(10)
Stabilizer Trim/Rudder Ratio Module
D. The pitch axis control of the Flight Control Computers (FCCs) controls the pitch axis of the airplane through three seperate Elevator Autopilot Servos (EASs). Flight director pitch axis guidance commands are also provided by the pitch channel.
E. Each EAS receives electrical command signals from the FCCs. These signals are converted to hydraulic commands via the electrohydraulic servovalves which are mounted on each EAS. The output crank of each EAS is linked to the aft torque tube by an adjustable control rod. The control columns are also mechanically linked to the aft torque tube, providing the pilots with the ability to override the autopilot system when sufficient force is applied to the control column. For a detailed description of the Elevator Control System, refer to 27-31-00/001.
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SELECTVERTICAL SWITCH/LIGHT SWITCH/LIGHT KNOB
NAVIGATION SWITCH/LIGHT
AFCS MODE CONTROL PANEL (MCP)
FLIGHT CONTROL COMPUTER (FCC)
AP/FD Pitch Axis Control Component Location
Figure 1 (Sheet 1)
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ELEVATOR AUTOPILOT SERVO (EAS)-L
ELEVATOR AUTOPILOT SERVO INSTALLATION
SEE C
ELEVATOR AUTOPILOT
SERVO (EAS)-C
ELEVATOR AUTOPILOT SERVO (EAS)-R
FWD
AFT QUADRANT TORQUE TUBE
ELEVATOR AUTOPILOT SERVO INSTALLATION C AP/FD Pitch Axis Control Component Location Figure 1 (Sheet 2)
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ELECTRICAL AUTOPILOTCOMMAND COMMANDS PRODUCEPROCESSING
HYDRAULICALLY ACTUATED DIGITAL
MECHANICAL OUTPUTS
SYNCHRONIZATION MECHANICAL
ANALOG
TO ELEVATOR
PRE-ENGAGE TEST
IDENTICAL AND
INTERCHANGEABLE
WITH EAS-R AND
EAS-C
FCC-L (E1-1) EAS-L (AFT OF STAB BOX COMPT)
FUNCTIONALLYAUTOPILOT IDENTICAL TOENGAGEMENT FCC-L
MODE
SELECTION
MCP (P10)
FCC-C (E1-3) EAS-C (AFT OF STAB BOX COMPT)
FUNCTIONALLY IDENTICAL TO FUNCTIONALLY FCC-L IDENTICAL TO EAS-L
EAS-R (AFT OF STABFCC-R (E1-4)BOX COMPT)
Pitch Component Functional Interface
Figure 2
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FLIGHT CONTROLCOMPUTER
FCC Pitch Axis - Control Inputs and OutputsFigure 3
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F. The autopilot modes which provide commands to the pitch axis are:
(1)
Vertical Speed (V/S) - AFDS provides single channel AP/FD commands to acquire and hold the vertical speed selected on the MCP.
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