Originally posted by elaw
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Ground Operation
All flight and ground spoilers will automatically rise to full extend on landing if the speed brake lever is in the ARMED position and both thrust levers are at IDLE. When spin-up occurs on any two main wheels, the speed brake lever moves to the UP position and the flight spoilers extend. When the right main landing gear shock strut is compressed, a mechanical linkage opens the ground spoiler shutoff valve to extend the ground spoilers. If a wheel spin-up signal is not detected, the speed brake lever will move to the UP position and all spoiler panels will deploy automatically, after the ground safety sensor engages in the ground mode (main gear strut compression).
All spoiler panels will extend automatically if takeoff is rejected and the thrust reverse levers are positioned for reverse thrust. Wheel spin-up (60 kts.) must have occurred on any two main wheels in order for the automatic extension to take place.
After an RTO or landing, if either thrust lever 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.
A failure in the automatic functions of the speed brakes is indicated by the illumination of the SPEED BRAKE DO NOT ARM light. In the event the automatic system is inoperative, the speedbrake lever must be moved manually to the UP position after landing.
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