During testing, the stall warning system (stick shaker attached to the yoke) and stall protection system (stick pusher
that provides automatic stall recovery) were evaluated.
With the flight plan in the Apex system (see sidebar), preparation for departure is stunningly simple: Trims are set, 15 degrees of flap selected and the stick pusher and shaker tested--that's it.
Full flaps, 40 degrees, provides substantial drag so flying out of a stick pusher event, with full power applied smartly, still requires the sacrifice of a few hundred feet to accelerate out of the near stall speed regime and establish a climb.
While descending in icing conditions, the crew allows their airplane to get slow enough the stick pusher
EASA today issued a Transport Canada airworthiness directive (AD) for Bombardier CRJ700 and CRJ900-series regional jets equipped with certain part number Thales angle-of-attack (AOA) transducers, devices that provide information for the aircraft's stall warning, stick shaker and stick pusher
A direct result of the crash of the BAC 1-11 prototype discussed above was the incorporation of a "stick pusher
," which later became a common feature on most similar airliners, among other design changes.