AD 46-38-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Grumman American Aviation Corporation | G-21 | Airworthiness Directives; Grumman Model G-21 and G- 21A Aircraft |
| aircraft | Grumman American Aviation Corporation | G-21A (Army OA-9, Navy JRF-1, -2, -3, -4, -5, and -6B) | Airworthiness Directives; Grumman Model G-21 and G- 21A Aircraft |
Unsafe Condition
Raw fuel lodging in the vacuum system check valve, causing valve deterioration and possible fuel seeping.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Reroute vacuum system tubing in engine compartments, inspect flap system storage tank and flush if fuel is present, remove and inspect check valves for wear/deterioration, replace check valves if fuel is found in the storage tank.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
prior to November 1, 1946
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Affected Aircraft
Grumman Model G-21 and G-21A Aircraft (Army OA-9, Navy JRF-1, -2, -3, -4, -5, and -6B)
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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