ram-air turbine

British

noun

a small air-driven turbine fitted to an aircraft to provide power in the event of a failure of the normal systems

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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ram-air turbine

At the same time, a ram-air turbine dropped into position beneath the aircraft's belly.

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