AD/CESSNA 550/18 - Brake Shuttle Valve
1AD/CESSNA 550/18 - Brake Shuttle Valve
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COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
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Cessna 550 (Citation II) Series Aeroplanes
AD/CESSNA 550/18 Brake Shuttle Valve 5/90
Applicability: Model 550 and 551 with unit number -0002 through -0619 and -0621 through -0623 equipped with BF Goodrich brakes.
Model S550 with unit number -0001 through -0160 incorporating SB S550-32-7, BF Goodrich brakes and wheels installation.
Requirement: 1. For model 550 and 551:
Inspect in accordance with Cessna alert Service Letter SLA 550-32-38.
For model S550:
Inspect in accordance with Cessna Alert Service Letter SLA S550-32-15.
- 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.
- 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.