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Bell 407 Restart Fault

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In relation to a RESTART FAULT the RFM states that after you roll the throttle to idle (after landing) the PMA will go off line and you might have a flame out. My question is why would this happen? Under 85% nP the DC bus would supply the ECU with power and keep the engine running correct? RFM excerpt: When throttle is repositioned to idle stop (during engine shutdown) the PMA will go offline and engine may flameout. Thanks in advance for any insight from folks far more knowledgeable than myself.

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