AD 2022-21-13
Unsafe Condition
Cracks have been reported at different positions on two affected propeller hubs, likely resulting from improper tightening of blade nuts.
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Required Actions
Inspect the propeller blade for shake, tighten each propeller blade retention nut to specified torque values, and depending on the results of the maintenance records review, replace the propeller hub with a part eligible for installation.
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Compliance Time
Within 50 flight hours
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Affected Aircraft
Hoffmann GmbH & Co. KG model HO-V 72 propellers installed on Slingsby T67 Firefly aeroplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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