AD 2001-23-08
Unsafe Condition
Cracks in the propeller hub fillet radius can lead to blade separation and subsequent loss of aircraft control.
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Required Actions
Initial and repetitive eddy current inspections (ECI) of the propeller hub fillet radius for cracks are required. Certain model propeller hubs must be removed from service. Installation of an improved design propeller hub is allowed as a terminating action to the repetitive ECI.
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Compliance Time
Within 150 flight hours after the effective date.
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Affected Aircraft
Hartzell Propeller Inc. ( )HC-( )2Y( )-( ) propellers installed on Britten Norman or Pilatus Britten Norman BN-2 series aircraft with a Textron Lycoming 540 series engine, as well as aircraft certificated in the acrobatic category or used for agricultural purposes.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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