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from the trim system, and will remain disconnected as long as the switch has been selected.
Failure monitoring within the FCUs provides automatic failure detection and transfer to the
opposite channel. Disabling of the failed channel will also automaticaly occur.
Pitch Trim Modes of Operation
The pitch trim operating priorities are shown in the table below:
PRIORITY MODE
1 Manual trim command − pilot switches
2 Manual trim command − copilot switches
3 Automatic trim − autopilot (A/P 1 or 2)
4 Mach trim − available only if A/P off
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.
FLIGHT CONTROLS
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
10−10−23
STABILIZER TRIM (CONT'D)
Stabilizer Trim Display (Cont’d)
− 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
message or "CONFIG STAB TRIM"
warning message.
Position Pointer/digital readout
Moves vertically (in 0.1 units)
along the scale to indicate the trim
setting.
NU TRIMS
ND
STAB
NU TRIMS
ND
STAB
3.5
7.2
GF1010_028
NU
ND
VERTICAL SCALE LONG TICK MARKS SHORT TICK MARKS
Between 0 units (bottom) and
14 units (top)
0 and 14 unit positions 3.5, 7 and 10.5 units
GREEN BAND TAKEOFF
GREEN BAND −
Between 4.5 and 11 units Replaces the 7 and 10.5 marks
Stabilizer In Motion Aural Warning
The stabilizer in motion aural clacker signals operation of the horizontal stabilizer under the
following conditions:
· Operation of more than 3 seconds at a rate used for manual trim (0.2 degrees per second or
greater).
OR
· More than 6 seconds at a low rate above the mach trim rate (.08 degrees per second or
greater).
CONFIGURATION WARNING
Horizontal stabilizer trim position and condition is continuously monitored and any fault detected is
displayed on EICAS.
FLIGHT CONTROLS
Flight Crew Operating Manual Rev 2A, Apr 11, 2005
CSP 700−5000−6
Volume 2
10−10−24
STABILIZER TRIM (CONT'D)
SPLRS/STAB In Test
An advisory message “SPLRS/STAB IN TEST” will be displayed when the spoilers and stab trim
systems are performing selftest
once hydraulics are applied. The horizontal stabilizer system is
inoperative through the duration (approximately 20 seconds) of the test. Refer to the EICAS
MESSAGES in the spoiler section of flight controls for the message display.
FLIGHT CONTROLS
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
10−10−25
FLIGHT CONTROL INVALID DATA DISPLAYS
FLIGHT CONTROLS
AILERON
POSITION
INVALID
RUDDER/POSITION
INVALID
ELEVATOR POSITION
INVALID
Invalid data
SLAT INVALID
FLAP INVALID
SPOILER INVALID
AILERON SURFACE
HYDRAULIC PRESSURE
NOT AVAILABLE
Flight Control Synoptic Page
SPOILER POSITION
VECTOR
GF1010_010
SLAT
FLAP − −
− − −
ELEV
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