Airworthiness directives › 2021-22-20
AD 2021-22-20 Airworthiness Directives; Austro Engine GmbH Engines
Makes named: austro. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to Austro Engine GmbH E4 and E4P model diesel piston engines equipped with either: (1) A cylinder head having part number (P/N) E4A-12-500-000 (affected cylinder head), or (2) A high-pressure pump (HPP) driving gear, having P/N E4A-30-000-201, with a serial number (S/N) listed in Chapter 1.4, Table 1 of Austro Engine Mandatory Service Bulletin No. MSB-E4-034/3, Revision No. 3, dated September 30, 2021 (MSB-E4-034/3) (affected HPP driving gear).
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) For engines with an affected cylinder head, before further flight after the effective date of this AD, perform all actions in the Accomplishment/Instructions, paragraph 2.1., of Austro Engine Mandatory Service Bulletin No. MSB-E4-035/1, Revision No. 1, dated September 30, 2021 (MSB-E4-035/1). (2) If, during the performance of the actions required by paragraph (g)(1) of this AD, the HPP driving gear does not pass the inspection, as specified in paragraph 2.1. of Austro Engine MSB-E4-035/1, before further flight, replace the HPP driving gear with a part eligible for installation. (3) For engines equipped with an affected HPP driving gear, within the compliance time specified in Table 1 to paragraph (g)(3) of this AD, as applicable, replace each affected HPP driving gear with a part eligible for installation. ER01NO21.001
Unsafe condition
This AD was prompted by reports of failure of the HPP driving gear and a subsequent investigation by the manufacturer, which determined that a certain batch of HPP driving gears may have been damaged during assembly. The investigation also determined that affected engines equipped with an affected cylinder head were also subject to premature failure of the HPP driving gear. The FAA is issuing this AD to prevent the failure of the HPP driving gear. The unsafe condition, if not addressed, could result in in-flight engine shut-down, forced landing, and damage to the airplane.
Affected ADs
None.
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