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Modes 04−10−45
Figure 04−10−40 Flight Control Panel (FCP) − Flight Director Lateral Modes 04−10−46
Figure 04−10−41 Flight Control Panel (FCP) − Flight Director Vertical Modes 04−10−47
Figure 04−10−42 Cockpit Switches − Autopilot/Flight Director Function 04−10−48
Figure 04−10−43 PFD Annunciations 04−10−49
AUTOMATIC FLIGHT CONTROL SYSTEM
Table of Contents
Vol. 2 04−00−3
REV 74, Nov 07/08
CL−604 Operating Manual
PSP 604−6
Page
AUTOMATIC FLIGHT CONTROL SYSTEM
Table of Contents
Vol. 2 04−00−4
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
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GENERAL
The automatic flight control system (AFCS) on the Challenger 604 is a subsystem of the Collins Pro
Line 4 Avionics System. It is a fully integrated flight control system that includes a dual two-axis
autopilot, each with integrated dual flight directors, dual yaw dampers, and automatic pitch trim
control. The flight control system consists primarily of the following equipment:
• Four flight control computers
• One flight control panel
• Aileron and elevator servos
• Two linear actuators for the rudder (yaw damping)
The flight control computers (FCCs) receive pilots input from the selections made on the flight control
panel (FCP). Electronic signals from the FCCs send guidance commands to the aileron and elevator
servos, the yaw damper linear actuators, and the horizontal stabilizer trim control unit (HSTCU).
When the autopilot is engaged, the AFCS maneuvers the aircraft while the pilot monitors the flight
path by observing the flight guidance information presented on the EFIS primary flight display (PFD).
When the autopilot is disengaged, the pilot manually flies the aircraft in response to guidance
provided by the flight director (FD) command bars on the PFD.
FLIGHT CONTROL COMPUTERS
Description
The FCCs process information from the inertial reference system (IRS), air data computers
(ADCs), navigational (NAV) systems and various cockpit control panels, to calculate flight path and
flight guidance parameters.
Components and Operation
Each FCC is capable of generating independent flight director commands.
The FCCs provide output data to the following:
• Flight control panel
• Flight directors on the PFDs
• Autopilot servomotors (elevator, aileron)
• Yaw damper actuators
• Pitch trim, horizontal stabilizer trim control unit (HSTCU)
Each AFCS uses the following FCCs:
• AFCS 1 – FCC 1A and 2A
• AFCS 2 – FCC 1B and 2B
Only one system of FCC pairs (AFCS 1 or AFCS 2) can be active at any time. The inactive system
is on standby and a manual selection is required to switch from AFCS 1 to AFCS 2, or vice versa.
The AFCS SEL switch on the REVERSIONARY/INHIBIT panel selects the active pair of FCCs
(AFCS 1 or AFCS 2) that provide steering commands to the aileron and elevator servos, and to
the HSTCU.
AUTOMATIC FLIGHT CONTROL SYSTEM
Description
Vol. 2 04−10−1
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
FLIGHT CONTROL COMPUTERS (CONT'D)
Integrated Avionics Processing System (IAPS)
The integrated avionics processing system (IAPS) is a physical housing (card cage) containing
the four flight control computers (FCCs) and other avionics systems computers and modules.
The IAPS provides power to the avionics components and enables these components to
communicate with each other and with aircraft systems.
AUTOMATIC FLIGHT CONTROL SYSTEM
Description
Vol. 2 04−10−2
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
FLIGHT CONTROL COMPUTERS (CONT'D)
Automatic Flight Control System Configuration
Figure 04−10−1
AUTOMATIC FLIGHT CONTROL SYSTEM
Description
Vol. 2 04−10−3
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
FLIGHT CONTROL COMPUTERS (CONT'D)
Flight Control Panel (FCP)
The flight control panel (FCP) is the mode selection panel that control the flight director and
autopilot functions. The FCP is located on the glareshield, and is accessible to both pilots.
Flight Control Panel
Figure 04−10−2
FCC Status Indicator Lights
There are two green status indicator lights, one on either side of each mode button. When a
pilot selects an FCP button, the request is sent to both active FCCs (1A and 2A, or 1B and 2B).
　
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