Under which circumstance would you NOT attempt an engine restart?

An engine restart should not be attempted in the event of a fire. When a fire is present, the immediate safety of the aircraft and its occupants is the top priority. Attempting to restart an engine in this situation could potentially exacerbate the fire and increase the risk of a catastrophic failure. Additionally, the presence of fire indicates that there may be significant damage to the engine or other systems, making any restart not only dangerous but likely futile.

In other circumstances, such as engine overheating, low altitude, and loss of control, there may still be scenarios where a restart could be attempted depending on the specific situation and the training of the pilot. For instance, with engine overheating, if the situation allows, the pilot may cool the engine down before attempting a restart. At low altitude, while tricky, the situation may still allow for a controlled effort to restart before landing. Similarly, loss of control might present varying degrees of situational awareness where a restart could still be a consideration depending on the circumstances involved. However, the presence of fire unequivocally rules out any attempt to restart the engine for safety reasons.