AD 47-10-22
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Aircraft Corporation | 49-46 | LOCKHEED Model 49 |
Unsafe Condition
The aluminum alloy retainer washer on the fire extinguisher selector valve may fail due to corrosion or deformation, leading to potential fire extinguisher system malfunction.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Install steel retainer washer (American LaFranch P/N 2CD-3054C) in place of the existing aluminum alloy retainer washer on the fire extinguisher selector valve.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
prior to March 1, 1947
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Affected Aircraft
Lockheed Aircraft Corporation Model 49-46, serial numbers 1975, 1976, 1977, and 2021 through 2065.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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