COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Bell Helicopter Textron 212 Series Helicopters AD/BELL 212/24 Amdt 1 Main Gear Box Spiral Bevel Gear Inspection and Rotor Brake Quill Shaft Removal 1/79 Applicability: All model 212 helicopters. Document: 1. For helicopters fitted with P/N 204-040-701-3 spiral bevel gear - SB 212-78-8, and after any occurrence of torsional overloading, part 1(B) of SB 212-78-12. 2. For helicopters fitted with P/N 204-040-701-101 spiral bevel gear - SB 212-78-12. Compliance: As per the requirement document.