AD 47-10-19
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Aircraft Corporation | 49-46 | LOCKHEED Model 49 |
Unsafe Condition
The cabin heater fuel solenoid valve and fuel pump bypass line may be improperly located or routed, leading to potential fuel leakage or electrical short circuits. Additionally, the absence of heat protective shields in nacelle zone 2, improper mounting hardware in nacelle junction boxes, and lack of drain holes in spinner fairings may cause overheating, component failure, or moisture ingress.
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Required Actions
Relocate and waterproof the cabin heater fuel solenoid valve, replace and reroute the fuel pump bypass line, install heat protective shields in nacelle zone 2, replace mounting nuts and screws with AN 366 and NAS 221 hardware, and drill 1/4-inch drain holes in spinner fairing lower panels.
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Compliance Time
not later than 100 hours of operation after June 10, 1947
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Affected Aircraft
Lockheed Aircraft Corporation Model 49 serials up to and including 2088, except as noted. Specific requirements for serials up to 2082 for heat shields and all applicable serials for other modifications.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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