Electrical Power – Voter Switch Cycling while Restarting the Engine - Airplane Flight Manual - Amendment
- Published
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AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of Diamond DA40 NG aircraft must amend their Airplane Flight Manual to include the new engine restart procedures from Revision 4 within 30 days of the effective date, November 13, 2026. Pilots must then follow these updated procedures during engine restart attempts in flight. Incorporation of any later Transport Canada-approved revision containing these procedures also satisfies the directive requirements.
Summary
Airworthiness Directive CF-2026-57 is an amendment to the Airplane Flight Manual for Diamond Aircraft Industries Inc Model DA40 NG aeroplanes. It addresses an issue where the Electronic Engine Control Unit (EECU) voter switch cycling during engine restart can prevent uncommanded engine shutdowns. This directive mandates updated procedures in the DA40 NG Airplane Flight Manual to improve engine restart reliability.
What changed
This directive introduces mandatory incorporation of new procedures in Section 3.3.5 – Restarting the Engine in Flight of the DA40 NG Airplane Flight Manual Revision 4. These procedures require pilots to cycle the EECU voter switch to manually select a functional EECU channel during engine restart attempts. This change mitigates the risk of uncommanded engine shutdown caused by a failed fuse simulating an erroneous Engine Master switch-off command.
Why it matters
This amendment is critical for operators and maintenance teams as it directly addresses a safety risk of uncommanded engine shutdown in flight. Compliance ensures pilots have clear instructions to restore engine operation effectively, reducing the likelihood of in-flight engine failures. It also aligns operational procedures with updated regulatory requirements, supporting continued airworthiness and regulatory compliance.
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