Superseded by FAA AD 2021-05-11

Published: Jan 3, 2018
Effective: Jan 3, 2018
Deadline: Jan 3, 2018
Replaces: 2015-08-01

Boeing 757

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

What to do

Operators of affected Boeing 757 airplanes must deactivate the spoiler control module relays and cap and stow the associated wiring as detailed in Boeing Alert Service Bulletin 757-27A0157. The AD became effective on January 3, 2018, and comments were accepted until February 12, 2018. Compliance with these actions is mandatory to maintain airworthiness.

Summary

FAA Airworthiness Directive 2017-26-10 is a final rule affecting certain Boeing Company Model 757 airplanes. It addresses an unsafe condition related to uncommanded spoiler movement during flap configuration just before landing, which was reported on airplanes previously modified under AD 2015-08-01. This directive requires deactivating spoiler control module relays and capping and stowing associated wiring to mitigate this risk.

What changed

This AD supersedes AD 2015-08-01 by removing all its previous requirements and instead mandates deactivation of the spoiler control module relays and proper handling of the associated wiring as specified in Boeing Alert Service Bulletin 757-27A0157. It introduces new corrective actions prompted by a relay failure that caused uncommanded spoiler deployment despite prior modifications.

Why it matters

This directive is critical for aviation professionals because it addresses a safety risk that could lead to loss of lateral control during the approach phase of flight, potentially causing damage or injury. Operators and maintenance teams must implement these changes to ensure continued airworthiness and compliance with FAA safety standards. Failure to comply could result in unsafe flight conditions and regulatory penalties.

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