Operation Manual Part 2

Aerosoft – Digital Aviation

CRJ-70 & CRJ-900

AOM PART 2

Systems Description

VOL

5-1-21

26-Jul-2017

AUTOPILOT

The installed autopilot is a two-axes, digital, fail-passive autopilot. It commands input to the ailerons, elevators

and rudder via the flight control computers, FCCs.

To activate the autopilot the following requirements need to be fulfilled:

• All flight control computers (FCC) are operative

• At least one channel of horizontal trim is available

• At least one yaw damper is engaged

• At least one IRS system is available

• At least one air data computer (ADC) is available

• No significant instability of the aircraft

When flying through turbulent weather autopilot’s corrective signals might reduce passenger comfort. By

selecting the turbulence mode, the intensity of signals is reduced to smooth aircraft motion. Turbulence mode

is automatically cleared as soon as a localizer is captured. The autopilot is activated with the AP ENG

pushbutton and can be deselected by the AP DISC push bar.

The autopilot can also be disengaged by any of the following

controls.

1. Push AP/SP DISC switch on control when – this

equals the autopilot disengage button / key

assignment within FS.

2. Push the AP ENG switch on the flight control panel

3. Lower the AP DISC switch-bar on the right flight control panel

4. Operating the stabilizer trim

5. Pressing the TOGA switch on the thrust levers

6. Disengaging yaw damper by pressing the DISC pushbutton on the yaw damper panel

Disengagement of the autopilot is indicated by an aural warning (cavalry charge) and the AP indications on the

PFDs turns red. After two repetitions of the cavalry charge the warning is cancelled automatically.

Automatic disengagement of the autopilot occurs:

• In case both yaw dampers are disengaged or fail

• In case a failure in the FCC monitoring circuit is detected (not simulated)

• In case a stall warning is triggered

• During a windshear and the subsequent clearance procedure.

It automatically disconnects approx. 2 seconds after the windshear warning

In case the autopilot is disengaged automatically, the following warnings (aural and flashing red AP indication

on the PFD) may be cancelled by pressing the AP/SP DISC switch or either TOGA switch.