*Note- The alternate pitch trim levers should NOT be used with the autopilot engaged, or during stall/overspeed protection. Will the Alternate Pitch Trim Levers disconnect the autopilot? ![]() They have priority over control wheel pitch trim commands in ALL FLIGHT MODES. They send trim speed commands to the PFCs in NORMAL MODE, and move the stabilizer in all modes. In Normal mode, how do the Alternate Pitch Trim Levers operate? The speed at which the airplane will eventually stabilize if there are no control column inputs. When trim inputs are made, the PFCs automatically move the elevators to achieve trim change and then move the stabilizer to streamline the elevator. On the ground-The pilot is able to directly control the stabilizer position using the pitch trim switches In Flight-The pitch trim switches do not position the stabilizer directly, but make inputs to the PFCs to change the trim reference speed. Normally with dual pitch trim switches on each control wheel.ĭo the pitch trim switches move the control column?ĭo the pitch trim switches have any effect when the autopilot is engaged?Įxplain how the primary pitch trim switches operate. How is Primary pitch trim manually controlled? In Secondary Mode, what is the associated EICAS message? ![]() Yaw Dampening (may be degraded or inoperative) Envelope Protection (bank angle, overspeed, ,stall, )Ĩ. The following features and protections are lostĥ. The elevator and rudder may be more sensitive at some airspeeds. What is the net result of the system going into SECONDARY mode?Īll flight controls still function normally. When the PFC's can no longer support the normal mode due to- internal faults or lack of required information from other airplane systems they automatically revert to the secondary mode. What causes the flight controls to go from NORMAL to SECONDARY mode? When the PFCs can no longer support the Normal mode due to internal faults or lack of required information from other airplane systems they automatically revert to the secondary mode. How do the flight controls revert to the secondary mode? ![]() When the PFC (Primary Flight Control) switch is in AUTO and there are no other malfunctions, what flight control mode are we in? Only available when flight controls are in the NORMAL modeĮngine surges if unable to determine an accurate thrust level When is the TAC (Thrust Asymmetry Compensator) available? Click here to study/print these flashcards.Ĭreate your own flash cards! Sign up here.
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