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CSP 700−5000−6
Volume 2
10−10−39
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 2A, Apr 11, 2005
CSP 700−5000−6
Volume 2
10−10−40
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.
· Deployed or retracted position.
Spoilers position and condition is continuously monitored and any fault detected is displayed on
EICAS.
FLIGHT CONTROLS
SLAT OUT
FLAP 30
AIL
ELEV
RUDDER
AIL
ELEV
FLIGHT CONTROLS
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
10−10−41
SPOILER PRIMARY EICAS DISPLAY
Spoiler operation can be monitored when the popup
window is displayed on the primary EICAS
page.
Spoilers Display
Multifunction
and ground spoilers
are shown in the deployed position.
GF1010_051
GEAR
OUT
30
DN DN DN
ND
STAB
NU
NL RUDDER
LWD RWD
NR
TRIMS
7.2
AIL
The following are examples of spoiler configurations displayed on the primary EICAS page:
FLIGHT CONTROLS
Flight Crew Operating Manual Rev 2A, Apr 11, 2005
CSP 700−5000−6
Volume 2
10−10−42
FLIGHT SPOILER CONTROL LEVER
The flight spoiler control lever (FSCL) located in the centre pedestal (flight compartment) is the input
handle which controls the MFS surfaces for lift dumping in flight. Markings on the mounting plate are
illuminated by integral lighting located in the lever. The FSCL includes four sensors to transmit input
lever command to the FCUs.
The MFS may be extended to any position, between 0 and FULL, as required for the intended flight
path. The MAX position is used for emergency descent whereby all MFS deploy if flaps are retracted
to zero degrees. The FSCL unlatch selector located on top of the FSCL must be pressed to release
the lever from the zero position and from the FULL to MAX position. If the flaps are not retracted,
only the inboard MFS are available for lift dump and the MAX selection will have no effect.
GND LIFT DUMPING/AUTOBRAKE CONTROL PANEL
The panel is located in the centre pedestal (flight compartment) and is used to manually arm or
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