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Vol. 1 03--20--1
REV 56, Jan 31/03
AUTOMATIC FLIGHT CONTROL SYSTEM
Flight Control and Guidance
Flight Crew Operating Manual
CSP A--013
MASTER
1. FLIGHT CONTROL AND GUIDANCE
Integration among the various avionics systems is provided by the integrated avionics
processing system (IAPS) which is a computer card cage located in the avionics
compartment. Two flight control computers (FCC’s), 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 within the two FCCs.
The FCC’s use altitude and heading reference system (AHRS) 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.
The FCC’s 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. <0025>
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.
REV 56, Jan 31/03
Vol. 1 03--20--2
AUTOMATIC FLIGHT CONTROL SYSTEM
Flight Control and Guidance
Flight Crew Operating Manual MASTER
CSP A--013
The PFD’s indicate the following AFCS information:
S Flight director modes and status
S Autopilot modes and status
S Elevator, stabilizer, and aileron trim failures
S Yaw damper disengagement
S Alternate and common source selections (attitude reference, air data reference and
display control panel selection)
S Flight director system monitor status.
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
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 (ADI), to fly the aircraft 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 ADI portion of the PFD’s.
The flight director system provides commands to perform the following:
S Hold a desired attitude
S Maintain a pressure altitude
S Hold a vertical speed
S Hold a Mach number or indicated airspeed
S Capture and maintain a preselected barometric-corrected altitude
Vol. 1 03--20--3
REV 56, Jan 31/03
AUTOMATIC FLIGHT CONTROL SYSTEM
Flight Control and Guidance
Flight Crew Operating Manual
CSP A--013
MASTER
S Capture and track a preselected heading
S Capture and track a preselected radio course (VOR, LOC,GS)
S Capture and track a localizer and glideslope to establish Category 2
S Maintain a wings-level, fixed pitch-up attitude for go-around
S Provide windshear escape guidance.
NOTE
When the autopilot is in IAS or vertical speed mode
with the flight director engaged, the flight director may
command excursions beyond VMO/MMO.
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