AD 47-10-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Aircraft Corporation | 49-46 | LOCKHEED Model 49 |
Unsafe Condition
Fuel tank shutoff and fuel cross transfer valves with Parker 4-1042-11-2 Plug Valves may fail due to worn shaft sealing rings, valve caps, packing caps, cap gaskets, and cap attachment screws, leading to fuel leakage or valve malfunction.
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Required Actions
Rework all fuel tank shutoff and fuel cross transfer valves by installing new type shaft sealing rings, valve caps, packing caps, cap gaskets, and cap attachment screws. This includes valves previously reworked with countersunk head screws with star lock washers or fillister head screws.
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Compliance Time
prior to March 15, 1947
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Affected Aircraft
Lockheed Aircraft Corporation Model 49 serials incorporating Parker 4-1042-11-2 Plug Valves in the fuel system.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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