Water / Waste - Exposed Potable Water Supply Lines - Installation
- Published
- Effective
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Affected operators must comply with the installation requirements specified in Boeing Alert Requirements Bulletin 747-38A2146 RB dated August 7, 2024, by March 21, 2025. This includes installing conduits, envelope assemblies, spray shields, deflector shields, and shrouds on potable water supply lines as applicable to their aircraft configuration. Requests for alternative methods of compliance can be submitted to the FAA following established procedures.
Summary
The Federal Aviation Administration's Airworthiness Directive 2025-03-10 addresses certain Boeing 747-400, 747-400F, 747-8F, and 747-8 series airplanes. It mandates modifications to exposed potable water supply lines to prevent water leaks that could affect critical electronic systems. This directive aims to enhance safety by mitigating risks associated with water intrusion into the main electronics center.
What changed
This new airworthiness directive requires installing protective conduits, envelope assemblies, spray shields, deflector shields, and shrouds on exposed potable water supply lines and fittings in specified locations on affected Boeing 747 models. It introduces these requirements to prevent separation of fittings and water supply tubes that have caused multiple engine and crew alerting system messages during potable water servicing.
Why it matters
This directive is critical for aviation professionals because water leaks into the main electronics center can impair multiple essential electronic components and line replaceable units, potentially compromising safe flight and landing. Operators and maintenance teams must address this unsafe condition promptly to ensure continued airworthiness and avoid operational disruptions.
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