Superseded by FAA AD 2022-23-10

Published: Mar 9, 2021
Effective: Mar 5, 2021
Deadline: Mar 5, 2021

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

What to do

Operators of Boeing 777F airplanes must deactivate the potable water system as specified in Boeing MOM-MOM-21-0089-01B. Compliance with this directive is required by March 5, 2021. Comments on the AD are invited until April 19, 2021, but the rule is effective immediately due to safety concerns.

Summary

FAA Airworthiness Directive 2021-06-03 is a final rule affecting all Boeing 777F series airplanes. It addresses a safety issue where a water supply line joint above an electronic equipment cooling filter can detach, causing water intrusion into the forward electronic equipment bay. This AD requires deactivation of the potable water system to mitigate the risk.

What changed

This new airworthiness directive introduces a mandatory requirement to deactivate the potable water system on all Boeing 777F airplanes due to the risk of water ingress damaging critical electronic equipment. It prohibits future installation of a specific joint configuration and supersedes prior optional service bulletin retrofits.

Why it matters

This AD is critical for aviation professionals as water intrusion into electronic equipment bays can lead to loss of functionality or inaccurate outputs from essential electrical systems, potentially resulting in loss of airplane control. Operators and maintenance teams must address this unsafe condition promptly to ensure continued airworthiness and safety compliance.

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