COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Piper PA-23 (Apache and Aztec) Series Aeroplanes
AD/PA-23/41 Auxiliary Front Spar - Inspection 2/71
Applicability: All models.
Requirement: Visually inspect the web of auxiliary front spar P/N 16010 at the outboard end in the area adjacent to rib P/N 16042 (STA 56) for vertical cracks especially near the bend radius.
Compliance: Within 50 hours time in service after 4 January 1971.