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Elevator Control General Arrangement
Elevator Control System
Two separate pitch control systems are provided: the pilot’s side operates the left-hand elevator and the copilot’s side operates the right-hand elevator. Normally, both control systems are interconnected through a torque tube assembly and there is simultaneous movement of both elevators.
Elevator Control System Operation
The pilot and copilot pitch controls are interconnected through a pitch disconnect mechanism used to maintain the control wheels connected, until a design torque is developed across the mechanism.
NOTE
The AFCS (autopilot) should be disconnected if a jammed elevator control circuit condition occurs.
Volume 2 Flight Crew Operating Manual Rev 2A, Apr 11, 2005
ELEVATOR CONTROL (CONT'D)
Elevator Control System Operation (Cont’d)
A jammed elevator control circuit can be isolated through automatic activation of the pitch disconnect mechanism. This procedure will allow limited pitch control using one elevator through the operable control circuit.
A control rod located at the base of each column transmits pilot command to the left and right forward quadrants. The left forward quadrant includes a cable interface with the stick pusher servo of the stall protection system.
The cable circuits travel independently from the forward quadrant to the aft quadrant located in the vertical stabilizer. A separate cable circuit is provided for the autopilot servo motor assembly which inputs the right aft quadrant.
Disconnecting the autopilot by the pilot overpowering the pitch servo will not cause the auto pitch disconnect system to separate the control columns.
NOTE
Overpowering the servo to disconnect the autopilot is not recommended.
Two electrical actuators positioned at the pitch feel simulator provides input to the aft quadrant for force feel requirements. The actuators receive command input from the FCUs based on airspeed and horizontal trim position.
The aft quadrants drive a series of control rods and levers which input a torque tube assembly to positions the hydraulic PCUs. Two PCUs are used for each elevator.
Elevator Surface Position Indication
Left and right elevator positions are displayed by a moving pointer on the FLIGHT CONTROLS page on EICAS. Separate pointers indicate the left and right elevator surface positions.
Surface OutlineScale Pointer
The surface outline has noUnfilled triangle moves movement. It will changevertically to indicate the color (magenta, green orrange of travel.
amber) based on electricalThe surface position power (ie: battery only or allpointer will change color busses powered), and(green or amber) based hydraulic pressure availability.
on hydraulic pressure
availability.
GF1010_019
SCALE LONG TICK MARKS SHORT TICK MARKS
Left side .22.5° (top) at top and bottom at 0°
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