PPRuNe Forums - View Single Post - Continental TurboProp crash inbound for Buffalo
Old 15th Feb 2009, 16:57
  #283 (permalink)  
Deano777
 
Join Date: May 2003
Location: Somewhere In The South China Sea
Posts: 960
Likes: 0
Received 0 Likes on 0 Posts
Yes Conan.

The Stick Pusher System, Stick Shaker System and the flap auto pitch trim system.

The Stall protection system consists of 2 SPMs or Stall Protection Modules and uses the following parameters to calculate when the a/c is near a stall condition:

AoA data
Flap Position
EAS
Engine Torque
Icing Status

Both SPMs are used to calculate the Stick Pusher operating angle using the following parameters:

AoA
Flap Position
EAS
Power Lever Angle
Condition Lever Angle
Icing Status.

The SPMs calculate when to operate the Shaker & Pusher systems and sends a signal to the Automatic Flight Control System to disengage the autopilot, also for Stick Pusher activation it uses an average of the 2 AoA vane inputs.

Stick pusher operates under these conditions

CAS is less than 215kts
Altitude is +200ft AGL
Stick Pusher shutoff annunciator switch is not in the off position.
Deano777 is offline