Pitch Wheel; Turn Knob - Honeywell SPZ-8000 Maintenance Manual

The controller provides the means of manually controlling the autopilot
through the TURN knob and PITCH wheel. The following paragraphs describe
each control.
7. C. (1)
Pitch Wheel
- Rotation of the pitch wheel results in a change of
pitch attitude proportional to the rotation of the
wheel and in the
direction of wheel movement. The pitch wheel provides rate limited
pitch commands in pitch hold mode. The pitch thumb wheel provides
dual tachometer outputs which are applied to both flight guidance
computers to ensure fail-passive pitch wheel operation. Pitch wheel
operation is inhibited in GS, FLCH, VS, and VNAV modes.
(2) TURN Knob - Rotation of the TURN knob out of detent results in a
roll command. The roll angle is proportional to and in the
direction of the TURN knob rotation. The TURN knob controls dual
detent switches and potentiometers to provide identical roll
commands to both flight guidance computers. The TURN knob must be
in detent (center position) before the autopilot can be engaged.
Rotation of the TURN knob cancels any lateral mode selected.
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Page 198.59/198.60
Aug 15/91
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