AD 2010-14-20
Unsafe Condition
Reports of 10 hubs found cracked during propeller overhaul indicate a potential failure of the propeller hub, which could cause blade separation, damage to the airplane, and loss of control of the airplane.
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Required Actions
Remove and disassemble the propeller, etch the hub, perform a one-time fluorescent penetrant inspection (FPI), and for passing hubs, conduct a one-time eddy current inspection (ECI). Remove cracked hubs and any other cracked propeller parts from service.
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Compliance Time
Within 100 operating hours time-in-service after the effective date for hubs with 6,000 or more operating hours TSN, or before the hub reaches 6,100 operating hours TSN for hubs with fewer than 6,000 operating hours TSN.
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Affected Aircraft
McCauley Propeller Systems model 4HFR34C653/L106FA propellers.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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