Troubleshoot And Repair Engine Thrust Reverser Systems And Related Components

Question 1

Why are thrust reverses not normally used when the airplane is moving below approximately 60 knots?

Answer 1

There is a danger of recirculating the exhaust gases, and of the engine ingesting foreign objects stirred up by high-velocity gases.

Question 2

What is a mechanical-blockage thrust reverser?

Answer 2

A thrust reverser that slides a pair of scoop-shaped doors aft and opens them so they block the reward flow of gases and deflect the gases forward.

Question 3

How does a cascade-type thrust reverser operate?

Answer 3

A portion of the fan cowl moves rearward, and a series of blocker doors deflect the fan discharge air through fan cascades that direct the discharge air forward. At the same time, blocker doors shut off the flow of gases from the core engine and deflect it through cascades that direct it forward.