Superseded by FAA AD 2025-21-02

Published: Aug 12, 2022
Effective: Aug 18, 2022
Deadline: Aug 18, 2022

Boeing 777

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

What to do

Operators of Boeing 777 airplanes must disconnect, cap, and stow the wires connected to the affected transorb modules by August 18, 2022. Maintenance personnel should follow the specified procedures to disable the gust suppression sensor transorb modules. Comments on the AD are invited until September 19, 2022, but compliance is mandatory by the effective date.

Summary

FAA Airworthiness Directive 2022-15-06 is a final rule applicable to all Boeing Model 777 airplanes. It addresses an unsafe condition caused by high electrical resistance due to corrosion in gust suppression sensor transorb modules. This condition can expose flight control electronics to damaging lightning voltages, potentially leading to loss of airplane control.

What changed

This new airworthiness directive requires disconnecting the connectors from affected transorb modules and capping and stowing the associated wires. It disables the gust suppression function, which is a non-essential feature, to mitigate the risk until a permanent modification is developed. The AD is issued as an interim action with potential for further rulemaking once a fix is available.

Why it matters

This AD is critical for aviation professionals because it prevents latent electrical failures that could cause erroneous flight control surface movements and loss of control. Operators and maintenance teams must address this issue promptly to ensure continued airworthiness and safety. Compliance avoids exposure of actuator control electronics to damaging lightning transient voltages.

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