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The slat/flap/gear extension speed bugs are displayed as illustrated below.
The slat/flap/gear extension speed bugs are displayed in a fixed position on the
airspeed tape, and will go out of view beyond the end of the airspeed tape.
NOTE
Speed bugs are only displayed at 18,000 feet and below, or with
Slat/Flap/Gear out.
The slat/flap/gear extension speed symbols are as follows:
GX_10_036
240
250
240
230
220
210
200
190
180
215
6
4
SO SO Slats OUT / Flaps 0° - 225 knots.
F F Flaps extended 6°/16° - 210 knots.
LO LO Landing Gear in Operation - 200 knots.
F3 F3 Flaps Extended 30° - 185 knots.
P I LOT T R A I N I N G GU I D E
FLIGHT CONTROLS
10-40 For Training Purposes Only
Sept 04
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 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 lift dumping. The FSCL 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 systems 1
and 2. To prevent lift asymmetry, a failed panel will automatically disable the
corresponding symmetric panel on the opposite wing.
The GSs (inboard spoilers) deploy on ground only as part of the ground lift dumping
function. The GSs are controlled symmetrically to either the fully extended or fully
retracted position through hydraulically powered PCUs, one per surface. The GSs are
hydraulically powered by hydraulic systems No. 1 and 3. Hydraulic supply for PCU
operation is provided by an electrically controlled selector valve. Extension of a pair
of GSs 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.
GX_10_037
Multifunction
Spoilers
(4 per wing)
Ground Spoilers
(2 per wing)
For Training Purposes Only
Sept 04
10-41
P I LOT T R A I N I N G GU I D E
FLIGHT CONTROLS
The GS together with the MFSs 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 non-retracted surface and no deployment has been
commanded, an EICAS message will be displayed on the EICAS page.
Spoiler Functions
The spoiler system performs the following:
• ROLL ASSIST - by asymmetric deployment of up to four pairs of MFS to
augment aileron control. The surface deflection is a function of the handwheel roll
angle (derived from the average of two sensors) compensated for airspeed and flap
position. Right wing down command deploys the right spoilers, left remain
stowed. Left wing down deploys the left spoilers, right spoilers remain stowed
• PROPORTIONAL LIFT DUMPING - by symmetric deployment of up to four
pairs of MFS commanded by the FSCL. Proportional lift dumping and roll
commands are mixed to provide differential right and left MFS deployment. Four
pairs of MFS are available when the flaps are fully retracted. Two pairs (inboard)
of MFS will deploy at low altitude when the flaps are in any of their extended
position detents. Under this condition the outboard MFS will be available for roll
assistance only
• GROUND LIFT DUMPING - through the symmetric full extension of all spoilers
upon landing or during a rejected takeoff. At initial touchdown with at least one
left or right main landing gear indicating on-ground (wheels spinning up), the two
pairs of GS deploy first. The deployment of the two pairs of MFS is delayed (until
weight on wheels) for continued roll control
• COMBINATION ROLL ASSIST AND PROPORTIONAL LIFT DUMPING -
MFS control mixes the roll command and proportional lift dumping command. To
command a handwheel command and a FSCL command, spoiler deployment of
　
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