Before attempting an inflight restart, wait for the N1 to equal __________ %.

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Multiple Choice

Before attempting an inflight restart, wait for the N1 to equal __________ %.

Explanation:
N1 is the speed of the low‑pressure compressor, and a restart in flight should start from a completely stopped engine. Waiting until N1 is 0% confirms there is no residual rotation (no windmilling), so the fuel and ignition can light off cleanly from a true zero RPM. If N1 were above zero, the engine would still be turning, which raises the risk of a surge or other abnormal start and makes the restart unsafe. So the correct condition to wait for is 0%.

N1 is the speed of the low‑pressure compressor, and a restart in flight should start from a completely stopped engine. Waiting until N1 is 0% confirms there is no residual rotation (no windmilling), so the fuel and ignition can light off cleanly from a true zero RPM. If N1 were above zero, the engine would still be turning, which raises the risk of a surge or other abnormal start and makes the restart unsafe. So the correct condition to wait for is 0%.

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