COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES British Aerospace (Scottish Aviation) Twin Pioneer Series Aeroplanes AD/SA-TP/9 Slat Jack P/N 4694 - Replacement with P/N 4477 NK Applicability: S/No. 507 and subsequent. Document: Scottish Aviation Mod. No. C403. Compliance: Forthwith.