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Rev 2A, Apr 11, 2005 Flight Crew Operating Manual Volume 2
ELEVATOR CONTROL (CONT'D) Elevator Control Schematic 
STICK SHAKER  STICK SHAKER 
STALL PROTECTION SYSTEM STICK PUSHER  PITCH DISC 

AUTOPILOT SERVO COMMANDS
HORIZONTAL STABILIZER
PITCH FEEL UNIT POWER CONTROLELEVATORS UNIT
ELEV ELEV
RUDDER

LEGEND
FLIGHT CONTROL

Electrical input

SYNOPTIC PAGE
Mechanical input
Cable input
GF1010_021
Volume 2 Flight Crew Operating Manual Rev 2A, Apr 11, 2005

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 (0 units on EICAS) airplane nose down to 12 degrees (14 units on EICAS) 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.
　
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