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Airworthiness Directive

AD 2023-20-03 88 FR 76104 Superseded

Federal Aviation Administration · 14 CFR part 39

Requires repetitive engine oil analysis for aluminum content outside the acceptable limits and, if necessary, replacement of the pistons, piston rings, con-rods assembly, and crankcase or, as an alternative, replacement of the engine core.

Superseded by AD 2025-02-12Federal Register (opens in a new tab)FAA DRS (opens in a new tab)

FR document
2023-24385
Amendment
39-22562
Published
2023-11-06
Effective
2023-12-11
Models covered
1

Last live check: 2026-08-19

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AD

2023-20-03

FR doc 2023-24385 · 88 FR 76104

AD 2023-20-03Published 2023-11-06Effective 2023-12-11

Superseded by 2025-02-12

Supersedence is read from the Federal Register text of the newer AD — the FAA publishes no structured field for it — and names only ADs held in our index.

FAA rule - 14 CFR 39

FAA rule. Compliance with an applicable AD is required under 14 CFR 39.7. Check its effective date, applicability, compliance times and current status.

Requires repetitive engine oil analysis for aluminum content outside the acceptable limits and, if necessary, replacement of the pistons, piston rings, con-rods assembly, and crankcase or, as an alternative, replacement of the engine core.

Full official abstract

The FAA is adopting a new airworthiness directive (AD) for certain Austro Engine GmbH Model E4 and E4P engines. This AD is prompted by reports of piston failures and the determination that certain batches of pistons were manufactured with a dimensional deviation in the piston pin bore and piston diameter. This AD requires repetitive engine oil analysis for aluminum content outside the acceptable limits and, if necessary, replacement of the pistons, piston rings, con-rods assembly, and crankcase or, as an alternative, replacement of the engine core. The FAA is issuing this AD to address the unsafe condition on these products.

More directives for Austro Engine E4

  1. AD 2025-02-12 Airworthiness Directives; Austro Engine GmbH Engines Effective 2025-04-01
  2. AD 2024-19-10 Airworthiness Directives; Austro Engine GmbH Engines Effective 2024-10-09
  3. AD 2024-05-01 Airworthiness Directives; Austro Engine GmbH Engines Effective 2024-03-11
  4. AD 2022-03-03 Airworthiness Directives; Austro Engine GmbH Engines Effective 2022-02-14
  5. AD 2021-24-10 Airworthiness Directives; Austro Engine GmbH Engines Effective 2021-12-27

All Austro Engine E4 directives

View on Federal Register (opens in a new tab) View this AD in FAA DRS (opens in a new tab) Print AD packet (opens the full Federal Register document in a new tab)

Applies to 1 model in our index