Originally Posted by
gearlever
Thx Tomaski.
I always thougt the airbus is a complex beast.....
Hopefully all 737-800 jocks will know about the stall warning design of their bird.
Days are obviouly gone when a stick shaker was a stall warning just by an AoA vane (B727, A300), no computers which may get it wrong.
On the 737NG and later, pitot-static and AOA inputs are processed through independent (left & right) Air Data Inertial Reference Units (ADIRU's) to generate a computed airspeed (CAS) which is displayed on the Primary Flight Display (PFD). The ADIRU's also sends data to the SMYD's (also left & right) which then manages the stall and yaw damper functions. Again, there is no comparator function between left and right sides, so one bad input on one side is all it takes to get the ball rolling. Even if the crew determines that the stall signal is erroneous, there is no published procedure to cancel the various system responses.