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Bombardier-Challenger_01-Automatic_Flight_Control_System

 

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OPERATING HANUAL
PSP 601A-6
SECTION 4
AUTOMATIC FLIGHT CONTROL SYSTEM
TABLE OF CONTENTS
Page
1. GENERAL 1
A. Flight Director Function ]
B. Autopilot Function -4
C. Advisory Display 4
LIST OF ILLUSTRATIONS
Figure
Number Title Pag*
1 Automatic Flight Control System - Simplified Block Diagram 5
2 Flight Director Function Related Controls - Flight Guidance
Controller (3 sheets) 6
3 Flight Director Function Related Controls - Instrument Remote
Controllers 9
4 Flight Director Function Related Displays - EFIS EADI 10
5 Flight Director Function Related Failure Displays - EFIS EADI 11
6 Flight Director Function Related Displays - EFIS EHSI 12
7 Autopilot Function Related Controls - Flight Guidance Controller
(2 Sheets) 13
8 Autopilot Function Related Controls - Turn and Pitch Controller 15
9 Autopilot Function Related Controls - Remote Switches and
Annunciators (2 Sheets) 16
10 Autopilot Function Related Display - EFIS EADI 18
11 AFCS - Advisory Display 19
12 Advisory Display - Display Format 20
4 - CONTENTS
Page 1
Apr 02/87
OPERATING MANUAL
PS? 601A-6
Figure
Number
13
14
15
16
17
18
19
20
21
22
Advisory Display
Advisory Display
Advisory Display
Advisory Display
Advisory Display
Advisory Display
Advisory Display
Advisory Display
Advisory Display
Advisory Display
4 - CONTENTS
Page 2
Apr 02/87
Title Page
Flight Director Lateral and Vertical Arm Modes 21
Flight Director Lateral and Vertical Active Modes 21
SAT/TAT/TAS Displays 22
Warning Disengage Messages (Amber Flashing) 22
Caution Disengage Messages (Amber Steady) 23
Primary Caution Messages (Amber Steady) 23
Advisory Caution Messages (Amber Steady) 24
Sensor Failure Messages (Amber Steady) 25
AFCS Status Messages 25
Invalid Operation Messages (Amber Steady) 26
OPERATING MANUAL
PS? 601A-6
SECTION 4
AUTOMATIC FLIGHT CONTROL SYSTEM
1. GENERAL
The automatic f l i g h t control system (AFCS) processes actual a i r c r a f t attitude
versus desired a i r c r a f t a t t i t u d e to provide control of the a i r c r a f t ' s control
surfaces and to provide command signals for display on the e l e c t r i c a l f l i g ht
instrument system (EFIS).
The AFCS provides f l i g h t director guidance, autopilot and s t a b i l i ty
augmentation functions.
The AFCS consists of the f l i g h t guidance computer, the f l i g h t guidance
c o n t r o l l e r , the turn and p i t ch controller and the following associated systems:
D i g i t a l air data system (DADS), refer to Section 11
Radio altimeter system, refer to Section 16
I n e r t i a l reference system (IRS), refer to Section 16
Electronic f l i g h t instrument system (EFIS), refer to Section 11
Flight management system (FMS), refer to Section 16
A. Flight Director Function (Figures 1 through 6)
The f l i g h t director function produces lateral and vertical control command
signals for the autopilot function r o l l and pitch axis and also for display
on the EFIS. All f l i g h t director modes are selectable on the f l i g ht
guidance controller, with the exception of the go around (GA) mode, which
i s selected from the GA switches on the t h r o t t l e actuating levers.
SECTION 4
Page 1
Apr 02/87
ctianenc/er
OPERATING MANUAL
PS? 601A-6
The flight director roll (lateral) modes consist of the following:
Heading select mode (HDG)
VOR mode (NAV)
Lateral navigation mode (NAV)
Localizer mode (NAV)
Localizer approach mode (APP)
Back course mode (BC)
Preselect course approach mode
Category 2 mode (CAT 2)
The flight director pitch (vertical) modes consist of the following:
Pitch attitude hold mode
Vertical speed hold mode (VS)
Flight level change mode (FLO
Attitude old mode (ALT)
Altitude preselect mode (ALT SEL)
Glides lope mode (APP)
Dual couple approach mode
Vertical navigation mode (VNAV)
The flight director command signals are indicated on the pilot's and
copilot's EFIS electronic attitude director indicators (EADI) by the flight
director command bars. When the autopilot function is not engaged, the
command bars indicate to the pilot, the maneouvers required to maintain the
aircraft attitude for the selected flight director mode. When the
autopilot function is engaged, the command bars indicate the commands
followed by the autopilot function to maintain the aircraft attitude for
the selected flight director mode.
The pilot's and copilot's EADIs and the advisory display provide an
indication of the selected flight director mode(s). The modes are
displayed in green when active and in white when armed. Modes without
armed submodes are displayed in green only.
SECTION 4
Page 2
Apr 02/87
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OPERATING MANUAL
PSP 601A-6
On the pilots and copilot's EADIs, the flight director lateral and
vertical modes are annunciated as follows:
Lateral modes
HDG (captured only)
VOR (armed and captured)
BC (armed and captured)
LOC (armed and captured)
LNAV (armed and captured)
Vertical Modes
ASEL (captured only)
GS (armed and captured)
PLC (captured only)
VFLC (captured only)
VASL (captured only)
VALT (captured only)
VPTH (captured only)
VS (captured only)
ALT (captured only)
GA (captured only)
MACH (captured only)
When a flight director mode changes from armed to captured, the green mode
annunciation flashes for 5 seconds to indicate the submode transition.
The advisory display also provides an indication of the flight director
mode(s) selected (refer to paragraph l . C ).
The pilot's and copilot's electronic horizontal situation indicators (EHSI)
provide for lateral flight director mode set-ups, and the pilot's and
copilot's EADIs provide for vertical flight director mode set-ups. The
pilot's and copilot's EFIS instrument remote controllers provide the
controls for both the lateral and vertical flight director mode set-ups.
The lateral navigation (LNAV) and vertical navigation (VNAV) flight
director modes (VFLC, VASL, VALT and VPTH) are selected and set up on the
flight management system (refer to Section 11).
SECTION 4
Page 3
Apr 02/87
OPERATING MANUAL
PS? 601A-6
Autopilot Function (Figures 1 and 7 through 10)
The autopilot system responds to command signals from the flight director
function (refer to paragraph 2.), the flight guidance controller, the air
data system, the attitude and heading system and the accelerometers to
control the aircraft attitude in the pitch, roll and yaw axes.
When a vertical or lateral flight director mode is selected and the
autopilot function is engaged, the selected flight director steering
command is displayed on the EFIS and control is provided for the associated
servo-drive motors and linear actuators. These servo-drive motors and
linear actuators consist of two rudder linear actuators for yaw axis
control, a dual aileron servo for roll axis control and a dual elevator
servo for pitch axis control (refer to Section 10).
When the autopilot function is engaged without a selected flight director
mode, the autopilot function provides wings level, heading hold and pitch
hold mode functions, controlled from the turn and pitch controller.
The autopilot function also consists of a pitch trim function and a Mach
trim function.
The pitch trim function is automatically activated when the autopilot
function is engaged. The computed pitch trim command signal is applied to
the pitch trim system (refer to Section 10).
The Mach trim function is selected by pressing the M TRIM pushbutton on the
flight guidance controller (refer to Figure 2 (Sheet 3)). The computed
Mach trim command signal is applied to the pitch trim system (refer to
Section 10).
The EFIS electronic attitude director indicator (EADI) and the advisory
display (refer to paragraph l.C), provide an indication of the autopilot
status.
Advisory Display (Figures 11 through 22)
The advisory display provides warning, caution, status failure and invalid
operation messages, and air data and flight director mode status. Low
priority messages are inhibited during heavy work load periods, such as
take-offs and landings.
In addition to the display functions, the advisory display provides
controls for AFCS selection, message resetting and display brightness.
SECTION 4
Page 4
Apr 02/87
OPERATING MANUAL
PSP 601A-6
H A/C POST SB 601-035$ AND
A/C 5100 AND SUBS
FRONT REAR
COPILOrS CONTROL WHEEL
Automatic Flight Control System -
Simplified Block Diagram
Figure 1
SECTION 4
Page 5
Apr 10/95
cftauentjer
OPERATING MANUAL
PSP 601A-6
NAV PUSHBUTTON
When pressed, arms the lateral
guidance for capture of the selected
navigation course displayed on the
coupled EHSI.
BANK PUSHBUTTON
When pressed, selects the bank angle limit used during the HOG select mode.
At power on. the high bank limit (27 degrees) is selected. Pressing the BANK
pushbutton selects the low bank limit (17 degrees). Pressing the BANK
pushbutton a second time selects the high bank limit. The selected bank limit
is displayed on the advisory display (refer to Figure 14).
B/C PUSHBUTTON
When pressed, selects the
approach mode guidance
for capture and tracking of
back course ILS data.
STBY PUSHBUTTON
When pressed, clears all
flight director modes.
CAT 2 PUSHBUTTON
When pressed, activates the
category 2 approach logic for
annunciation of CAT 2 STATUS.
provided that the approach (APP)
mode is armed and radio altitude is
greater than 800 feet.
GLARESHiELD
Flight Director Function Related Controls -
Flight Guidance Controller
Figure 2 (Sheet 1)
SECTION 4
Page 6
Apr 02/87
cftai/enoer
OPERATING MANUAL
PSP 601A-6
HDG PUSHBUTTON
When pressed, activates the lateral
guidance to compute bank
commands based on the selected
heading displayed on the coupied
SHSI.
ALT PUSHBUTTON
When pressed, selects vertical
guidance to hold attitude.
I) I:
|l 'I
I I STBY
APP PUSHBUTTON
When pressed, arms the lateral
guidance for localizer capture.
Immediately following localizer
capture, the vertical guidance is
armed for gfcoeslope capture.
VS PUSHBUTTON
When pressed, selects vertical
guidance to hold vertical speed.
When pressed, selects the flight
Jevei change mode and overrides all
active vertical modes, except VNAV
VNAV PUSHBUTTON
When pressed, selects the vertical
navigation mode, tracking the
vertical flight profile from the
selected FMS.
GLARESHIELD
Flight Director Function Related Controls -
Flight Guidance Controller
Figure 2 (Sheet 2)
SECTION 4
Page 7
Apr 02/87
OPERATING MANUAL
PSP 601A-6
CPL POINTERS
Indicate whether the pilot's EHSl and OAOC is
coupled to the master FGC (left pointer) or the
copilot's EHSl and DADC is coupled to the master
FGC {right pointer). During an ILS approach, the
AFCS automatically selects the data from both
sides {both pointers come on). If on side fails, the
remaining good side is selected.
CPL PUSHBUTTON
When pressed, selects either the pilot's or copilot's
EHSl and DADC data for lateral and vertical flight
guidance to the FGC 1 and FGC 2. During transfer,
all flight director modes are cancelled. At power
up, the pilot's data is selected. Pressing the CPL
pushbutton selects the copilot's data. Pressing it a
second time reseieet the pilot's data.
GLARESHIELD
Flight Director Function Related Controls -
Flight Guidance Controller
Figure 2 (Sheet 3)
SECTION 4
Page 8
Apr 02/87
canaaair
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OPERATING MANUAL
PSP 601A-6
HOG PUSH SYNC PUSHBUTTON
When rotated, moves the heading
bug on the pilot's EHSI. When
pressed, causes the heading bug to
synchronize to the aircraft heading.
IAS/MACH PUSH CHG CONTROL/
SWITCH
When rotated, adjusts the
JAS/Mach reference on the pilot's
and copilot's EADls. When pressed.
change the IAS reference to Macti
reference or vice versa. The push-change
function is inhibited wtth the
aircraft on the ground.
CRS PUSH OCT CONTROL/
SWITCH
When rotated, moves the course
select pointer on the associated
EHSI. When pressed, causes the
^course pointer to indicate the zero
deviation course to the tuned VOR
station. When an FMS source is
selected, rotating the control causes
the preselect course pointer to
move.
ALT S£L CONTROL
When rotated, adjusts the
ASEL display on the piJot's
and copilot's EAOIs.
HDG PUSH SYNC PUSHBUTTON
When rotated, moves the heading
bug on the copilot's EHSI. When
pressed, causes the heading bug to
synchronize to the aircraft heading.
GLARESHIELD
Flight Director Function Related Controls -
Instrument Remote Controllers
Figure 3
SECTION 4
Page 9
Apr 02/87
OPERATING MANUAL
PSP 601A-6
FLIGHT DIRECTOR COUPLE
ARROW
indicates whether the pilot's side or
copilot's side is coupled to the
AFCS. The couple arrow is Displayed
in green when on-side the FGC is
master and yellow when the crossside
FGC is master.
FLIGHT DIRECTOR MODE
ANNUNCIATIONS
indicate the selected flight director
models) and the status of the mode.
Armed modes are displayed in green
and captured modes are displayed in
white.
AicL D SI LA .
O f?*->? *.?? s ' - ^ i i ' : .;? : . _ ?: ' - . . .-.
flight director ASEL mode. Range is
from 0 to

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