Operation Manual Part 2

Aerosoft – Digital Aviation
CRJ-70 & CRJ-900
AOM PART 2
Systems Description
VOL
5
5-1-55
26-Jul-2017
STALL PROTECTION SYSTEM
As previously mentioned a stall needs to be prevented any time. Accordingly, all aircraft are equipped with at
least a stall warning. The CRJ is equipped with a stall warning and a stick pusher – both together are called the
stall protection system. The angle of attack (AoA) is monitored throughout all flight phases and as soon as the
AoA reaches a critical value the stall computer warns the crew by:
- Activating the stick shaker
- Activates the engines auto-ignition system (to prevent flameout)
- Disengages the autopilot
In case the angle of attack continues to approach the stall point, the stick pusher is activated. The stick pusher
moves the steering column forward to command a nose down attitude to gain speed and prevent the stall.
The STALL PTCT PUSHER switch engages and disengages the stick pusher system.
The STALL pushbutton (guarded) flashes red when the aircraft is approaching
stall conditions. When pushed on the ground it will initiate the stall test
sequence:
• Auti-ignition activated
• Pilot Stick shakers activated for 3 seconds
• Co-Pilot Stick shakers activated for 3 seconds
• After 7 seconds stick pusher is activated
• Stall light flashes
• Press AP/DISC to verify the stick pusher disengages and stall warning are
off.