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Flight Crew Operating Manual Rev 2A, Apr 11, 2005
CSP 700−5000−6
Volume 2
10−10−20
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
control columns. The switches command airplane nose up or nose down movement of the actuator
with a controlled trim rate dependent on the airplane Mach number.
Master Disconnect Switch
Provides a disconnect command to
the AFCS and disconnects the
pitch trim function and stall pusher
while the switch is held.
Stabilizer Trim Lever Switches
Enables pilot to vary stabilizer trim
according to flight requirement.
Both levers must be pushed fully
up or fully down to activate the
pitch trim.
NOTE
The pilot control column is shown:
copilot’s is similar.
GF1010_024
FLIGHT CONTROLS
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
10−10−21
STABILIZER TRIM (CONT'D)
Manual Pitch Trim (Cont’d)
The manual trim rate is 0.5 degree per second at low Mach number and decreases gradually to
0.25 degree per second as the Mach number increases above 0.5M.
FCU 1
FCU 2
STABILIZER TRIM
ACTUATOR
MOTOR 1
MOTOR 2
CH 1
CH 2
MDU
PILOT/COPILOT
TRIM SWITCHES
GF1010_025
Mach Trim
The Mach trim system provides longitudinal stability using Mach speed information from the ADCs
and varies the angle of incidence of the horizontal stabilizer by commanding the horizontal
stabilizer actuator. Mach trim provides automatic compensation of airplane pitching with changes
of Mach number. The trim rate follows a schedule dependent on Mach number. The Mach number
is transmitted to the FCUs from the airplane ADCs which pass command signals to the MDU.
The Mach trim authority ranges from 0.5° nose up at 0.85 Mach to 1.8° nose up @ 0.9 Mach. The
trim rate varies between 0.03 and 0.06 degree per second as Mach increases.
Mach trim is disabled when the Automatic Flight Control System(AFCS) is engaged.
ADC 1
ADC 2
FCU 1
FCU 2
STABILIZER TRIM
ACTUATOR
MOTOR 1
MOTOR 2
CH 1
CH 2
MDU MACH TRIM
GF1010_026
Automatic Pitch Trim
In the auto mode, the Mach trim input are inhibited. When automatic flight is engaged, the trim
system will take its commands from the AFCS. The AFCS function is performed by the Integrated
Avionics Computers (IACs). The FCUs receive motor commands from the AFCS through the IACs,
then pass the command signals to the MDU. Trim rate and motion is received by the AFCS and
monitoring is also performed in the FCU.
AUTOPILOT
ENGAGE
FUNCTION
IAC 1
IAC 2
FCU 1
FCU 2
STABILIZER TRIM
ACTUATOR
MOTOR 1
MOTOR 2
CH 1
CH 2
MDU
MONITOR SIGNAL
TRIM/RATE SIGNAL
GF1010_027
CRS 2
Manual trim has priority over autopilot pitch trim and mach trim. If the pilot or copilot trim switches
are activated with the AFCS engaged, the FCU will generate a signal causing the AFCS to
disengage. The automatic pitch trim rate operation is from 0.5 to 0.015 degree per second.
FLIGHT CONTROLS
Flight Crew Operating Manual Rev 2A, Apr 11, 2005
CSP 700−5000−6
Volume 2
10−10−22
STABILIZER TRIM (CONT'D)
Pitch Trim Schematic
Stabilizer Trim Control Switches
The STAB trim control switches are located on the flight control trim panel (center 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
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