Do jet aircraft have an emergency propeller?

Published on Author Code Father
Do jet aircraft have an emergency propeller?There is an emergency propeller that comes down in an emergency of jet-engine aircrafts. It is behind the main landing gears.Is this true or a story somebody made up?

The Ram Air Turbine, which is deployed in case of some aircraft in case of loss of main electrical power supply. From A320 Systems briefing:

In case of total loss of all main generators, the RAT is automatically extended and drives the emergency generator via a hydraulic motor.

The location of the ram air turbine varies with different aircraft and some of them (like the popular A320) have them near the landing gear. The following image is from @mins’ excellent answer to another question.

RAM air turbine

Location of Ram Air Turbines in different aircraft, image from aviation.stackexchange.com

  1. Bombardier BD700-1A11 Global 5000 (source)
  2. Airbus A320 Flight test (source)
  3. Bombardier CRJ700 (source)
  4. US Navy T-45A (source)
  5. Airbus A330 (source)
  6. Boeing B747-8 (picture by Gregor Schl├Ąger, source)
  7. Boeing B777, RAT extension switch (source)

 

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