 600-35 to prevent inflight loss of the cabin upper door section.