Airworthiness DirectiveEASA AD US-2022-23-10

Water / Waste - Potable Water System - Deactivation / Modification

Published: Jan 3, 2023
Effective: Jan 4, 2023
Deadline: Jan 4, 2023
Replaces: 2021-06-03

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

What to do

Operators of Boeing 777F series airplanes must deactivate the potable water system by January 4, 2023, install shrouds on water supply and return lines as specified, replace certain tubes and hoses where applicable, and conduct leak tests of the potable water system. They should also review Boeing Alert Requirements Bulletin 777-38A0048 RB dated October 18, 2021, and Boeing Alert Service Bulletin 777-38A0047 dated March 30, 2021, for detailed procedures. Compliance with these actions is mandatory to address the unsafe condition.

Summary

Airworthiness Directive 2022-23-10 is a final rule issued by the Federal Aviation Administration affecting all Boeing 777F series airplanes. It addresses unsafe conditions related to the potable water system, specifically water supply line detachment above an electronic equipment cooling filter that can cause water intrusion into the forward electronic equipment bay. This directive requires deactivating the potable water system, installing protective shrouds on water supply and return lines, and performing leak tests to prevent water damage to critical electrical systems.

What changed

This directive supersedes AD 2021-06-03 and retains its requirements while adding new actions including installing a shroud on the water supply line in the forward cargo compartment and performing potable water system leak tests. For certain airplanes, it also mandates replacing tubes and hoses from the water supply line and installing a shroud on the water return line. Additionally, it incorporates provisions for an optional interim action allowing temporary activation of the potable water system under specific conditions.

Why it matters

This AD is critical for aviation professionals because water intrusion into electronic equipment bays can cause loss of functionality or inaccurate outputs from essential electrical systems, potentially leading to loss of airplane control. Operators and maintenance teams must comply to ensure continued airworthiness and safety of Boeing 777F aircraft. The directive also clarifies compliance scope and timelines, helping avoid operational disruptions or grounding of affected airplanes.

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