# CONTROL WHEEL

### PITCH TRIM SWITCH (SPRING-LOADED TO NEUTRAL) <a href="#pitch-trim-switch-springloaded-to-neutral" id="pitch-trim-switch-springloaded-to-neutral"></a>

* Trims the airplane when the autopilot is not engaged.
* <mark style="color:red;">If only half of the switch is actuated for more than 7 seconds, the switch will be automatically deactivated.</mark>
* <mark style="color:red;">Manual pilot trim commands are limited to 3 seconds.</mark>

***

### CONTROL WHEEL COMMUNICATIONS SWITCH <a href="#control-wheel-communications-switch" id="control-wheel-communications-switch"></a>

* <mark style="color:red;">PTT (momentary): allows VHF transmissions, as well as voice communications to passengers.</mark>
* <mark style="color:red;">HOT: allows communication between crewmembers and ramp station.</mark>
* <mark style="color:red;">OFF: allows only audio reception.</mark>

***

### AP/TRIM DISCONNECT BUTTON <a href="#aptrim-disconnect-button" id="aptrim-disconnect-button"></a>

* <mark style="color:red;">Trim</mark>
  * <mark style="color:red;">Press and Hold the AP/TRIM DISC Button</mark>
    * <mark style="color:red;">It disconnects the autopilot and stops any active trim command.</mark>
  * <mark style="color:red;">Release the AP/TRIM DISC Button</mark>
    * <mark style="color:red;">Re-activates the trim commands.</mark>
* 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) <a href="#touch-control-steering-button-tcs" id="touch-control-steering-button-tcs"></a>

* 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.

<figure><img src="https://docs.flightsim-studio.com/api/document/image/6feebe9e-1ab0-40aa-9630-f011c6327528/cf68afad-4613-4cb5-a4aa-230cb6df6d2d/b71174bc-5558-4741-ae38-94537207cafd.png?width=320" alt=""><figcaption></figcaption></figure>

### STEERING DISENGAGE SWITCH <a href="#steering-disengage-switch" id="steering-disengage-switch"></a>

* <mark style="color:red;">Located on the back of the control yoke.</mark>
* <mark style="color:red;">Disengages the nosewheel steering system.</mark>

### FREE WHEEL STEERING MODE <a href="#free-wheel-steering-mode" id="free-wheel-steering-mode"></a>

* Used for towing or when the normal steering system fails.
* Steering system can be disengaged reverting to free wheel by:
  * <mark style="color:red;">Steering disengage switch on yoke.</mark>
  * <mark style="color:red;">External steering disengage switch located on the external power connection access.</mark>
* Steering can be carried out by use of rudder, differential brake and/or asymmetrical thrust.

### TOWING <a href="#towing" id="towing"></a>

* Safe to tow when the following indications are visible:
  * <mark style="color:red;">Green light on the nose gear.</mark>
  * Parking brake ON light extinguished.
  * <mark style="color:red;">STEER OFF EICAS displayed.</mark>
* <mark style="color:red;">Green towing light on nosewheel illuminates when:</mark>
  * <mark style="color:red;">Steering is disengaged</mark>
  * <mark style="color:red;">Parking brake is not set</mark>
  * <mark style="color:red;">Toe brakes are not applied</mark>
* <mark style="color:red;">Red guarded steering switch on the forward ramp panel disengages the nosewheel steering.</mark>

<figure><img src="https://docs.flightsim-studio.com/api/document/image/6feebe9e-1ab0-40aa-9630-f011c6327528/cf68afad-4613-4cb5-a4aa-230cb6df6d2d/8924b1a5-6c45-4f20-b2d0-c261333cfd41.png?width=466" alt="" width="466"><figcaption></figcaption></figure>

### CHRONOMETER BUTTON <a href="#chronometer-button" id="chronometer-button"></a>

* Starts/stops/<mark style="color:red;">resets</mark> the chronometer displayed on the PFD.
* <mark style="color:red;">Independent information/function for each control wheel.</mark>


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