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Slat
System
PDU
OUTBOARD
OUTBOARD MID 2 MID 1 INBOARD
INBOARD MID 2 MID 1
Asymmetry Brake
SLAT
6
16
30
0
0
OUT
OUT
OUT
OUT
IN
FLAP
SLAT/
FLAP
2 motors
1 per SFCU
channel
P I LOT T R A I N I N G GU I D E
FLIGHT CONTROLS
10-32 For Training Purposes Only
Sept 04
Slat Position and Surface Indications
SLAT POSITION INDICATION AND SURFACE COLOR
If the slats are at commanded position, the slat position indication and slat surface will turn green.
If the slats are in motion, the slat position indication and slat surface will turn white.
If the SLAT FAIL or SLAT FAULT message is displayed, the slat position indication and slat surface will turn
amber.
SYNOPTIC FAILURE ANNUNCIATIONS
LOCATION: ABOVE SLAT POSITION LOGIC
HALFSPEED If SLAT HALFSPD message is on
DRIVE OVERHEAT 1 Overheat detected by channel 1
DRIVE OVERHEAT 2 Overheat detected by channel 2
DRIVE OVERHEAT 1-2 Overheat detected by channel 1 and 2
FLIGHT CONTROLS
FLAP
AIL
ELEV
RUDDER
SLAT OUT
AIL
ELEV
3O
FLIGHT CONTROLS
FLAP
AIL
ELEV
RUDDER
SLAT IN
AIL
ELEV
O
GX_10_027
Failure annunciations
can be displayed
above the SLAT label
Slat Position
Indication Slat Surface
SLAT/FLAP SURFACES RETRACTED SLAT/FLAP SURFACES EXTENDED
For Training Purposes Only
Sept 04
10-33
P I LOT T R A I N I N G GU I D E
FLIGHT CONTROLS
FLAP CONTROL SYSTEM
The flap system has three flap panels with four actuators connected to a flaps Power
Drive Unit (PDU), linked through a rigid driveline (torque tubes/bearings), and
controlled by the slat/flap handle position. The PDU is driven by two DC motors
connected together in a speed sum configuration. Each motor is controlled by a singlechannel
SFCU. There is a brake on each flap motor that is also controlled by the
SFCU. The PDU provides protection against overload and jam conditions.
To protect against asymmetry, there are dual coil brakes and position sensors located
on each outboard station, left and right, that interface with the SFCU. There are also
direction sensors on the flap system used to detect actuator disconnects. The sensors
on the left wing report to SFCU 1 and the sensors on the right wing report to SFCU 2.
Flap System Schematic
The flap position (degrees of travel) and surface position is displayed on the FLIGHT
CONTROL synoptic page. Flap indication is also shown on the EICAS page.
GX_10_028
SFCU
1
SFCU
2
SLAT/FLAP
CONTROL
LEVER
Flap
System
OUTBOARD MIDDLE INBOARD
INBOARD MIDDLE OUTBOARD
PDU
Power
Drive Unit
(2 DC motors,
1 per SFCU channel)
Sensor
Actuator
Position
Transducer
SLAT
6
16
30
0
0
OUT
OUT
OUT
OUT
IN
FLAP
SLAT/
FLAP
P I LOT T R A I N I N G GU I D E
FLIGHT CONTROLS
10-34 For Training Purposes Only
Sept 04
Flap Position and Surface Indications
FLAP POSITION INDICATION AND SURFACE COLOR
If the flaps are at commanded position, the flap position indication and flap surface will turn green.
If the flaps are in motion, the flap position indication and flap surface will turn white.
If the FLAP FAIL or FLAP FAULT message is displayed, the flap position indication and flap surface will turn
amber.
SYNOPTIC FAILURE ANNUNCIATIONS
LOCATION: BELOW FLAP INDICATION LOGIC
HALFSPEED If FLAP HALFSPD message is on
DRIVE OVERHEAT 1 Overheat detected by channel 1
DRIVE OVERHEAT 2 Overheat detected by channel 2
DRIVE OVERHEAT 1-2 Overheat detected by channel 1 and 2
FLIGHT CONTROLS
FLAP
AIL
ELEV
RUDDER
SLAT OUT
AIL
ELEV
3O
FLIGHT CONTROLS
FLAP
AIL
ELEV
RUDDER
SLAT IN
AIL
ELEV
O
GX_10_029
Failure annunciations
can be displayed
below the FLAP label FLAP Position Indication FLAP Surface
SLAT/FLAP SURFACES RETRACTED SLAT/FLAP SURFACES EXTENDED
For Training Purposes Only
Sept 04
10-35
P I LOT T R A I N I N G GU I D E
FLIGHT CONTROLS
SLAT/FLAP Control Lever
An integrated slat/flap selector located in the flight compartment (center pedestal) will
command position of the slat/flap system operation.
The slat/flap configuration is as follows:
Flap Override Switch
A flap override switch is located on the EGPWS panel (center console) in the flight
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