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priority is required by switch selection, for MFS operation due to disconnect. The 30-
second time delay for illumination of the ROLL SEL captions is to avoid increasing
pilot workload in the instant following an aileron system failure.
NOSEDN
NOSEUP
DISC
MASTER
TCS
MIC
FCU’s
ROLL DISCONNECT
SWITCH
Roll
Command
Sensor
Jammed
Aileron Circuit
GX_10_047
NOSEDN
NOSEUP
DISC
MASTER
TCS
MIC
ROLL SPLRS
PLT CONT
ROLL
SEL
PLT
ROLL
ROLL SPLRS
CPLT CONT
ROLL
SEL
CPLT
ROLL
For Training Purposes Only
Sept 04
10-49
P I LOT T R A I N I N G GU I D E
FLIGHT CONTROLS
Selecting the appropriate priority switch prior to, or following a ROLL SEL
indication, commands the valid side to be used by the FCUs. Example above: if pilot
side is selected, both pilot and copilot ROLL SEL captions extinguish and the PLT
ROLL caption illuminates, and vice versa for a copilot action. Until one side is
selected, the FCUs continue to average pilot and copilot roll commands. After switch
selection, both FCUs will use the corresponding roll input (unjammed side). This will
enable the MFS to operate through their full range of operation with a single control
column input.
ROLL SPLRS
PLT CONT
ROLL
SEL
PLT
ROLL
ROLL SPLRS
CPLT CONT
ROLL
SEL
CPLT
ROLL
NOSEDN
NOSEUP
DISC
MASTER
TCS
MIC
ROLL DISCONNECT
SWITCH
Jammed
Aileron Circuit
GX_10_048
1 2 1 2
FCU 1 FCU 2
Roll
Command
Sensors
PILOT ROLL
PRIORITY
SWITCH
COPILOT ROLL
PRIORITY
SWITCH
TO MFS TO MFS
LEGEND
Active sensor
input
Inactive sensor
input
NOSEDN
NOSEUP
DISC
MASTER
TCS
MIC
P I LOT T R A I N I N G GU I D E
FLIGHT CONTROLS
10-50 For Training Purposes Only
Sept 04
GND Lift Dumping/Auto Brake Control Panel
The panel is located in the center pedestal and is used to manually arm or disarm the
spoiler system.
Ground Lift Dumping
Ground lift dumping function commands extension of the spoilers when engines are
equal 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 or 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 takeoff
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.
GND LIFT
DUMPING
AUTO BRAKE
AUTO
OFF LOW
MED
HI
MANUAL ARM
OFF
AU
F
GX_10_049
GND LIFT DUMPING Switch
MANUAL ARM
AUTO
OFF OFF”
• – Manually arms the
ground lift dumping system and when the
airplane is on ground, all spoilers will be
commanded to deploy. A status message
will be displayed when the switch is
selected to manual arm.
• – Arms the ground lift dumping.
• – Selecting the switch “ will
disarm the ground lift dumping system in
the event of an inadvertent deployment
or failure of the automatic system. A
status message will be displayed when
the switch is selected to off.
For Training Purposes Only
Sept 04
10-51
P I LOT T R A I N I N G GU I D E
FLIGHT CONTROLS
Deployment
All spoilers deploy automatically during a rejected takeoff.
The GSs 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:
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