EASA AD US-2019-10-06
Fuel - Fuel Vent Check Valve - Replacement / Airplane Flight Manual Revision
Summary
Federal Aviation Administration Airworthiness Directive 2019-10-06 is a final rule addressing certain Aviat Aircraft Inc. Models A-1C-180 and A-1C-200 airplanes equipped with Rapco part number RA1798-00-1 fuel vent check valves. The directive requires revising the airplane flight manual to include a pre-flight check of these fuel vent check valves and mandates replacing any inoperative valves with Aviat part number 38266-501 valves. This AD aims to prevent fuel starvation caused by fuel vent check valves sticking in the closed position.
What Changed
This new airworthiness directive introduces a requirement to revise the airplane flight manual to add a pre-flight check of the fuel vent check valves for proper operation. It replaces the previously proposed replacement valve from Dukes with an Aviat-designed valve due to compatibility issues. The AD also updates cost estimates and clarifies maintenance and record-keeping procedures related to the valve replacement.
Why It Matters
This AD is critical for aviation professionals as it addresses a safety risk of engine fuel starvation caused by malfunctioning fuel vent check valves. Operators and maintenance personnel must ensure compliance to maintain airworthiness and prevent in-flight engine power loss. The directive impacts pre-flight inspection routines and maintenance actions, requiring updated procedures and documentation.
What To Do
Affected operators must revise the airplane flight manual by July 22, 2019, to include a pre-flight check of the fuel vent check valves. Any inoperative Rapco RA1798-00-1 fuel vent check valve must be replaced with an Aviat P/N 38266-501 valve. Operators may remove the AFM revisions if both Rapco valves are replaced. Compliance with these actions is mandatory by the effective date.
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