AD 47-21-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sierra Hotel Aero, Inc. | Navion (Army L-17A) | Airworthiness Directives; Navion Serial Numbers NAV-4-2 Through 21, 24 Through 29, 32, 35, 36, 40, 42 Through 47, 57, 192, 199, 251. |
Unsafe Condition
The original fuel filler scupper collects spilled gasoline due to lack of a drain line and has insufficient material thickness to prevent damage from the filler hose nozzle.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Install a redesigned scupper with drain line per NAA Drawing 145-89010.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
not later than August 1, 1947
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Sierra Hotel Aero, Inc. Navion (Army L-17A) serial numbers NAV-4-2 Through 21, 24 Through 29, 32, 35, 36, 40, 42 Through 47, 57, 192, 199, 251.
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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