Airworthiness directives › 2021-23-17
AD 2021-23-17 Airworthiness Directives; Hoffmann GmbH & Co. KG Propellers
Applicability*9
This AD applies to all Hoffmann GmbH & Co. KG model HO-V 72 propellers.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) Before the next flight after December 22, 2020 (the effective date of AD 2020-25-05), amend the existing aircraft flight manual by inserting the procedure: “Abnormal propeller vibrations: As applicable, reduce engine RPM.” (2) Before the next flight after the effective date of this AD, and thereafter, before the next flight after any flight where abnormal propeller vibrations have been experienced, visually inspect propeller hub HO-V 72 ( ) ( )-( )-( ) for cracks using paragraph 2.1 of Hoffmann Propeller GmbH & Co. KG Service Bulletin SB E53, Rev. D, dated February 18, 2021 (the SB). (3) Within 20 flight hours after the effective date of this AD, perform a non-destructive test (NDT) inspection of propeller hub HO-V 72 ( ) ( )-( )-( ) using paragraph 2.3 of the SB. (4) During each overhaul of propeller hub HO-V 72 ( ) ( )-( )-( ) after the effective date of this AD, perform an NDT inspection using paragraph 2.3 of the SB. (5) If, during any inspection required by paragraph (g)(2), (3), or (4) of this AD, any crack is detected, replace propeller hub HO-V 72 ( ) ( )-( )-( ) with a part eligible for installation.
Unsafe condition
This AD was prompted by reports of cracks at different positions on two affected propeller hubs. The FAA is issuing this AD to prevent failure of the propeller hub. The unsafe condition, if not addressed, could result in release of the propeller, damage to the airplane, and injury to persons on the ground.
Affected ADs
This AD replaces AD 2020-25-05, Amendment 39-21347 (85 FR 78702, December 7, 2020).
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