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• Radio Altimeter (RA) below 7 feet
• One left or right main landing gear WOW indication
• One 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
allow full pilot roll control through the use of spoiler roll assist.
To deploy multifunction 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 and right wheel speed indication above 16 knots, or RA below 7 feet
When the MFS are fully extended for ground lift dumping, roll assist is available for
multifunction spoiler operation.
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 center pedestal.
P I LOT T R A I N I N G GU I D E
FLIGHT CONTROLS
10-52 For Training Purposes Only
Sept 04
Spoiler System/FCU Interface
The spoiler system operation is under control of two Flight Control Units (FCUs)
which have dual modules to control and monitor the spoiler surfaces in pairs. The
FCUs receive input from various airplane systems and schedule the MFSs either
symmetrically or proportionally, depending on airplane configuration. The FCUs also
control and monitor the operation of the GS through valves within the ground spoiler
selector valves. Refer to SPOILER CONTROL AND MONITORING in this chapter.
The FCUs control the priority of spoiler operations for flight and ground phases of
operation, and spoiler system malfunctions are reported on the EICAS system.
The FCUs interface with the following systems for spoiler control and monitoring:
• BCU – Brake Control Unit provides wheel speed for Ground Lift Dumping (GLD)
logic
• LGECU – Landing Gear Electronic Control Unit provides Weight-On-Wheels
(WOW) for GLD logic
• DAUs – Data Acquisition Units provide hydraulic pressure data
• ADCs – Air Data Computers provide airspeed data
• RA – Radio Altimeter provides height for GLD
• TQ – Throttle Quadrant assembly provides left and right throttle lever position
sensors for GLD logic.
• SFCU – Slat/Flap Control Unit provides flap position for Proportional Lift
Dumping (PLD)
For Training Purposes Only
Sept 04
10-53
P I LOT T R A I N I N G GU I D E
FLIGHT CONTROLS
Spoiler FCU Input Schematic
ROLL SPLRS
CPLT CONT
ROLL
SEL
CPLT
ROLL
ROLL SPLRS
PLT CONT
ROLL
SEL
PLT
ROLL
MAX
THRUST
IDLE
REV
MAX REV
ENG
RUN
OFF OFF
L R
FLIGHT
SPOILER
R
E
T
R
A
C
MAX T
1/2
FULL
0
GX_10_050
PILOT ROLL
PRIORITY PBA
COPILOT ROLL
PRIORITY PBA
ROLL
COMMAND
SENSOR
ROLL DISCONNECT
SWITCH
Flight
Spoiler
Handle
THROTTLE QUADRANT
ASSEMBLY
OUTBOARD
WHEEL SPEED
INBOARD
WHEEL SPEED
BCU CHANNEL A BCU CHANNEL B
FCU 2
MODULE
2B
MODULE
2A
FCU 1
MODULE
1A
MODULE
1B
RA 1
ADC 1 (BUS 1)
ADC 2 (BUS 1)
ADC 3 (BUS 1)
SFCU 1
LGECU CHANNEL A
RA 2
ADC 1 (BUS 2)
ADC 2 (BUS 2)
ADC 3 (BUS 2)
SFCU 2
LGECU CHANNEL B
DAU
DATA
DAU
DATA
LEGEND
Signals to FCU
NOSEDN
NOSE UP
DISC
MASTER
TCS
MIC
NOSEDN
NOSEUP
DISC
MASTER
TCS
MIC
GND LIFT
DUMPING
AUTO
MANUAL ARM
OFF
AU
F
P I LOT T R A I N I N G GU I D E
FLIGHT CONTROLS
10-54 For Training Purposes Only
Sept 04
Spoiler Control and Monitoring
Spoiler control and monitoring of the MFS and ground spoilers are as follows:
Multifunctional Spoilers
The MFS PCUs are hydraulically powered and electrically controlled. The FCU
controls each PCU servo valve and uses an integral sensor to determine their position.
The PCUs incorporate a hydraulic lock to prevent upfloat in the event of a hydraulic
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