Airworthiness directives › 2020-14-07
AD 2020-14-07 Airworthiness Directives; Austro Engine GmbH Engines
Makes named: austro. Models named: E4, E4P diesel piston. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to Austro Engine GmbH Model E4 and E4P diesel piston engines.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) For engines that have had a windmill restart before the effective date of this AD or for engines with a timing chain in which it cannot be determined if the engine has experienced any windmilling, after the effective date of this AD, remove the timing chain and replace with a part eligible for installation as follows, whichever occurs later: (i) Before the timing chain exceeds 900 flight hours (FHs) since new, or; (ii) Within 100 FHs after the windmilling restart, or; (iii) Before further flight. (2) For engines that have a windmill restart after the effective date of this AD, remove the timing chain before it exceeds 900 FHs since new or within 100 FHs after the windmilling restart, whichever occurs later, and replace with a part eligible for installation. (3) Remove the fuel injectors and replace with parts eligible for installation before they exceed 900 FHs since new or before further flight after the effective date of this AD, whichever occurs later. (i) Use Accomplishment/Instructions, paragraph 2.1, of Austro Engine Mandatory Service Bulletin (MSB) No. MSB-E4-025, Rev. No. 3, dated January 8, 2019, to perform the required actions in paragraph (g)(3) of this AD. (ii) [Reserved] (4) Thereafter, repeat the replacement of the fuel injectors required by paragraph (g)(3) of this AD at intervals not exceeding 900 FHs since new.
Unsafe condition
This AD was prompted by reports of considerable wear of the timing chain and failure of fuel injectors on the affected engines. The FAA is issuing this AD to prevent failure of the timing chain and fuel injectors. The unsafe condition, if not addressed, could result in loss of engine thrust control and reduced control of the airplane.
Affected ADs
None.
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