AD 50-12-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Hamilton Standard | Teledyne Continental Motors | Propeller Blades | HAMILTON STANDARD Ground Adjustable Propellers Having Blades, Model 11C1 |
| aircraft | Hamilton Standard | Teledyne Continental Motors | W670-16 | HAMILTON STANDARD Ground Adjustable Propellers Having Blades, Model 11C1 |
| aircraft | Hamilton Standard | Teledyne Continental Motors | W670-6A | HAMILTON STANDARD Ground Adjustable Propellers Having Blades, Model 11C1 |
| aircraft | Hamilton Standard | Teledyne Continental Motors | W670-6N | HAMILTON STANDARD Ground Adjustable Propellers Having Blades, Model 11C1 |
Unsafe Condition
Propeller blade shank fatigue failures as a result of noncompliance with a mandatory engine operation restriction.
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Required Actions
Check and correctly mark the engine tachometer with a red arc above 1,900 r.p.m., install a placard to avoid engine operation above 1,900 r.p.m. except during takeoff, and check and index the propeller position to the zero degree position.
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Compliance Time
not later than April 15, 1950
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Affected Aircraft
Hamilton Standard Ground Adjustable Propellers with blades Model 11C1 installed on aircraft equipped with Continental Engines Models W-670-6A, W-670-6N, or W-670-16.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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