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Vol. 1 03--20--18
AUTOMATIC FLIGHT CONTROL SYSTEM
Flight Control and Guidance REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
AFCS EICAS Indications <1001>
Figure 03---20---7
AFCS MSG FAIL warning (red)
Indicates all AFCS (IAPS) data
busses are invalid.
IAPS DEGRADED status (white)
Indicates that an IAPS bus has failed.
IAPS OVERTEMP status (white)
Indicates that an IAPS overtemperature
condition has been detected.
FD 1 or 2 FAIL status (white)
Indicates that the respective flight
director has failed.
SPEED REFS INDEP status (white)
Indicates that pilot and copilot vertical--
speed selection is not synchronized or
air data computer cross--talk has failed.
Primary Page
Status Page
Vol. 1 03--20--19
AUTOMATIC FLIGHT CONTROL SYSTEM
Flight Control and Guidance REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
G. System Circuit Breakers
SYSTEM SUB--SYSTEM CB NAME BUS BAR CB
PANEL
CB
LOCATION
NOTES
IAPS L DC BUS 1 1 H1
IAPS R DC BUS 2 H1
Automatic
Flight Control
IAPS
IAPS L FAN BATTERY
BUS P7
System
IAPS R FAN DC BUS 2 2 H3
IAPS L AFCS /
MDC
BATTERY
BUS P6
IAPS R AFCS DC BUS 2 H2
Vol. 1 03--20--20
AUTOMATIC FLIGHT CONTROL SYSTEM
Flight Control and Guidance REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
THIS PAGE INTENTIONALLY LEFT BLANK
Vol. 1 03--30--1
AUTOMATIC FLIGHT CONTROL SYSTEM
Autopilot Sep 09/02
Flight Crew Operating Manual
CSP C--013--067
1. AUTOPILOT
The automatic flight control system (AFCS) provides a two axes, digital, fail-passive
autopilot. The fail-passive autopilot system is protected against internal single hardware
faults and limits any malfunctioning commands to a response that is easily controlled by the
pilot. Command inputs to the ailerons and elevators are provided by servos controlled by
the flight control computers (FCCs). The FCCs input the yaw damper system to control the
rudder. The autopilot controls the aircraft in response to flight director commands by
actuating the appropriate control surfaces.
To engage the autopilot, the following is required.
S Both flight control computers must be operative
S At least one channel of the horizontal stabilizer trim is operative
S At least one yaw damper is engaged
S At least one IRS system is operable <1025>
S At least one air data computer (ADC) is operative
S There is no significant instability of the aircraft
Turbulence mode reduces autopilot gain so that flight control computer response to turbulent
flight conditions is slowed and aircraft motion is smoother. On approach, an on-side localizer
capture automatically clears the autopilot turbulence mode.
Vol. 1 03--30--2
AUTOMATIC FLIGHT CONTROL SYSTEM
Autopilot REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Autopilot Schematic <1015>
Figure 03---30---1
IAPS
AILERON SERVO ELEVATOR SERVO
PILOT
CONTROLWHEEL
COPILOT
CONTROLWHEEL
FCC 1
AUTOPILOT
FUNCTION
FCC 2
AUTOPILOT
FUNCTION
FCP
PFD 1 PFD 2
Vol. 1 03--30--3
AUTOMATIC FLIGHT CONTROL SYSTEM
Autopilot REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Autopilot --- General <1015>
Figure 03---30---2
Flight Control Panel
Center Glareshield
Primary Flight Display
Pilot’s and Copilot’s Instrument Panels
Green indicator lights on either
side of switch indicate engaged.
NOTE
Vol. 1 03--30--4
AUTOMATIC FLIGHT CONTROL SYSTEM
Autopilot REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Autopilot --- Controls
Figure 03---30---3
Flight Control Panel
AP DISC Center Glareshield
Lowering bar disengages autopilot.
Red line becomes visible.
Pilot’s Control Wheel
(Copilot’s Opposite)
AP / SP DISC (red)
When pressed, disengages
autopilot and deactivates
stick pusher. When
released, stick pusher
system is immediately
reactivated, but autopilot
remains disengaged.
CAVALRY
CHARGE
Take--Off/ Go--Around
(TOGA) Switches
Momentary pushbutton
switches associated with
the take--off/ go--around
mode of the flight director.
Yaw Damper Panel
Center Pedestal
DISC
Used to disengage
yaw dampers.
Vol. 1 03--30--5
AUTOMATIC FLIGHT CONTROL SYSTEM
Autopilot REV 3, May 03/05
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