AD 47-10-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Aircraft Corporation | 49-46 | LOCKHEED Model 49 |
Unsafe Condition
The Fenwall Type S-2223 fire detector units may fail to detect fires in fire seals, firewalls, nacelles, and cabin heater compartments.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace all Fenwall Type S-2223 fire detector units with Type 17343-3-450 units, installing 100 units per Model 49-51 aircraft and 116 units per Model 49-46 aircraft.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
not later than 200 hours of operation after March 1, 1947
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Affected Aircraft
Lockheed Aircraft Corporation Model 49-46 and 49-51 serial numbers up to and including 2088.
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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