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Volume 2
10−10−25
PRIMARY/SECONDARY FLIGHT CONTROL EICAS MESSAGES (CONT'D)
SPLRS/STAB BIT
Indicates that a fault
has been recognized
by the flight control
unit (maintenance
action before the next
scheduled check). This
message appears only
on the ground.
STAB CH 12
FAIL
Indicates that channel 1
or 2 failed.
STAB CH 12
OFF
Indicates that the affected
pitch trim off switch
(centre pedestal) has
been selected to the OFF
position.
PITCH FEEL FAULT
Indicates that either
pitch feel is inoperative
or degraded (force
gradient not nominal) on
one or both channels.
STAB CH 12
FAIL
PITCH FEEL FAULT
SPLRS/STAB BIT
STAB CH 12
OFF
FLIGHT CONTROLS
Flight Crew Operating Manual REV 41, Jul 08, 2004
CSP 700−6
Volume 2
10−10−26
SLAT/FLAP CONTROL SYSTEM
The slat and flap control system is an integrated electromechanical
system which operates both
slats and flaps from a single flight compartment control lever. The flap and slat control systems are
mechanically independent. Each system is comprised of actuators, linked through a rigid driveline, to
a central Power Drive Unit (PDU). Each PDU incorporates dual electric motor/brake assemblies. The
slats and flaps will continue to operate at half speed with a single motor operating.
Asymmetry brakes for both flaps and slats are installed to provided driveline braking in the event of
shaft failures. Dual sensors are located at the outboardmost
ends of the driveline. They are used by
the control units for system positioning and fault monitoring. Position sensors are located next to
each flap actuator to provide position feedback to the control units.
The slats are extended first if both slat and flap extension is required. The flaps are retracted first if
both slat and flap retraction is required.
Two Slat/Flap Control Units (SFCUs) control the operation of the slats and flaps. Electrically there
are two independent channels for slats and two independent channels for flaps. Each SFCU controls
and monitors the flaps and slats independently of the other unit. Each SFCU controls one slat PDU
motor and asymmetry brake and one flap PDU motor and asymmetry brake. System control provides
protection against asymmetry and uncommanded movement.
Slat/Flap System Schematic
SLAT/FLAP
CONTROL
LEVER
DRIVELINE SLAT SYSTEM
SLAT SYSTEM
FLAP SYSTEM
FLAP SYSTEM
SFCU 1 SFCU 2
GF1010_034
FLIGHT CONTROLS
REV 41, Jul 08, 2004 Flight Crew Operating Manual
CSP 700−6
Volume 2
10−10−27
SLAT CONTROL SYSTEM
The slat system has four leading edge slat panels with two actuators per slat panel connected to a
slats Power Drive Unit (PDU), linked through a rigid driveline (torque tubes/bearings) and controlled
by the slat/flap handle position. The PDU is driven by two DC motors connected together in a speed
sum configuration. Each motor is controlled by a single channel SFCU. There is a brake on each slat
motor that is also controlled by the SFCU. The PDU provides protection against an overload and jam
condition. To protect against asymmetry, there are dual coil brakes and position sensors located on
each outboard station, left and right, that interface with both SFCUs.
The slats are antiiced
and automatically controlled by the ice detection system. Telescopic ducting is
installed between the inboard fixed leading edge and the outboard slats for antiicing.
Refer to
Chapter 14 for additional information on the antiicing/
bleed system.
Slat System Schematic
SLAT/FLAP
CONTROL
LEVER
SLAT SYSTEM
POWER DRIVE UNIT
DRIVELINES
SFCU 1 SFCU 2
GF1010_035
The slat position and surface position is displayed on the EICAS FLIGHT CONTROL synoptic
page. Slat indication is also shown on the EICAS PRIMARY PAGE.
FLIGHT CONTROLS
Flight Crew Operating Manual REV 41, Jul 08, 2004
CSP 700−6
Volume 2
10−10−28
SLAT CONTROL SYSTEM (CONT'D)
Slat Position and Surface Indications
Failure annunciations
can be displayed
above the SLAT label
Slat Position Indication Slat Surface
Slat/Flap surfaces retracted Slat/Flap surfaces extended
GF1010_036
FLIGHT CONTROLS
SLAT IN
FLAP 0
AIL
ELEV
RUDDER
AIL
ELEV
FLIGHT CONTROLS
SLAT OUT
FLAP 30
AIL
ELEV
RUDDER
AIL
ELEV
Slat Position Indication and Surface color
If the slats are at commanded position, the slat position indication and slat surface
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