spool-down time

rundown time

The time taken by a turbine in a gas turbine engine to come to a complete halt after the engine has been switched off. It is one of the indicators of the state of health of an aircraft engine. Also called spool-down time.
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I own a Turbo Arrow (my second), and have heard the problem is not cool-down time but rather spool-down time.
As it turns out, the spool-down time is essentially zero.