CHAPTER 3 --- AUTOMATIC FLIGHT CONTROL SYSTEM - SmartCockpit
[Pages:32]AUTOMATIC FLIGHT CONTROL SYSTEM Table of Contents
Vol. 1 03--00--1
REV 3, May 03/05
CHAPTER 3 --- AUTOMATIC FLIGHT CONTROL SYSTEM
Page
TABLE OF CONTENTS Table of Contents
INTRODUCTION Introduction
FLIGHT CONTROL AND GUIDANCE Flight Control and Guidance Flight Director Synchronization Flight Mode Annunciator Lateral Modes of Operation Vertical Modes of Operation Altitude Alert System System Circuit Breakers
AUTOPILOT Autopilot
03 -- 00 03--00--1
03 -- 10 03--10--1
03 -- 20 03--20--1 03--20--2 03--20--7 03--20--8 03--20--9 03--20--12 03--20--16 03--20--18
03 -- 30 03--30--1
LIST OF ILLUSTRATIONS
FLIGHT CONTROL AND GUIDANCE
Figure 03--20--1
Flight Control Panel -- Layout
Figure 03--20--2
Flight Director -- Schematic
Figure 03--20--3
Flight Director -- Controls and Indications
Figure 03--20--4
Course Pointer Control and Indication
Figure 03--20--5
FD Synchronization
Figure 03--20--6
Flight Mode Annunciator
Figure 03--20--7
AFCS EICAS Indications
AUTOPILOT Figure 03--30--1
Figure 03--30--2
Figure 03--30--3 Figure 03--30--4
Figure 03--30--5
Autopilot -- Schematic Autopilot -- General Autopilot -- Controls Autopilot -- PFD Flags Autopilot -- EICAS Messages
03--20--1 03--20--3 03--20--5 03--20--6 03--20--7 03--20--8 03--20--17
03--30--2 03--30--3 03--30--4 03--30--6 03--30--7
Flight Crew Operating Manual CSP C--013--067
AUTOMATIC FLIGHT CONTROL SYSTEM Table of Contents
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Sep 09/02
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Flight Crew Operating Manual CSP C--013--067
AUTOMATIC FLIGHT CONTROL SYSTEM Introduction
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1. INTRODUCTION
The automatic flight control system (AFCS) provides integration of the autopilot and flight director systems. The system consists of two interlinked flight control computers, an autopilot, two yaw dampers, automatic elevator trim control and assorted servos and actuators.
The flight control computer receives mode selections from the flight control panel and sensor 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.
Flight Crew Operating Manual CSP C--013--067
AUTOMATIC FLIGHT CONTROL SYSTEM Introduction
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REV 3, May 03/05
AUTOFLIGHT
INTEGRATED AVIONICS
PROCESSING SYSTEM (IAPS)
AUTOMATIC FLIGHT CONTROL SYSTEM (AFCS)
FLIGHT CONTROL COMPUTER
(FCC) DIAGNOSTICS
FLIGHT DIRECTOR
AUTOPILOT
YAW DAMPER
AUTO TRIM
CRUISE MODES
ROLL PITCH
HDG ALT SEL
VOR
ALT HOLD
FMS
CLIMB MODES
ROLL PITCH
HDG VOR FMS
VS SPD
PITCH
DESCENT MODES
ROLL PITCH
HDG
PITCH
VOR
VS
LOC
SPD
FMS
GO--AROUND MODES
ROLL
PITCH
HDG
10 DEGREES
ROLL HOLDNOSE UP
TAKEOFF MODE
ROLL PITCH
WINGS
LEVEL HDG
HOLD
NOSE UP DEGREES VARIES WITH SPEED AND FLAP SETTING
APPROACH MODES
ROLL PITCH
LOC
GS
VOR
FMS
Auto Flight Systems and Modes --- General Figure 03---10---1
Flight Crew Operating Manual CSP C--013--067
AUTOMATIC FLIGHT CONTROL SYSTEM Flight Control and Guidance
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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.
The flight control panel is the mode selection panel for selecting and controlling the flight director and autopilot functions.
Autopilot Panel Contains switches to couple, uncouple, transfer control and reduce gains on the autopilot.
Flight Control Panel Center Glareshield
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 --- Layout Figure 03---20---1
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
Flight Crew Operating Manual CSP C--013--067
AUTOMATIC FLIGHT CONTROL SYSTEM Flight Control and Guidance
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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:
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
S Capture and track a preselected heading
S Capture and track a selected navigation source (VOR, LOC, G/S or FMS)
S Capture and track a localizer and glideslope
S Maintain a wings-level, fixed pitch-up attitude for takeoff or go-around
S Provide windshear escape guidance
Flight Crew Operating Manual CSP C--013--067
AUTOMATIC FLIGHT CONTROL SYSTEM Flight Control and Guidance
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FCP
FD SYNC SWITCH
FD SYNC SWITCH
PILOT CONTROL WHEEL
PFD 1
IAPS
COPILOT CONTROL WHEEL
PFD 2
FCC 1 FLIGHT DIRECTOR
FUNCTION
FCC 2 FLIGHT DIRECTOR
FUNCTION
Flight Director --- Schematic Figure 03---20---2
Flight Crew Operating Manual CSP C--013--067
AUTOMATIC FLIGHT CONTROL SYSTEM Flight Control and Guidance
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Flight directors are simultaneously turned on by either selecting a vertical mode, selecting a lateral mode, or by engaging the autopilot. Flight director selection activates all flight control mode annunciations and presents steering commands for the selected mode(s). When both flight directors are turned on, by engaging the autopilot, basic modes (pitch and roll) are automatically selected. When both flight directors are turned on, by selecting a vertical or lateral mode, basic modes are automatically selected for the other axis.
Transfer mode controls the routing of flight guidance commands to the autopilot and flight directors. When transfer mode is selected, the copilot's flight guidance command drives both flight directors. When not transferred, the pilot's flight guidance command drives both flight directors.
Flight Crew Operating Manual CSP C--013--067
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