What is the proper operating sequence when using thrust reversers to slow an aircraft after landing?

What is the proper operating sequence when using thrust reversers to slow an aircraft after landing?

• A. Advance thrust levers up to takeoff position as conditions require, select thrust reverse, de-select thrust reverser, retard thrust levers to ground idle
• B. Retard thrust levers to ground idle, raise thrust reverser levers as required and retard thrust reverser levers to ground idle
• C. Select thrust reverse advance thrust reverser levers no higher than 75 percent N(1) and retard thrust reverser levers to idle at approximately normal taxi speed
• D. Retard thrust levers to ground idle, raise thrust reverser levers as required and retard thrust reverser levers to ground idle

Answer: (D)

The sequence tested is about using reverse thrust to assist braking safely after touchdown. Start by pulling the thrust levers back to ground idle on both engines. This reduces engine thrust and sets the engines up for reverse operation, which is safer and more effective when the engines are near idle. Then deploy the thrust reversers as needed to help slow the aircraft; the reversers provide additional deceleration beyond wheel braking. Once you’ve slowed to a safe taxi speed and are ready to exit the runway or resume taxiing, retract the reversers back to the ground-idle/stowed position. Keeping thrust at idle during the taxi helps prevent unintended acceleration and reduces wear on the reverser system. So, the proper order is: idle the thrust levers first, deploy reversers as required, then retract reversers to idle.

The sequence tested is about using reverse thrust to assist braking safely after touchdown. Start by pulling the thrust levers back to ground idle on both engines. This reduces engine thrust and sets the engines up for reverse operation, which is safer and more effective when the engines are near idle. Then deploy the thrust reversers as needed to help slow the aircraft; the reversers provide additional deceleration beyond wheel braking. Once you’ve slowed to a safe taxi speed and are ready to exit the runway or resume taxiing, retract the reversers back to the ground-idle/stowed position. Keeping thrust at idle during the taxi helps prevent unintended acceleration and reduces wear on the reverser system.

So, the proper order is: idle the thrust levers first, deploy reversers as required, then retract reversers to idle.