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information from the air data system, navigation systems, inertial reference system, radio
altimeter and surface position sensors. The flight control computer provides flight guidance
commands to the autopilot. The autopilot provides the control signals to drive the aileron
and elevator servos as well as the horizontal stabilizer trim. The flight director provides
visual guidance using a command bar on the attitude director indicator portion of the primary
flight displays. <1025>
Vol. 1 03--10--2
AUTOMATIC FLIGHT CONTROL SYSTEM
Introduction REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Auto Flight Systems and Modes --- General
Figure 03---10---1
AUTOFLIGHT
FLIGHT DIRECTOR AUTOPILOT YAW DAMPER
AUTO TRIM
INTEGRATED
AVIONICS
PROCESSING
SYSTEM (IAPS)
AUTOMATIC
FLIGHT CONTROL
SYSTEM (AFCS)
FLIGHT CONTROL
COMPUTER
(FCC) DIAGNOSTICS
ALT SEL
ALT HOLD
CRUISE MODES
ROLL PITCH
HDG
VOR
FMS
PITCH
VS
SPD
DESCENT MODES
ROLL PITCH
HDG
VOR
LOC
FMS
10 DEGREES
NOSE UP
GO--AROUND MODES
ROLL PITCH
HDG
ROLL HOLD
VS
SPD
PITCH
CLIMB MODES
ROLL PITCH
HDG
VOR
FMS
TAKEOFF MODE
ROLL PITCH
WINGS
LEVEL
HDG
HOLD
GS
APPROACH MODES
ROLL PITCH
LOC
VOR
FMS
NOSE UP
DEGREES
VARIES WITH
SPEED AND
FLAP SETTING
Vol. 1 03--20--1
AUTOMATIC FLIGHT CONTROL SYSTEM
Flight Control and Guidance REV 1, Jan 13/03
Flight Crew Operating Manual
CSP C--013--067
1. FLIGHT CONTROL AND GUIDANCE
Integration among the various avionics systems is provided by the integrated avionics
processing system (IAPS) which is located in the avionics compartment. Two flight control
computers (FCCs), mounted inside the IAPS, are the main computers for the automatic flight
control system (AFCS). Control logic for the dual flight directors, the two axes autopilot with
automatic pitch trim and the dual yaw dampers is contained in the two FCCs. The FCCs use
the inertial reference system (IRS) and air data computer (ADC) system information to
calculate flight path and control parameters for the AFCS. Other inputs to the flight control
computers include selections made on the flight control panel, flight management computer
outputs and radio system outputs. <1025>
The flight control panel is the mode selection panel for selecting and controlling the flight
director and autopilot functions.
Flight Control Panel --- Layout
Figure 03---20---1
Flight Director and
Course Selector Panels
Contains switches to
select basic pitch and roll
modes (when not coupled)
and set course on primary
flight display.
Mode Indicators
When a mode switch is pressed,
a mode request is sent to the
on--side flight control computer.
If conditions are within limits, the
computer acknowledges by
illuminating the green lights
adjacent to the mode switch.
The primary flight display
indicates the selected mode.
Flight Control Panel
Center Glareshield
Autopilot Panel
Contains switches
to couple, uncouple,
transfer control and
reduce gains on the
autopilot.
Using the flight control panel, the crew can select the following functions:
S Remove flight director cues from the primary flight display and revert to basic pitch and roll
displays
S Set course and fly to the active navigation source
S Engage, disengage and transfer control of the autopilot
Vol. 1 03--20--2
AUTOMATIC FLIGHT CONTROL SYSTEM
Flight Control and Guidance REV 1, Jan 13/03
Flight Crew Operating Manual
CSP C--013--067
S Reduce autopilot gains
S Set and maintain airspeed, vertical speed, and altitude
S Set navigation, heading selection and approach modes
A. Flight Director
The flight director provides visual guidance, by means of command bars on the attitude
director indicator, to fly the airplane manually or to visually monitor autopilot response to
the guidance commands. The visual guidance commands (pitch and roll control) are
integrated with the AFCS modes, selected on the flight control panel, for autopilot
operation. AFCS operating modes can be selected to the flight directors with the
autopilot disengaged. Pitch (including speed control) and roll guidance cues from the
AFCS are displayed on the attitude director indicator portion of the primary flight
displays.
The flight director system provides commands to perform the following:
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