Speed Brakes
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 and only the flight spoilers extend when the airplane is
in the air.
The SPEEDBRAKES EXTENDED light provides an indication of spoiler operation in-flight
and on the ground. In-flight, the light illuminates to warn the crew that the speed brakes are
extended while in the landing configuration or below 800 feet AGL. On the ground, the light
illuminates when hydraulic pressure is sensed in the ground spoiler shutoff valve with the
speed brake lever in the DOWN position.
In-Flight Operation
Operating the SPEED BRAKE lever in flight causes all flight spoiler panels to rise
symmetrically to act as speed brakes. Caution should be exercised when deploying flight
spoilers during a turn, as they greatly increase roll rate. When the speed brakes are in an
intermediate position roll rates increase significantly. Moving the SPEED BRAKE lever
beyond the FLIGHT DETENT causes buffeting and is prohibited in flight.
