Can an engine that has previously experienced a fire be restarted?
An engine that has been on fire may have sustained significant damage to critical components. Restarting it could indeed pose a high risk of reignition or further complications.
In addition, restarting an engine in flight after a ground fire, or even if the aircraft is at a safe altitude, is extremely risky. The potential for further problems and the need for immediate attention in case of another failure makes this option unsafe.
Lastly, while carburetor fires can sometimes be managed with proper procedures, any engine that has been on fire should be carefully inspected before restarting. Assuming the fire was due to a carburetor issue does not negate the risks associated with potential damage from the fire.
Therefore, "No, the risk of a reignition of the fire would be too high" is the correct answer.
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Austro Control