Airworthiness DirectiveEASA AD US-2021-24-14

Engine Exhaust - Thrust Reverser Translating Sleeve Secondary Sliders - Check / Replacement

Published: Jan 12, 2022
Effective: Feb 15, 2022
Deadline: Feb 15, 2022

Boeing 787 8 9 10

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

What to do

Operators of affected Boeing 787-8, 787-9, and 787-10 airplanes with Rolls-Royce Trent 1000 engines must determine the serial number of the thrust reverser translating sleeves and perform required inspections and on-condition actions as specified in Boeing Alert Requirements Bulletin B787-81205-SB780043-00 RB. If damage is found, repairs or replacement with a serviceable thrust reverser must be completed. All actions must be done by February 15, 2022, the effective date of the directive.

Summary

The Federal Aviation Administration Airworthiness Directive 2021-24-14 is a final rule addressing certain Boeing 787-8, 787-9, and 787-10 airplanes powered by Rolls-Royce Trent 1000 engines. It targets damage found in the thrust reverser translating sleeve secondary sliders caused by contact with the slider track liner, which could reduce the fatigue life of these components. This directive mandates inspections and possible replacement of affected thrust reversers to ensure continued airworthiness.

What changed

This new airworthiness directive introduces mandatory actions including determining the serial number of the thrust reverser, performing detailed inspections for damage such as cracking, grooving, or gouging, and carrying out repairs or replacements as necessary. It clarifies that the unsafe condition primarily affects thrust reversers installed on Rolls-Royce engines with mission improvement translating sleeves. The directive also incorporates Boeing Alert Requirements Bulletin B787-81205-SB780043-00 RB as the service information for compliance.

Why it matters

This directive is critical for aviation professionals because damage to the thrust reverser translating sleeve secondary sliders can lead to failure of the slider and possible detachment of the outer cowl, which poses a safety risk by potentially striking the fuselage and degrading aircraft control or performance. Operators and maintenance organizations must address this issue promptly to maintain aircraft safety and regulatory compliance. Failure to comply could result in unsafe flight conditions and regulatory penalties.

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