COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Cessna 500 (Citation) Series Aeroplanes
AD/CESSNA 500/22 Brake Shuttle Valve 5/90
Applicability: Model 500 and 501 with unit numbers -0001 through -0689 incorporating SB 32-38, BF Goodrich brakes and wheels installation.
Requirement: 1. Inspect in accordance with Cessna Alert Service Letter SLA 500-32-46.
2. Replace brake shuttle valves in accordance with BF Goodrich Service Bulletin SB 517.
Compliance: 1. Within 50 hours time in service after 17 May 1990 and thereafter at intervals not to exceed 50 hours time in service, until BF Goodrich SB 517 is incorporated.
2. Within 200 hours time in service after 17 May 1990.
Background: Reports of leaking shuttle valves have been received by the manufacturer. Leakage has been attributed to slow deterioration of shuttle valve o-ring material as a result of exposure to an incompatible seal lubricant.