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SPOILER SYSTEM OPERATION
The spoiler system modes of operations are as follows:
Ground Lift Dumping
Ground lift dumping function commands extension of the spoilers when engines are equal to or below idle and the ground condition is recognized. Engine throttle lever position is provided by sensors in the throttle lever assembly.
Ground condition is determined from the airplane height provided by:
.
Radio Altimeters (RA).
.
Wheel speed, through the Brake Control Unit (BCU).
.
Weight-On-Wheels(WOW), through the Landing Gear Electronic Control Unit (LGECU).
The ground lift dumping system is fully automated or can be operated manually. Arming, deployment and retraction is controlled by the FCUs.
In the event of a malfunction, failure of the automatic arming or disarming (automatic retraction), the ground lift dumping system may be manually armed or manually disarmed through the GND LIFT DUMP/AUTOBRAKE panel.
Arming
The system is automatically armed when the throttle levers are at the minimum take-off position (30° TLA). To prevent inadvertent deployment during taxi, automatic arming will not latch until a takeoff speed of 45 knots is reached. The flight compartment ground lift dumping “MANUAL ARM” switch is provided in case of auto arming failure and to test the system during pre-flight.
Deployment
All spoilers deploy simultaneously during a rejected take-off.
The GS deploy first in order to dump the airplane lift; therefore, the logic is split for GS and MFS operations.
To deploy ground spoilers the system must be armed, engine throttles at idle position (or below) and two of the three following conditions:
.
Radio Altimeter (RA) below 7 feet.
.
Left or right main landing gear WOW indication.
.
Left or right wheel speed greater than 16 knots.
Radio altimeter and wheel spin will normally be the first conditions satisfied. Deployment of the MFS is delayed until the airplane is more firmly on the ground to prolong maximum roll control, through the spoilers roll assist function.
To deploy multi-functional spoilers the ground lift dumping must be armed, both the left and right throttles at idle (or below) and:
.
Both main landing gear have WOW.
AND
.
Left or right wheel speed indication above 16 knots, OR radio altimeter below 7 ft.
When the MFS are commanded for ground lift dumping, roll assist is available for partial multi-function spoiler operation.
Volume 2 Flight Crew Operating Manual Rev 2A, Apr 11, 2005
SPOILER SYSTEM OPERATION (CONT'D)
Disarm
The logic automatically disarms after the airplane has been on the ground for 40 seconds following touchdown and the wheel speed has decreased below 45 knots for 30 seconds. Automatic disarming prevents the spoilers from deploying during taxiing. The system can also be manually disarmed (turned off) to override the automatic arm/disarm circuits, through the ground lift dumping “OFF”switch on the “GND LIFT DUMP/AUTOBRAKE”panel located in the centre pedestal.
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