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The following represents slat and flap configurations in both serviceable and failure conditions.
FLIGHT CONTROLS
Flight Crew Operating Manual REV 41, Jul 08, 2004
CSP 700−6
Volume 2
10−10−34
SLAT/FLAP OPERATION
Both SFCU 1 and 2 receive input signals from the slat/flap control lever. The SFCUs then release the
brakes from the motor drive units of the PDUs and asymmetry brake detectors. The PDU powers the
driveline and actuators to achieve slat/flap travel.
The position sensors return signals to the SFCUs to confirm correct operation of speed, rotation and
position. Each SFCU sends signals to FCUs 1 and 2 which process this logic for system(s) operation.
SLAT/FLAPS SCHEMATIC
FLIGHT CONTROLS
REV 41, Jul 08, 2004 Flight Crew Operating Manual
CSP 700−6
Volume 2
10−10−35
FLAP/SLAT/GEAR EXTENSION SPEED BUGS
The flap/slat/gear extension speed bugs are displayed as a sideways letter “T”, as illustrated
below.
The flap/slat/gear extension speed bugs are displayed in a fixed position on the airspeed tape and
will go out of view beyond the ends of the airspeed tape.
NOTE
Speed bugs are displayed at 18,000 feet and below or with
Flap/Slat/Gear out.
The flap/slat/gear extension speed symbols are as follows:
250
240
230
220
210
200
190
180
240
215
6
4
FLIGHT CONTROLS
Flight Crew Operating Manual REV 41, Jul 08, 2004
CSP 700−6
Volume 2
10−10−36
SLAT/FLAP EICAS MESSAGES
CONFIG SLAT/FLAP
SLATFLAP
FAULT
SLATFLAP
FAIL
SLATFLAP
HALFSPD
SLAT DRIVE OVHT
FLAP DRIVE OVHT
SLATFLAP
BIT
SLATFLAP
FAULT
"NO TAKEOFF"
SLATFLAP
HALFSPD
SLATFLAP
BIT
SLATFLAP
FAIL
FLIGHT CONTROLS
REV 41, Jul 08, 2004 Flight Crew Operating Manual
CSP 700−6
Volume 2
10−10−37
SPOILER SYSTEM
There are four MultiFunctional
Spoiler (MFS) panels and two Ground Spoiler (GS) panels located on
the upper surface of each wing, just forward of the flaps. MFS and GS position is shown on the
EICAS primary and flight control synoptic pages.
A Flight Spoiler Control Lever (FSCL) in the flight compartment is used to control the MFS
symmetrically for in flight dumping and provides input to the two FCUs to control the
extension/retraction of each MFS panel. Deployment angle is proportional to the position of the
FSCL. When the flaps are retracted, all four pairs of MFS are available for lift dumping: with the flaps
extended, only the two inboard pairs are used.
The MFS panels provide roll assistance, in flight lift dumping (speed brakes) and ground lift dumping.
They are also used as a backup
to the ailerons, in the event of an aileron failure. The MFSs are
electrically controlled by the FCUs which actuate hydraulic PCUs, one per surface. The MFSs are
hydraulically powered by # 1 and 2 systems. To prevent lift asymmetry, a failed panel will
automatically disable the corresponding symmetric panel on the opposite wing.
MULTIFUNCTION
SPOILERS (4 PER
WING)
GROUND SPOILERS
(2 PER WING)
The GS (most inboard spoilers) deploy on ground only as part of the ground lift dumping function.
The GS are controlled symmetrically to either the full extended or full retracted position through
hydraulically powered PCUs, one per surface. The GS are hydraulically powered by #1 and 3
systems. Hydraulic supply for PCU operation is provided by an electrically controlled selector valve.
Extension of a pair of GS is controlled by energizing two solenoid valves in the selector valve.
Retraction occurs as soon as electrical power is removed from one (or both) solenoids which control
valve movement.
The GS together with the MFS are used to dump lift and increase drag to assist other braking
systems on landing or in the event of a rejected takeoff.
Each spoiler surface is equipped with one
proximity sensor to detect when the surface is retracted. When a proximity sensor indicates a
nonretracted
surface and no deployment has been commanded, an EICAS message will be
displayed on the primary page.
FLIGHT CONTROLS
Flight Crew Operating Manual REV 41, Jul 08, 2004
CSP 700−6
Volume 2
10−10−38
SPOILER SYNOPTIC DISPLAY
The deployment position of all spoilers is shown on the EICAS primary page and flight controls page.
When there is no spoiler deployment, all EICAS spoiler icons disappear. Symbology at each spoiler
panel display:
· Spoiler panel status.
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