COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 107 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Instruments and Automatic Pilots
AD/INST/28 A.R.C. PA1050A Actuator and DA-1050A Decoupler Adapter - Cessna 1050A I.F.C.S. - Inspection and
Modification
11/79
Applicability: All PA-1050A actuators ARC P/N 46220-2900 S/Nos. 001 to 599 not incorporating Mod. 2 and all DA-1050A decoupler adapters ARC P/N 47720-0000 S/Nos. 001 to 389 not incorporating Mod. 1 and Mod. 3.
Document: 1. ARC Field Engineering SB No. 215; or
2. Cessna Information Letter AV79-26 (Cessna 441 aircraft).
Compliance: 1. Inspection - At intervals not exceeding 100 hours time in service until modified.
2. Modification - Before 30 November 1980.
Background: Actuators and decoupler adapters of ARC IF 1050A (Cessna 1050A) flight control system have corroded and failed due to inadequate protection from water.
Modifications to these units will improve their corrosion resistance.