COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Piper PA-34 (Seneca) Series Aeroplanes AD/PA-34/3 Amdt 1 Induction Air Box Valve - Inspection 9/72 Applicability: Model PA34-200 with S/Nos. 34-E4 and 34-7250001 to 34-7250360 and 34-7350001 to 34-7350074 not modified in accordance with Piper SB No. 374. Document: Piper SB No. 358. Compliance: Within 100 hours time in service after 29 September 1972 and there-after at intervals not exceeding 100 hours time in service.