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has three leading edge slats and two trailing edge flaps. Both systems are selected and
operated by a single electronic slat/flap control lever, located on the center pedestal. During
extension, the slats move forward and down on geared tracks, the flaps move slightly aft
and down around hinge pivots.
Each system is driven by a dual motor power drive unit. The power drive units drive the
flaps and slats through a series of drive shafts, gearboxes and actuators. Brake position
sensor units, mounted at the outboard ends of each drive system, provide braking for
asymmetric protection and provide surface position feedback to the slat/flap electronic
control units (SFECUs). Flap skew sensors and slat disconnect sensors provide fault
detection in the event of a failure in a drive system.
When a slat/flap selection is made, the SFECUs release the system brakes and command
the power drive units to deploy or retract the slats and flaps to the selected position. An
overspeed clacker will sound if the airspeed is too high for the selected flap setting.
If one of the two power drive unit motors fails, the system will remain functional at half
speed. In the event of mechanical failure of the control lever, an emergency flap switch will
allow limited slat and flap selection. When the emergency flap switch is actuated, the
SFECUs will override the control lever selection, and extend the flaps to 20_ and extend the
slats. If emergency flap deployment is selected at an airspeed higher than 230 knots, the
control unit will delay deployment of the slats and flaps until the airspeed is reduced below
230 knots.
Vol. 1 11--60--2
FLIGHT CONTROLS
Flaps and Slats REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Slats/ Flaps Control System
Figure 11---60---1
EMER FLAP
SWITCH
SFECUs
SLAT ANGLE
GEARBOXES
SLAT PDU
SLAT
ACTUATORS
SLAT BPSU
FLAP BPSU
FLAP
ACTUATORS
FLAP PDU
FLAP ANGLE
GEARBOXES
SLAT/FLAP CONTROL LEVER
Vol. 1 11--60--3
FLIGHT CONTROLS
Flaps and Slats REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Slats/ Flaps --- Control
Figure 11---60---2
Gates are provided at positions 8 and 20.
Lever must be pushed downward to
overcome gate when moving rearward
from position 20 to position 30 and
when moving forward from
position 8 to position 1.
Clacker indicates that
airspeed is too high for
selected flap setting.
NOTE
Vol. 1 11--60--4
FLIGHT CONTROLS
Flaps and Slats REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Emergency Flap Deploy Control Panel
Figure 11---60---3
EMER FLAP
Used to operate the slats
and flaps in the event of a
control lever failure.
Emergency Flap Deploy Control
Center Pedestal
Slats/ Flaps Position --- Flight/Control Synoptic Page
Figure 11---60---4
Slat Position Readout
Indicates slat position in degrees.
Green -- Normal operation.
White -- Surface mismatch.
Amber dashes -- Invalid data.
Flap and Slat Outlines
Green -- System fully operational.
White -- System at half speed.
Amber -- System failed.
Half Intensity Magenta -- Invalid data.
Flight Controls Page
SLATS or FLAPS HALFSPEED (white)
Indicates that one channel of the
respective system has failed.
Flap Position Readout
Indicates flap position in degrees.
Green -- Normal operation.
White -- Surface mismatch.
Amber dashes -- Invalid data.
Vol. 1 11--60--5
FLIGHT CONTROLS
Flaps and Slats REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Slats/ Flaps EICAS Indication <1001>
Figure 11---60---5
FLAPS FAIL
SLATS FAIL SLATS FAIL caution (amber)
Indicates that both slat channels have failed.
FLAPS FAIL caution (amber)
Indicates that both flap channels have failed.
Flap Position Readout
Indicates flap position in degrees.
Green -- Normal operation.
White -- Flaps miscompare is detected.
Two amber dashes -- Invalid data.
Slats/Flaps Position Bar
Displays slat and flap deployment.
Green -- Normal operation.
White -- Miscompare is detected.
No Bar -- Position data is missing or invalid.
White markers along bar represent detents.
SLAT FAULT status (white)
Indicates that left or right slat disconnect
sensor has detected a mismatch.
FLAPS EMER advisory (green)
Indicates that emergency flap
switch is in deploy position.
FLAP FAULT status (white)
Indicates that emergency flap switch
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