FAA Questions/Airline Transport Pilot/Question #23
flight operationsFAA-published sample question (ATM, Aug 2021)

Ground spoilers used after landing are

A

more effective at low speed.

B

equally effective at any speed.

C

more effective at high speed.✓ Correct Answer

Explanation

Ground spoilers work by destroying lift and adding drag, both of which depend on dynamic pressure, so they are most effective at high speed right after touchdown, transferring weight to the wheels for braking. Their effect fades as speed decreases.

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