AD 2020-12-07
Unsafe Condition
Corrosion pitting and resultant intergranular radial crack in the propeller blade taper bore, which can lead to fatigue crack initiation and growth under service loading, resulting in blade separation and loss of the airplane.
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Required Actions
Initial and repetitive eddy current inspections (ECIs) of the affected propeller blades, and replacement of the propeller blades that fail the inspection.
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Compliance Time
Within 12 months of the effective date of this AD.
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Affected Aircraft
Hamilton Sundstrand Corporation 54H60 model propellers with blade serial numbers below 813320, manufactured before 1971.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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