In order to comply with regulatory requirements, aircraft designers may opt to install a system that will constantly monitor the critical parameters and will automatically activate to reduce the angle of attack when necessary to avoid a stall.
[4] In addition to regulatory pressure, various aircraft manufacturers have endeavoured to devise their own improved stall protection systems, many of which have included the stick shaker.
[6] Amongst other aircraft Boeing were involved in the development of, the 300 Series of the De Havilland Canada Dash 8 regional airliner was equipped with this system.
[7] Textron Aviation developed their own arrangement for its Citation Longitude business jet, opting to automate the aircraft's augmented pusher system via its integration with the computerised autopilot, thus eliminating the need to involve any electro-mechanical mechanisms.
[7] To unfamiliar flight crew, the activation of the stick pusher can feel particularly abrupt, vigorous and alarming, but this is an intended and normal part of its functionality to ensure it takes effect before a serious stall sets in.
[16] During the 2000s, there was a series of accidents that were attributed, at least in part, to their flight crews having made improper responses to the activation of the stick pusher.
[1][17] During the early 2010s, in response to this wave of accidents, the Federal Aviation Administration (FAA) issued guidance urging operators to ensure that flight crews are properly training on the use of stick pushers.