AD 60-10-05
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
The main float closure port of the fuel tank vent valve may remain closed due to slight pressure in the tank, and the pressure relief poppet in P/N 634056-1 tank vent valves may stick, both occurring at pressures less than the 1.75 p.s.i. setting.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Drill a 1/8-inch hole in the suction relief flapper halfway between the center and the flapper seat, manually check the pressure relief poppet for free action, and complete these actions by the next periodic inspection.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
As soon as possible but no later than the next periodic inspection
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Affected Aircraft
Lockheed Model 188A and 188C aircraft, all serial numbers
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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