CONTROL WHEEL
PITCH TRIM SWITCH (SPRING-LOADED TO NEUTRAL)
Trims the airplane when the autopilot is not engaged.
If only half of the switch is actuated for more than 7 seconds, the switch will be automatically deactivated.
Manual pilot trim commands are limited to 3 seconds.
CONTROL WHEEL COMMUNICATIONS SWITCH
PTT (momentary): allows VHF transmissions, as well as voice communications to passengers.
HOT: allows communication between crewmembers and ramp station.
OFF: allows only audio reception.
AP/TRIM DISCONNECT BUTTON
Trim
Press and Hold the AP/TRIM DISC Button
It disconnects the autopilot and stops any active trim command.
Release the AP/TRIM DISC Button
Re-activates the trim commands.
Autopilot
Normal means of disengaging the autopilot.
Pressing once disengages the autopilot.
Second press cancels the autopilot aural alarm and FMA AP warning.
TOUCH CONTROL STEERING BUTTON (TCS)
Press and Hold the TCS:
Synchronizes the Flight Director with the current airplane attitude.
Momentarily overrides the autopilot if it is engaged.
Release the TCCCS:
The Flight Director returns to the lateral and vertical selection when the TCS was pressed.
With Roll/VS/FPA modes the FD re-syncs the aircraft to the current attitude when TCS is released.
Autopilot resumes airplane control if the autopilot is engaged.
STEERING DISENGAGE SWITCH
Located on the back of the control yoke.
Disengages the nosewheel steering system.
FREE WHEEL STEERING MODE
Used for towing or when the normal steering system fails.
Steering system can be disengaged reverting to free wheel by:
Steering disengage switch on yoke.
External steering disengage switch located on the external power connection access.
Steering can be carried out by use of rudder, differential brake and/or asymmetrical thrust.
TOWING
Safe to tow when the following indications are visible:
Green light on the nose gear.
Parking brake ON light extinguished.
STEER OFF EICAS displayed.
Green towing light on nosewheel illuminates when:
Steering is disengaged
Parking brake is not set
Toe brakes are not applied
Red guarded steering switch on the forward ramp panel disengages the nosewheel steering.
CHRONOMETER BUTTON
Starts/stops/resets the chronometer displayed on the PFD.
Independent information/function for each control wheel.
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