AD Amdt-39-11116
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 747-100 | Airworthiness Directives; Boeing Model 747-100, -200, -300, -SP, and -400F Series Airplanes |
Unsafe Condition
Damage to airframes and property on the ground caused by 'blue ice' forming from leaking lavatory drain systems and dislodging from the airplane fuselage.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Conduct repetitive leak tests of the lavatory drain system and repair as necessary; install a cap or flush/fill line ball valve on the flush/fill line; perform periodic seal changes; replace any 'donut' type valves in the waste drain system.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 50 flight hours after the effective date of the AD.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Boeing Model 747-100, -200, -300, -SP, and -400F series airplanes.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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