COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Cessna 150, F150, 152 & F152 Series Aeroplanes AD/CESSNA 150/2 Amdt 1 Main Undercarriage "U" Bolts 11/67 Applicability: All models fitted with "U" bolts P/N 0441161 types. Requirement: 1. Visual: Inspect the main undercarriage "U" bolts P/N 0441161 in situ for cracks and other damage and check that the "U" bolt retaining nuts are torqued to the values specified in the Cessna Service Manual. 2. Magnetic Particle: Remove the main undercarriage "U" bolts P/N 0441161 and inspect by the magnetic particle method for cracks particularly in the radius of the bends and in the root of the threads. Compliance: Visual: At intervals not exceeding 100 hours time in service. Magnetic Particle: At intervals not exceeding 500 hours time in service.