AD 2004-15-13
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | McDonnell Douglas | Various | Airworthiness Directives; McDonnell Douglas Model DC-9-81 (MD-81), DC-9-82 (MD-82), DC-9-83 (MD-83), DC-9-87 (MD-87), and Model MD-88 Airplanes |
Unsafe Condition
Failure of freeze protection ribbon heaters in the lavatory water supply system, which could result in charring, scorching, smoking, shorting out, and electrical arcing, leading to fire and damage to water lines and components under the lavatory sink.
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Required Actions
Replace certain freeze protection ribbon heaters with a new, reidentified heater hose assembly and flush, clean, and sterilize the potable water system; or disconnect, coil, and stow the wiring of the freeze protection ribbon heater; or remove the freeze protection ribbon heater.
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Compliance Time
Before further flight
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Affected Aircraft
McDonnell Douglas Model DC-9-81 (MD-81), DC-9-82 (MD-82), DC-9-83 (MD-83), DC-9-87 (MD-87), and Model MD-88 airplanes, as listed in Boeing Alert Service Bulletin MD80-25A381.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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