EASA AD US-2022-06-11: Nacelles / Pylons - Engine Inlet - Modification

What to do

Operators of affected Boeing 777-200 and 777-300 series airplanes must modify the engine inlet by April 15, 2022, to comply with this directive. They should follow FAA-approved service information and perform required ultrasonic inspections before any further flight unless operating under a special flight permit. Maintenance teams must also conduct functional checks of hydraulic pump shutoff valves as specified.

Summary

Federal Aviation Administration Airworthiness Directive 2022-06-11 is a final rule addressing certain Boeing 777-200 and 777-300 series airplanes equipped with specific Pratt & Whitney engines. It mandates modifications to the engine inlet to withstand loads from potential in-flight fan blade failures, which have been reported in three incidents. This directive aims to mitigate risks of engine shutdown, inlet separation, uncontrolled fires, and consequent loss of airplane control.

What changed

This new airworthiness directive introduces a requirement to modify the engine inlet structure on affected Boeing 777 aircraft to better contain fan blade failure events. It also establishes inspection thresholds and special flight permit provisions for ferry flights. The directive clarifies compliance methods and rejects the use of certain Boeing service bulletins until FAA approval is granted.

Why it matters

This directive is critical for operators and maintenance organizations to prevent catastrophic engine damage and potential loss of aircraft control due to fan blade failures. Compliance ensures enhanced safety by reducing the risk of inlet separation and uncontrolled engine fires. It also provides clear guidance on inspection intervals and special flight permits, aiding regulatory compliance and operational planning.

What to do

Summary

What changed

Why it matters

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