The speed brakes consist of flight spoilers and ground spoilers. Hydraulic System A powers all four ground spoilers, two on the upper surface of each wing. The SPEED BRAKE Lever controls the spoilers. When the SPEED BRAKE Lever is actuated all the spoilers extend when the airplane is on the ground.

NOTE

Compression of any landing gear strut enables the flight spoilers to deploy. Compression of the right main landing gear strut enables the ground spoilers to deploy.

• Both throttles are retarded to IDLE
• Main landing gear wheels spin up (more than 60 kts).

The SPEED BRAKE Lever automatically moves to the UP position and the spoilers deploy.

If a wheel spin-up signal is not detected, when the Air/Ground System senses ground mode (any gear strut compresses) the SPEED BRAKE Lever moves to the UP position and flight spoiler panels deploy automatically. When the right main landing gear strut compresses, a mechanical linkage opens the Ground Spoiler Bypass Valve and the ground spoilers deploy.

If the SPEED BRAKE Lever is in the DOWN position during landing or rejected takeoff, the Auto Speed Brake System operates when these conditions occur:

• Main landing gear wheels spin up (more than 60 kts)
• Both throttles are retarded to IDLE
• Reverse thrust levers are positioned for reverse thrust.

The SPEED BRAKE Lever automatically moves to the UP position and spoilers deploy.

After an RTO or landing, if either throttle is advanced, the SPEED BRAKE Lever automatically moves to the DOWN detent and all spoiler panels retract. The spoiler panels may also be retracted by manually moving the SPEED BRAKE Lever to the DOWN detent.