Pitch Axis and Trim

The autopilot pitch axis uses pitch rate to stabilize the aircraft pitch attitude during upsets and flight director maneuvers. Flight director pitch commands are rate- and attitude-limited, combined with pitch damper control, and sent to the pitch servo motor. The pitch servo measures the output effort (torque) and provides this signal to the pitch trim adapter. The pitch trim adapter runs to reduce the torque held by the pitch servo. Additionally, the pitch trim system automatically compensates during flaps deployment and adjustment.

190-03123-21 Rev A
July 2026