AD 2022-08-10
Unsafe Condition
The separation of a 54H60 model propeller blade installed on a USMCR KC-130T airplane during a flight in July 2017, resulting in the loss of the airplane and 17 fatalities, revealed that 54H60 model propeller blades manufactured before 1971 are susceptible to cracks of the propeller blade in the area of the internal taper bore.
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Required Actions
Initial and repetitive eddy current inspections (ECI) of all propeller blades installed on Hamilton Sundstrand 54H60 propeller hubs and replacement of any propeller blade that fails inspection.
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Compliance Time
Before further flight
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Affected Aircraft
Hamilton Sundstrand 54H model propellers with a 54H60 model propeller hub, including propeller blades with a blade serial number (S/N) below 813320, all propeller blades if the propeller contains a propeller blade with a blade S/N below 813320, and all propeller blades that have not been overhauled within ten years.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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