AD 2000-04-10
Unsafe Condition
Insufficient torque of propeller mounting bolts due to operating conditions, loads, and environmental conditions such as humidity and temperature, which could lead to propeller mounting bolt failure and subsequent propeller separation.
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Required Actions
Install improved propeller mounting bolts to a higher torque value, operate the airplane for one flight, check the torque, and retorque as required to the correct torque value.
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Compliance Time
Before further flight.
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Affected Aircraft
Hoffmann Propeller Co. HO27( ) and HO4/27 series propellers.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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