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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* Pay attention to the "normal" gyroscope spin-up and spool-down time, and the noises the gyro makes during these operations.
I own a Turbo Arrow (my second), and have heard the problem is not cool-down time but rather spool-down time. Legend has it the turbine spins at 60,000 to 80,000 rpm and depends on the engine oil pump for its lubrication.
As it turns out, the spool-down time is essentially zero.