Superseded. This AD was superseded by AD 2021-23-17. Verify which one applies to your serial and effectivity before any maintenance action.
AD 2020-25-05
Effective 12/22/2020 · Published 12/07/2020
Airworthiness Directives; Hoffmann GmbH & Co. KG Propellers
Summary
The FAA is adopting a new airworthiness directive (AD) for all Hoffmann GmbH & Co. KG (Hoffmann) model HO-V 72 propellers. This AD was prompted by reports of cracks at different positions on two affected propeller hubs. This AD requires amending the existing aircraft flight manual (AFM) with abnormal propeller vibration instructions. This AD requires visual inspection and non-destructive test (NDT) inspection of the…