Airworthiness directives › 2022-03-03
AD 2022-03-03 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, installed in combination with high-pressure pump (HPP) driving gear P/N E4A-30-000-601 (any revision), P/N E4A-30-000-201 rev. AB.1, or 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-E4-036/1, Revision No. 1, dated December 14, 2021 (MSB-E4-036/1); or (2) An HPP driving gear, having P/N E4A-30-000-201, with an S/N listed in Chapter 1.4, Table 1 of Austro Engine MSB-E4-036/1.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) For engines equipped with a cylinder head and HPP driving gear combination identified in paragraph (c)(1) of this AD, before further flight after the effective date of this AD, remove the HPP driving gear and replace it with an HPP driving gear eligible for installation using paragraphs 2.1.1 through 2.1.4., Removal and inspection of the HPP driving gear, of Austro Engine MSB-E4-036/1. (2) Before further flight after performing the required actions in paragraph (g)(1) of this AD, visually inspect the removed HPP driving gear using the criteria in paragraph 7. Appendix II, Table 6, of Austro Engine MSB-E4-036/1. (3) If, based on the visual inspection required by paragraph (g)(2) of this AD, the HPP driving gear does not meet the acceptable condition criteria in paragraph 7. Appendix II, Table 6, of Austro Engine MSB-E4-036/1, before further flight, visually inspect the HPP shaft, cylinder head, camshaft gear, and inlet/outlet camshaft bushing using the criteria in paragraph 7. Appendix II, Table 7, of Austro Engine MSB-E4-036/1. (4) If, based on the visual inspection required by paragraph (g)(3) of this AD, the HPP shaft, cylinder head, camshaft gear, or inlet/outlet camshaft bushing do not meet the acceptable condition criteria in paragraph 7. Appendix II, Table 7, of Austro Engine MSB-E4-036/1, before further flight, remove any part not meeting the acceptable condition criteria and replace with a part eligible for installation. (5) For engines equipped with an affected HPP driving gear identified in paragraph (c)(2) of this AD, within the compliance time specified in Table 1 to paragraph (g)(5) of this AD, as applicable, replace the HPP driving gear with an HPP driving gear eligible for installation. ER28JA22.002
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 the combination of a certain affected cylinder head installed on an engine with a certain affected HPP driving gear installed on the same engine may cause damage to 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
This AD replaces AD 2021-22-20, Amendment 39-21793 (86 FR 60159, November 1, 2021).
Read the original on the Federal Register →
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