EASA AD US-2022-14-04
Airplane Flight Manual - Certificate Limitations on Minimum Tank Fuel Temperatures - Revision
Summary
The Airplane Flight Manual - Certificate Limitations on Minimum Tank Fuel Temperatures - Revision is a final rule airworthiness directive issued by the FAA affecting certain Boeing 787-8, 787-9, and 787-10 airplanes equipped with Rolls-Royce Deutschland Ltd & Co KG Trent 1000 series engines. It addresses a design issue in the engine fuel feed system that could cause fuel flow restrictions due to ice accumulation and release. The directive mandates updates to the airplane flight manual to revise minimum fuel temperature limitations.
What Changed
This new airworthiness directive requires operators to revise the existing airplane flight manual to incorporate updated limitations on minimum fuel temperatures. It introduces a safety measure to mitigate the risk of fuel flow restrictions caused by ice release in the engine fuel feed system. The directive does not supersede any previous ADs but is considered an interim action pending further software updates from Boeing and Rolls-Royce.
Why It Matters
This directive is critical for aviation professionals as it addresses a potential safety hazard that could lead to loss of dual engine thrust control and reduced airplane controllability. Operators and maintenance teams must ensure compliance to prevent engine fuel flow interruptions caused by ice, thereby maintaining safe flight operations. Compliance also ensures adherence to FAA regulatory requirements and avoids operational disruptions.
What To Do
Affected operators must revise the airplane flight manual within 30 days of the directive's effective date to include the updated minimum fuel temperature limitations. They should monitor for future updates related to electronic engine control software that may further address the issue. Requests for alternative methods of compliance can be submitted to the FAA Seattle ACO Branch as specified.
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