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FMS Navigation Mode ...................................................................................................... 4-22
ILS Approach Mode .......................................................................................................... 4-23
FMS Approach Mode ........................................................................................................ 4-24
Back Course Mode ........................................................................................................... 4-25
Lateral Takeoff Mode ........................................................................................................ 4-26
Lateral Go-Around Mode .................................................................................................. 4-27
Pitch Mode ........................................................................................................................ 4-28
Altitude Capture Sequence ............................................................................................... 4-29
Altitude Alert Annunciations .............................................................................................. 4-30
Altitude Hold Mode............................................................................................................4-31
Vertical Speed Mode......................................................................................................... 4-32
Flight Level Change Mode ................................................................................................ 4-33
FLC Overspeed Protection Mode ..................................................................................... 4-34
AUTOMATIC FLIGHT CONTROL SYSTEM
4-iv For Training Purposes Only
Sept 04
P I LOT T R A I N I N G GU I D E
Vertical Takeoff Mode ....................................................................................................... 4-35
Vertical Go-Around Mode ................................................................................................. 4-36
Reversionary/Inhibit Panel ................................................................................................ 4-37
Flight Control Panel (FCP) - Autopilot/Flight Director Modes ........................................... 4-38
Flight Control Panel (FCP) - Flight Director Lateral Modes .............................................. 4-39
Flight Control Panel (FCP) - Flight Director Vertical Modes ............................................. 4-40
Cockpit Switches - Autopilot / Flight Director Function ..................................................... 4-41
PFD Annunciations ........................................................................................................... 4-42
AUTOMATIC FLIGHT CONTROL SYSTEM
For Training Purposes Only
May 03
4-1
P I LOT T R A I N I N G GU I D E
CHAPTER 4: AUTOMATIC FLIGHT CONTROL SYSTEM Introduction
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 dual two-axis autopilots, 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 pilot 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.
AUTOMATIC FLIGHT CONTROL SYSTEM
4-2 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
Flight Control Computers (FCCs)
Description
The Integrated Avionics Processor System (IAPS) contains four Flight Control
Computers (FCCs) which provide the flight director, autopilot and yaw damper
functions.
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.
Operation
The FCCs provide output data to the following:
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