AD 54-18-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sierra Hotel Aero, Inc. | Navion (Army L-17A) | Airworthiness Directives; All Navion Models |
| aircraft | Sierra Hotel Aero, Inc. | Navion A (Army L-17B and L-17C) | Airworthiness Directives; All Navion Models |
| aircraft | Sierra Hotel Aero, Inc. | Navion B | Airworthiness Directives; All Navion Models |
Unsafe Condition
Relative motion between the wing and fuselage at the wing-to-fuselage attachment due to elongated bolt holes, necessitating additional shear carrying attachment angles.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect for looseness at six bolt locations; ream holes and replace bolts if elongated, install doubler strips on frame 142.57 if aft bolts are loose, and install alclad angles for chordwise shear attachment. Corrective actions must be completed immediately if looseness is found, otherwise by next annual inspection.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
As soon as practicable but not later than October 15, 1954. If no looseness detected, corrective actions may be delayed until the next annual inspection.
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Affected Aircraft
Sierra Hotel Aero, Inc. Navion (Army L-17A), Navion A (Army L-17B and L-17C), Navion B models.
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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