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CSP 700−6
Volume 2
10−10−17
STABILIZER TRIM
The stabilizer trim control system provides pitch trim by varying the angle of incidence of the
horizontal stabilizer. The system consists of two Flight Control Units (FCUs), dual channel Motor
Drive Unit (MDU) and a dual electric channel trim actuator which drives a screw jack assembly to
position the horizontal stabilizer.
The pilot controls consist of switches on each control column and one horizontal stabilizer trim panel.
Pilot trim commands have priority and will override copilot trim command inputs. The horizontal
stabilizer can be trimmed from 2 degrees airplane nose down to 12 degrees nose up.
The FCUs are responsible for the monitoring of the trim system. They have their own dedicated
interfaces with other airplane systems and with pilot/copilot controls to perform trim control and
monitoring. The horizontal stabilizer system provides two redundant channels in an active/standby
basis such that full performance requirements can be met with either channel.
Pitch Trim Input
The FCUs receive inputs from the following systems:
· Integrated Avionic Computer (IACs).
· Air Data Computer (ADCs).
· Automatic Flight Control System (AFCS).
· STAB switches.
· Pitch trim and disconnect switches.
For manual stabilizer trim control, the FCUs receive commands from the pilot and copilot trim
switches. To perform the Mach trim function, the FCUs receive the airplane mach number from
three ADCs. Two IACs which comprise the AFCS function provide stabilizer trim command when
the autopilot is engaged. The ADCs provide mach data used for mach trim and rate scheduling.
The FCUs in turn command the MDUs to drive the motors of the horizontal stabilizer trim
actuators. The FCUs monitor the results of the command inputs to ensure correct control trim rate
and direction is achieved.
The Stab trim switches on the STAB control panel send signals to the FCUs for engagement and
disconnect. These switches also send a signal direct to the MDU to ensure disconnect of the
applicable trim actuator.
Stabilizer Actuator Assembly
Refer to Pitch Trim Schematic
The actuator assembly positions the surface in response to electrical signals from the MDU. The
stabilizer is positioned by a jack screw driven by electric trim motors within the actuator assembly.
The actuator assembly has brakes which provide a secondary means of preventing creeping in
flight under aerodynamic loads. A sensor mounted on each motor sends signals to the MDU to
determine each motor position.
FLIGHT CONTROLS
Flight Crew Operating Manual REV 41, Jul 08, 2004
CSP 700−6
Volume 2
10−10−18
STABILIZER TRIM (CONT'D)
Pitch Trim Schematic
FCU 1
ADC 1 (BUS 1)
ADC 2 (BUS 1)
ADC 3 (BUS 1)
FCU 2
ADC 1 (BUS 2)
ADC 2 (BUS 2)
ADC 3 (BUS 2)
MODULE 1 A MODULE 1 B MODULE 2B MODULE 2A
MOTOR CONTROL
AND MONITORING
MOTOR CONTROL
AND MONITORING
MOTOR
CHANNEL 2
TRIM
Sensor
Sensor
AND
BRAKE
MOTOR
AND
BRAKE
ACTUATOR
CHANNEL 1
PILOT TRIM AND
DISCONNECT
SWITCHES
COPILOT TRIM AND
DISCONNECT
SWITCHES
to FCU 2
to FCU 1
IAC −2
(AUTOPILOT)
IAC −1
(AUTOPILOT)
MOTOR
DRIVE
UNIT
GF1010_022
STAB
CH1 CH2
PUSH OFF/RESET
OFF OFF
FLIGHT CONTROLS
REV 41, Jul 08, 2004 Flight Crew Operating Manual
CSP 700−6
Volume 2
10−10−19
STABILIZER TRIM (CONT'D)
Stabilizer Trim Control Switches
The STAB trim control switches are located on the flight control trim panel (centre pedestal). For
normal operations, both switches are normally released (not pushed in) and remain dark. A white
“OFF” legend is displayed only when the switch is selected. This action will disconnect the channel
from the trim system and will remain disconnected as long as the switch has been selected.
STAB Switches
Used to disconnect each channel
of the trim system or reset certain
latched transient faults.
Selecting the switch will disengage
the pitch trim channel and the
"OFF" light will illuminate.
GF1010_023
STAB
CH1 CH2
PUSH OFF/RESET
OFF OFF
Failure monitoring within the FCU provides automatic failure detection and transfer to the opposite
channel, along with disabling of the channel detected as failed.
Manual Pitch Trim
The horizontal stabilizer trim is commanded through trim switches located on the pilot and copilot
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