Originally Posted by
gearlever
Will the stick shaker on 737-800 be activated if CPT or FO pitot blocked?
Yes. A faulty airspeed or AOA input will cause the bad side Stall Management Yaw Damper (SMYD) computer to generate a stall signal. This stall signal will then initiate four system responses:
- Bad side stick shaker
- Speed Trim Stall ID function (trims stab nose down, but not as aggressively as MCAS)
- Elevator Feel Shift Mechanism - increases elevator control forces
- Autoslats - slats will go to full extend with any amount of flaps extended.
All of these functions are useful in a true stall, but can create unnecessary distractions when the stall condition is erroneous. There is no compare function between sides, so one faulty input can create this cascade of system effects in addition to the other challenges of an Airspeed Unreliable scenario.