MD-80 Flight Manual 麦道80飞行手册 2(132)

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The YAW DAMP switch has OVRD, OFF, and ON positions.
The OVRD position depowers the yaw damper servo – rendering the Yaw Damper inoperative.
The OFF position powers the yaw damper servo but will not allow the DFGS to signal the yaw damper – unless the autopilot is engaged.
The ON position powers the yaw damper servo and provides a DFGS signal to the yaw damper – regardless of autopilot engagement.
SECONDARY FLIGHT CONTROLS
Spoiler System
Each wing has two hydraulically operated flight spoilers that are operational during all phases of flight and a ground spoiler that is operable on the ground only. The spoiler system provides the following operational modes:
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Lateral control augmentation in all modes of flight spoiler operation.

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Automatic ground and flight spoiler extension upon touchdown and main wheel spinup to spoil lift, thereby increasing braking efficiency.

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Manual extension of ground and flight spoilers during landing or rejected takeoff.

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Selectable extension of flight spoilers to serve as speedbrakes.

Flight Spoilers
An inboard and outboard spoiler on each wing supplement the ailerons for lateral control. Movement of the spoilers occurs as the control wheel actuates the ailerons, which are cable connected to the spoiler system. Both the inboard and outboard spoiler systems are interconnected to both aileron control systems through a mechanical mixer assembly. This aileron/spoiler mixer assembly provides control of spoiler movement in relation to aileron movement. When the control wheel is moved to approximately 5° of aileron throw, the flight spoiler will start to extend on the downward wing. Further control wheel movement will extend the spoiler proportionate to lateral control demands.
When the speed brake handle is manually moved aft and the control wheel rotated, the aileron/spoiler mixer assembly will operate the flight spoilers asymmetrically to increase spoiler extension on the downward moving wing and decrease spoiler extension on the upward wing. During landing roll, when the spoilers are at the maximum extend position (60°), use of down aileron (to lift wing) will cause the spoiler on that wing to partially retract.
Inboard and outboard flight spoiler systems are powered by separate hydraulic systems. If one hydraulic system fails, one-half of the flight spoiler system effectiveness is retained.
Speed Brakes
During flight, manually moving the pedestal-mounted speedbrake/spoiler lever aft will extend the four flight spoilers to serve as speedbrakes.  These surfaces may be symmetrically extended approximately 6° per notch to a maximum of 35°.
Use of aileron control during speed brake operation results in asymmetrical extension of the spoilers to aid in lateral control.
In flight, if the speed brakes are extended with the flaps beyond 6°, the annunciator light (SPOILER / FLAP EXTENDED), and MASTER CAUTION lights illuminate. In addition, the aural warning will sound.
On the ground, if either throttle is (or on airplanes with Service Bulletin 31-34 incorporated or production equivalent, both throttles are) advanced with the spoilers extended (speedbrakes), the aural warning will come on. The SPOILER / FLAP EXTENDED light will come on whenever the flaps are extended to or beyond 6 . amd the spoilers are extended. The SPOILER / FLAP EXTENDED light is de-energized on the ground during and after an automatic-spoiler landing until retraction of flaps or speedbrakes.
Ground Spoilers
The aircraft is equipped with an Inboard Ground Spoiler panel on each wing. These panels are normally locked down and are unlocked when the aircraft has normal electrical power, the throttles are at idle, and weight is on the main gear.
After landing, all spoilers (flight and ground) may be extended (by use of the Spoiler lever) to a maximum of 60° to serve as ground spoilers.
The system may be armed for automatic operation by pulling up on the speedbrakes / spoiler lever until a red armed placard is exposed and the lever latches in the up position.

Continental
Rev. 12/01/00 #29 Flight Manual
When the system is armed for landing and throttles are at idle, the spoilers will automatically extend after wheel spin-up on ground contact or after nosegear oleo actuates ground shift. The spoilers will retract and the speedbrakes / spoiler lever will be disarmed if left throttle is advanced for a go-around. A SPOILER DEPLOYED light will illuminate when the airplane is on the ground, speedbrake / spoiler lever stowed, and any spoiler panel is extended more than approximately 10° – 2° regardless of throttle position. On airplanes with Service Bulletin 27-257 incorporated or production equivalent, the SPOILER DEPLOYED light is inhibited for the flight spoilers when the airplane is on the ground, the throttles are advanced for takeoff, and the spoilers are extended by means of control wheel input.
　
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