AD 68-20-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sierra Hotel Aero, Inc. | Navion A (Army L-17B and L-17C) | Airworthiness Directives; Navion Models Navion through Navion H Airplanes |
| aircraft | Sierra Hotel Aero, Inc. | Navion B | Airworthiness Directives; Navion Models Navion through Navion H Airplanes |
| aircraft | Sierra Hotel Aero, Inc. | Navion D | Airworthiness Directives; Navion Models Navion through Navion H Airplanes |
| aircraft | Sierra Hotel Aero, Inc. | Navion E | Airworthiness Directives; Navion Models Navion through Navion H Airplanes |
| aircraft | Sierra Hotel Aero, Inc. | Navion F | Airworthiness Directives; Navion Models Navion through Navion H Airplanes |
| aircraft | Sierra Hotel Aero, Inc. | Navion G | Airworthiness Directives; Navion Models Navion through Navion H Airplanes |
| aircraft | Sierra Hotel Aero, Inc. | Navion H | Airworthiness Directives; Navion Models Navion through Navion H Airplanes |
| aircraft | Sierra Hotel Aero, Inc. | Navion (Army L-17A) | Airworthiness Directives; Navion Models Navion through Navion H Airplanes |
Unsafe Condition
Failure of the Rudder Horn, P/N 145-24401, due to horizontal cracks or corrosion in the edge, which may appear as delaminations or swelling under the paint.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect for horizontal cracks or corrosion in the edge of the rudder horn. Replace corroded or cracked rudder horns with new or unused part of the same part number or FAA approved equivalent part before further flight.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 50 hours time in service after the effective date of this AD, and each annual inspection thereafter
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Navion Models Navion through Navion H Airplanes manufactured by Sierra Hotel Aero, Inc., including Navion A (Army L-17B and L-17C), Navion B, Navion D, Navion E, Navion F, Navion G, and Navion H.
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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