COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Piper PA-30 & 39 (Twin Comanche) Series Aeroplanes AD/PA-30/4 Auto-Pilot Pitch Servo Motor - Modification 7/65 Applicability: All models fitted with Mitchell Altimatic 2 Auto-Pilot. Document: 1. Piper SB No. 224; and 2. Mitchell SB No. A55. Compliance: Forthwith.