Discussion
Arrange the landing deceleration sequence in order:
1. Reversers are deployed and the fan flow is turned
2. Main wheels touch down and spoilers deploy
3. Wheel braking takes over as the main retarding force
4. Reversers are stowed at the specified speed
Select the correct sequence.
Answer: C
Correct answer: 2, 1, 3, 4
The sequence follows the landing roll. Main wheels touch down and the spoilers deploy (2), dumping lift so that weight transfers to the wheels and the brakes can work.
Reversers are deployed and the fan flow turned (1), and they are most effective at high speed where their momentum change is greatest. As speed falls, wheel braking takes over as the main retarding force (3), and the reversers are stowed at the specified speed (4) - before they begin re-ingesting their own efflux and any debris it has raised.
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