AD 57-13-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Hamilton Standard | Propeller Blades | HAMILTON STANDARD Applies to All Hamilton Standard Aluminum Alloy Blades Used in Hydromatic (Noncounterweight Type) Propellers |
Unsafe Condition
Severe corrosion in the seal area at the shank of blades not incorporating a corrosion barrier, as evidenced by a failed blade that did not have the recommended corrosion barriers from Service Bulletins 390 and 414A.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect shank area for corrosion at each blade removal after December 1, 1957. Install corrosion barrier unless corrosion is found, in which case rework shank area per Service Bulletin 508. Remove blades reworked below minimum shank diameters.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
At each removal of propeller blade from hub after December 1, 1957, and prior to September 1, 1957, or 450 hours of operating time after July 1, 1957, whichever comes first for blades on P&W R2800 'B' type engines in C-46 aircraft.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Hamilton Standard Aluminum Alloy Blades in Hydromatic (Noncounterweight Type) Propellers, excluding blades with integrally molded chafing rings or those with corrosion barriers from Service Bulletins 390, 414, 414A in good condition.
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
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.