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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.
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.
Volume 2 Flight Crew Operating Manual Rev 2A, Apr 11, 2005
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 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:
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 TAKE-OFF”aural warning and is displayed during the take-off roll if the stabilizer trim is set outside the allowable take-off range.
The color of the pointer and digital readout is dependent on system status:
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WHITE . On ground or during take-off if the horizontal stabilizer trim is trimmed outside the take-off range (green band).
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GREEN . Operative and when on the ground or during take-off, trimmed within the take-off range.
When the airplane is on the ground or during take-off, the trim take-off range is displayed as a green band within the white scale. In flight, the complete scale reverts to green.
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual Volume 2
STABILIZER TRIM (CONT'D)
Stabilizer Trim Display (Cont’d)
Green Band (take.off)
NU . Nose Up.ND . Nose Down. Top and bottom of the scale.
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