AD 47-31-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sierra Hotel Aero, Inc. | Navion (Army L-17A) | Airworthiness Directives; Navion Serial Numbers NAV-4-2 Through NAV-4-1010 Which Incorporate Koehler Model 2250 Fuel Strainers |
Unsafe Condition
Loss of fuel pressure due to air leakage into the fuel system through the CCA-1550-1/8 drain cock on the Koehler Model 2250 fuel strainer.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove the CCA-1550-1/8 drain cock and install the Whittaker Model 7600-1/8 drain cock.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
not later than November 1, 1947
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Affected Aircraft
Navion Serial Numbers NAV-4-2 Through NAV-4-1010 Which Incorporate Koehler Model 2250 Fuel Strainers.
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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