AD 2004-06-18
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 737-100 | Airworthiness Directives; Boeing Model 737-100, -200, -300, -400, and -500 Series Airplanes |
Unsafe Condition
Leaking lavatory drain systems can form 'blue ice,' which may dislodge from the fuselage and cause damage to engines, airframes, and ground property.
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Required Actions
Inspect and repair the forward lavatory service system as necessary. Change seals of certain lavatory drain systems periodically. Replace 'donut valves' with FAA-approved valves. Revise leak test intervals and pressurization/fluid level requirements for testing.
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Compliance Time
Before further flight
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Affected Aircraft
Boeing Model 737-100, -200, -300, -400, and -500 series airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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