Engine — Timing Chain — Replacement / Aircraft Flight Manual — Limitations Section — Amendment
- Published
- Effective
- Deadline
- Replaces
- 2017-0103
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Affected operators must amend the applicable Aircraft Flight Manual within 30 days after 28 June 2017 to restrict windmilling restarts to emergency procedures only and inform all flight crews accordingly. They should continue to comply with EASA AD 2019-0041 for timing chain replacement requirements. Alternative methods of compliance may be requested and approved by EASA if substantiated.
Summary
EASA Airworthiness Directive 2017-0103R1 is an amendment addressing Austro Engine GmbH E4 series and E4P engines installed on twin-engine aircraft such as the Diamond Aircraft Industries DA 42 NG, DA 42 M-NG, and DA 62. The directive focuses on the timing chain wear issue linked to windmilling restarts and updates the Aircraft Flight Manual limitations section accordingly. It mandates operational restrictions on windmilling restarts and updates to the AFM to mitigate engine power loss risks.
What changed
EASA Airworthiness Directive 2017-0103R1 revises the original AD 2017-0103 by removing the requirement for mandatory timing chain replacement, as this action is now covered under a separate AD 2019-0041. The amendment retains the requirement to update the Aircraft Flight Manual to limit windmilling restarts to emergency use only. Deleted previous replacement and parts installation requirements.
Why it matters
This directive is critical for aviation professionals to prevent engine timing chain failure caused by windmilling restarts, which can lead to engine power loss and reduced aircraft control. Operators and maintenance organizations must ensure compliance with updated AFM limitations to maintain airworthiness and safety. It clarifies compliance responsibilities and avoids redundant maintenance actions by referencing the newer AD for timing chain replacement.
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