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failure. The MFS surfaces use a proximity sensor to detect that the surface is retracted.
The FCU provides monitoring of the PCU command, PCU response to the command,
spoiler surface through the proximity sensor, and detection of interface electrical
failures.
When an MFS panel failure is detected, the opposite panel will automatically be
disabled, in order to ensure lift dumping remains symmetrical.
Ground Spoilers
An electrically controlled ground spoiler selector valve is used to provide hydraulic
pressure to single actuators (at each panel), to either retract or extend a left or right pair
of ground spoilers.
The FCU must energize two valves within the ground spoiler selector valve for a pair
of ground spoilers to deploy. Proximity sensors are used for monitoring and indication,
and to detect whether a ground spoiler panel is retracted or not.
The actuators at each ground spoiler panel incorporate a hydraulic lock to prevent
upfloat in the event of a hydraulic failure. Each of the two FCUs controls and monitors
one of the two pairs of ground spoilers.
1 1
2 2
3 3
4 4
GX_10_051
FCU 1 FCU 2
OUTBRD OUTBRD INBRD INBRD
GROUND
SPOILER
SELECTOR
VALVE 1
GROUND
SPOILER
SELECTOR
VALVE 2
MODULE
1A
MODULE
1B
MODULE
2B
MODULE
2A
MULTIFUNCTION SPOILERS
MULTIFUNCTION SPOILERS
GROUND
SPOILERS
GROUND
SPOILERS
For Training Purposes Only
Sept 04
10-55
P I LOT T R A I N I N G GU I D E
FLIGHT CONTROLS
STALL PROTECTION
The Stall Protection System (SPS) provides the flight crew with aural, visual and feel
(stick shaker) indications of an impending stall and, if no corrective action is taken, the
system activates the stick pusher mechanism, preventing the airplane from entering the
stall.
The stall protection system consists of two (electrically anti-iced) angle-of-attack
sensors, a dual-channel computer, two stick shakers, a stick pusher system, and mach
sensing to back up the air data computers. Each channel of the computer controls a
stick shaker. The computer provides two independent signals to the pusher system
logic. Both channels of the computer have to agree to activate the stick pusher system
based on similar system inputs.
The stall protection function is inhibited when both weight-on-wheels inputs indicate
on ground or calibrated airspeed is recognized to be less than 70 knots.
The stall protection computer continuously monitors the SPS, and faults detected are
sent to EICAS for aural and/or visual annunciation.
STALL PROTECTION COMPONENTS
The stall protection system consists of the following components:
ANGLE-OF-ATTACK (AOA) VANE
Two AOA vanes are mounted on the forward fuselage (left and right) of the airplane.
They rotate to align with the prevailing airflow to measure the direction of the airflow
relative to the fuselage.
GX_10_052
AOA VANE
P I LOT T R A I N I N G GU I D E
FLIGHT CONTROLS
10-56 For Training Purposes Only
Sept 04
The vanes provide information to both channels of the stall protection computer. There
are self-regulating heaters (controlled and monitored by the Heater and Brake
temperature Monitor Unit (HBMU)) located in the vanes. The heaters provide the
sensors with an anti-icing capability.
MACH TRANSDUCER
The mach transducer control is installed on the right side of the flight compartment,
below the copilot’s side console. It is connected to the pitot-static system through a
selector/isolator switch. The mach transducer receives electrical input and pressure
through connectors, and supplies secondary mach information to the channels of the
Stall Protection Computer (SPC). The ADCs supply primary mach data to the
channels of the SPC.
The mach transducer is operated in the pitot-static position, and is used to cross check
for errors from the micro air data computer system. This is accomplished by providing
dissimilar source for mach number, airspeed, and altitude inputs.
STICK SHAKER ACTUATOR
A stick shaker (mechanical vibratory device) actuator is located on each control
column and provides tactile sensing, simulating airplane buffeting.
The stick shakers consist of a high speed motor, and the actuators are controlled from
the SPC channels.
MACH TRANSDUCER
PITOT
CLOSED
STATIC
CLOSED
GX_10_053
Mach Transducer
Selector
Normal operation is
selection in the
pitot/static position.
GX_10_054
STICK
SHAKER
STICK
SHAKER
STALL
PROTECTION
　
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