AD 48-06-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sierra Hotel Aero, Inc. | Navion (Army L-17A) | Airworthiness Directives; All Navion Models Equipped With Hartzell Propeller Blade Models 8428, 8428C, 8428R Having Serial Numbers Below 61000 |
Unsafe Condition
Fillers used in Hartzell Propeller Blade Models 8428, 8428C, 8428R with serial numbers below 61000 may be discernible to the naked eye in the area approximately 4 inches outboard of the blade clamp, indicating potential defects that could compromise structural integrity.
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Required Actions
Inspect blades in bright daylight or strong artificial light for fillers; remove paint and fillers if found, repair defects by forming a shallow saucer-shaped removal (max 1/8 inch deep, 3/8 inch wide, 1 inch long), repaint and rebalance propeller. Unrepairable defects require return to manufacturer and logbook documentation.
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Compliance Time
Compliance required by April 15, 1948.
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Affected Aircraft
Sierra Hotel Aero, Inc. Navion (Army L-17A) models equipped with Hartzell Propeller Blade Models 8428, 8428C, 8428R having serial numbers below 61000.
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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