Airworthiness DirectiveEASA AD US-2022-06-10

Exhaust - Thrust Reverser Inner Wall Debris Shields - Installation // Powerplant - Fan Cowl Doors / Hydraulic Pump Shutoff Valves - Inspection / Functional Check

Published: Mar 25, 2022
Effective: Apr 15, 2022
Deadline: Apr 15, 2022

Boeing 777 200 300

AI-generated summary of the official EASA document. Verify against the PDF before acting.

What to do

Operators must install the required debris shields, inspect fan cowl doors for moisture ingress, and conduct functional checks of hydraulic pump shutoff valves before further flight after April 15, 2022. Repetitive functional checks must be performed within 10 days prior to each flight. Stakeholders should use FAA-approved service bulletins and follow the specified compliance procedures to meet the directive's requirements.

Summary

Federal Aviation Administration Airworthiness Directive 2022-06-10 is a final rule addressing certain Boeing 777-200 and 777-300 series airplanes equipped with Pratt & Whitney engines. It mandates the installation of debris shields on the thrust reverser inner wall, inspection of fan cowl doors for moisture ingress, and repetitive functional checks of hydraulic pump shutoff valves to prevent unsafe conditions related to in-flight fan blade failures. This directive aims to mitigate risks of engine shutdown, uncontrolled fires, and structural damage.

What changed

This new airworthiness directive introduces requirements for installing debris shields on the thrust reverser inner wall, inspecting fan cowl doors for moisture, and performing repetitive functional checks on hydraulic pump shutoff valves. It also clarifies acceptable service information for compliance and addresses comments from stakeholders regarding operational exceptions and inspection procedures.

Why it matters

This directive is critical for operators and maintenance organizations to prevent engine failures that could lead to severe safety hazards such as engine fire, loss of control, or forced landings. Compliance ensures continued airworthiness and safety of Boeing 777 aircraft with affected Pratt & Whitney engines, especially during extended operations. It also helps avoid potential damage to aircraft structures and passenger injury.

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