AD 60-20-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Martin Corporation | 188A | LOCKHEED Model 188 Aircraft |
| aircraft | Lockheed Martin Corporation | 188C | LOCKHEED Model 188 Aircraft |
Unsafe Condition
Leaking lavatory tank ground drain valves permit drainage to the exterior surface of the aircraft in flight, resulting in ice formation which can strike the stabilizer and pose a hazard to aircraft in flight and persons on the ground.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Modify lavatory tank ground drain valves to incorporate LAC seal No. 838228-1 or equivalent, as covered by LAC 88/SB-407.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
next 300 hours' time in service after October 28, 1960
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Affected Aircraft
Lockheed Model 188 Aircraft, serial numbers 1002, 1004 through 1102, 1104 through 1126, and 2001 through 2015
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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