AD 2015-08-51
Unsafe Condition
Cracks in the main rotor spindle, which can lead to main rotor blade separation and subsequent loss of control of the helicopter.
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Required Actions
Conduct a magnetic particle inspection (MPI) on any spindle with 1,500 or more hours time-in-service (TIS) or where TIS is unknown. Replace the spindle if a crack is found before further flight. Report inspection results to the FAA within 72 hours.
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Compliance Time
Before further flight
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Affected Aircraft
Enstrom Helicopter Corporation Model F-28A, 280, F-28C, F-28C-2, F-28C-2R, 280C, F-28F, F-28F-R, 280F, 280FX, and 480 helicopters with main rotor spindles, part numbers 28-14282-11 and 28-14282-13.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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