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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
Flight Crew Operating Manual REV 41, Jul 08, 2004
CSP 700−6
Volume 2
10−10−20
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 is limited to 2 degrees of horizontal stabilizer movement and the trim rate
varies between 0.03 and 0.06 degree per second.
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
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
REV 41, Jul 08, 2004 Flight Crew Operating Manual
CSP 700−6
Volume 2
10−10−21
STABILIZER TRIM (CONT'D)
Stabilizer Trim Display
The EICAS primary page provides a full time display of the horizontal stabilizer trim position and
system status. The display is grouped with the display for the aileron and rudder trims. The
horizontal stabilizer trim position is represented by a pointer moving on a vertical linear scale. The
pointer includes a digital readout of the trim value. The range of stabilizer movement in degrees is
converted to units from 0 to 14 for the purpose of position display.
A “CONFIG STAB TRIM” red warning message is accompanied by a “NO TAKEOFF”
aural
warning and is displayed during the takeoff
roll if the stabilizer trim is set outside the allowable
takeoff
range.
The color of the pointer and digital readout is dependent on system status:
· WHITE − On ground or during takeoff
if the horizontal stabilizer trim is trimmed outside the
takeoff
range (green band).
· GREEN − Operative and when on the ground or during takeoff,
trimmed within the takeoff
range.
When the airplane is on the ground or during takeoff,
the trim takeoff
range is displayed as a
green band within the white scale. In flight, the complete scale reverts to green.
− Nose Up.
− Nose Down.
Top and bottom of
the scale.
Green Band (take−off)
Between 4.5 and 11 units.
Trim Scale
Pitch trim range for the
horizontal stabilizer
trim position indication.
The pointer/digital readout will turn
white with a "STAB TRIM" caution
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