AD 52-26-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sierra Hotel Aero, Inc. | Navion (Army L-17A) | Airworthiness Directives; Navion Applies to All Models, Serial Numbers NAV-4-2 and \\nSubsequent |
| aircraft | Sierra Hotel Aero, Inc. | Navion A (Army L-17B and L-17C) | Airworthiness Directives; Navion Applies to All Models, Serial Numbers NAV-4-2 and \\nSubsequent |
| aircraft | Sierra Hotel Aero, Inc. | Navion B | Airworthiness Directives; Navion Applies to All Models, Serial Numbers NAV-4-2 and \\nSubsequent |
Unsafe Condition
Cracks in the stabilizer spar web (gusset), root rib, and fuselage attaching fitting (P/N 143-31004-13) could lead to structural failure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the stabilizer fuselage attachment area for cracks, focusing on the stabilizer spar web gusset outboard of the root rib and fuselage fitting. Replace fuselage fitting P/N 143-31004-13 if cracks are found. Repair root rib cracks per CAM No. 18 or replace the spar web gusset with a new part per Figure 2. Discontinue inspections after installing new gussets.
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Compliance Time
As soon as practical, but not later than February 1, 1953, and at 100-hour intervals thereafter.
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Affected Aircraft
Sierra Hotel Aero, Inc. Navion models (Army L-17A, Navion A L-17B/C, Navion B), serial numbers NAV-4-2 and subsequent.
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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