spool down

spool down (third-person singular simple present spools down, present participle spooling down, simple past and past participle spooled down)

1. (aviation, of a turbine engine) To decrease in rotational speed, producing a decrease in thrust.

   All ground personnel MUST be made aware that big jet engines take a considerable time to spool down. We don't want any more mechanics getting sucked in or catapulted across the apron.

• spool up

• spooldown