COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Boeing 727 Series Aeroplanes AD/B727/48 Stabilizer Trim System Brake Assembly - Modification 5/67 Applicability: All models. Requirement: Install additional spacers under pawls in the stabilizer trim system brake, Boeing P/N 10-60822-1, Western Gear P/N 4472, R155, Western Gear S/Nos. 101 through 225, in accordance with para. 2 of Western Gear SB "Flight Controls - Stabilizer Brake Assembly, Western Gear P/No. 4472 R155 Install Additional Spacers Under Pawls".