Airworthiness directives › 2024-19-10
AD 2024-19-10 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 (Austro) Model E4 and E4P engines with an installed piston having part number E4A-72-400-000.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) At the applicable times specified in paragraphs (g)(1)(i) through (iv) of this AD, do repetitive borescope inspections (BSIs) of each affected piston for cracks on the piston in accordance with paragraph 2.1.2 “Accomplishment/Instructions” of Austro Mandatory Service Bulletin No. MSB-E4-043/0, dated August 27, 2024. (i) For Configuration E4A and E4P engines with less than 100 flight hours (FHs) since installation as of the effective date of this AD: Inspect within 100 FHs since installation and thereafter at intervals not to exceed 50 FHs. (ii) For Configuration E4A and E4P engines with 100 FHs or more since installation as of the effective date of this AD: Inspect before further flight and thereafter at intervals not to exceed 50 FHs. (iii) For Configuration E4B and E4C engines with less than 200 FHs since installation as of the effective date of this AD: Inspect within 200 FHs since installation and thereafter at intervals not to exceed 100 FHs. (iv) For Configuration E4B and E4C engines with 200 FHs or more since installation as of the effective date of this AD: Inspect before further flight and thereafter at intervals not to exceed 100 FHs. (2) If during any BSI required by paragraph (g)(1) of this AD, any crack is found, before further flight, do the following: (i) Remove from service and replace the piston. Replacement of the engine core includes piston replacement and would satisfy this requirement. (ii) Collect a fuel sample from the high-pressure pump (HPP) fuel return line and do a fuel analysis for water contamination. (iii) If during any fuel analysis required by paragraph (g)(2)(ii), any water contamination is found, remove from service and replace the HPP, injectors, and fuel rails.
Unsafe condition
This AD was prompted by reports of engine failures and an investigation where cracks were discovered on the pistons. The FAA is issuing this AD to detect and address cracks on the pistons. The unsafe condition, if not addressed, could result in engine failure with consequent reduced control of the airplane and, for single-engine airplanes, damage to the airplane and injury to occupants during an emergency landing.
Affected ADs
None.
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