AD 53-09-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Continental | W-670-9A | CONTINENTAL Model W-670-9A Engines |
Unsafe Condition
Propeller blade fatigue failures due to lack of suitable propeller vibration stress data.
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Required Actions
Disassemble and inspect blades for cracks via shank area etching under hub clamp rings. Cut propeller diameter between 102 inches maximum and 100 inches minimum. Set blade angle for static r.p.m. between 1,500 and 1,975. Install propeller in zero degree position. Placard aircraft with rpm restriction. Remove tip region nicks/gouges and maintain per CAM 18.
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Compliance Time
not later than May 15, 1953
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Affected Aircraft
All aircraft with Continental W-670-9A engines and ground adjustable propellers with blades 11C1 (Hamilton Standard) or 4350, 4350F, 4350F1 (Navy model designations).
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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