Airworthiness directives › 2024-05-01
AD 2024-05-01 Airworthiness Directives; Austro Engine GmbH Engines
Makes named: austro. Models named: E4, E4P. 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 engines with one of the following: (1) An engine serial number or engine core serial number specified in Table 1 of Austro Engine GMBH Mandatory Service Bulletin No. MSB-E4-042, Revision 0, dated January 31, 2024 (MSB-E4-042), or; (2) An engine serial number or engine core serial number specified in Table 2 of MSB-E4-042.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) For engines or engine cores identified in paragraph (c)(1) of this AD, before further flight after the effective date of this AD, remove each cap screw, installed on the inner main bearing positions of the engine, from service and replace it with a part eligible for installation in accordance with paragraph 2.3, “Main Bearing Screws Replacement” of Austro Engine GmbH Work Instruction WI-MSB-E4-042, Revision 0, dated February 2, 2024 (WI-MSB-E4-042). (2) For engines or engine cores identified in paragraph (c)(2) of this AD, remove each cap screw, installed on the inner main bearing positions of the engine, from service and replace it with a part eligible for installation in accordance with paragraph 2.3, “Main Bearing Screws Replacement” of WI-MSB-E4-042, at the compliance times referenced in paragraph (g)(2)(i) or (ii) of this AD, whichever occurs first: (i) Within 300 flight hours after first installation on an airplane or since last overhaul, as applicable, or before further flight after the effective date of this AD, whichever occurs later. (ii) At the next scheduled engine maintenance, after the effective date of this AD.
Unsafe condition
This AD was prompted by reports of engine failures and the determination that certain batches of cap screws, installed on the inner main bearing positions of the engine, were manufactured at the lower end of the material strength tolerance. The FAA is issuing this AD to prevent piston failure. The unsafe condition, if not addressed, could result in engine failure, reduced control of the airplane, and for single engine airplanes, an emergency landing, possibly resulting in damage to the airplane and injury to occupants.
Affected ADs
None.
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1