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update the IRS position, however, it is possible to perform a rapid realignment while on the
ground.
Attitude mode is a reversionary mode, used when the IRU has detected an inertial failure or
inaccuracies of the navigation operation in flight. Attitude mode does not provide position
data. In attitude mode, the heading may drift and must be corrected using the flight
management system (FMS). If the FMS is not available, the EICAS control panel can be
used to make heading corrections. Attitude mode is annunciated on the EICAS status page.
Vol. 1 12--50--3
REV 56, Jan 31/03
FLIGHT INSTRUMENTS
Attitude and Heading Reference System
Flight Crew Operating Manual
CSP A--013
MASTER
Attitude and Heading Reference System/Inertial Reference System <MST>
Figure 12---50---1
COMPENSATOR (COMP)
PITCH/ROLL/HEADING ANGLES
PITCH/ROLL/YAW RATES
LONG./LAT./NORMAL/CROSS
HEADING ACCELERATIONS
ALONG HEADING/VERTICAL
ACCELERATIONS
ERROR COMPENSATION AND
FLUX DETECTOR MISALIGNMENT
HEAD--UP
GUIDANCE
SYSTEM
<0026>
PFD 1 MFD 1 MFD 2 PFD 2
<0025>
1 IR S
OFF NAV
2
ATT OFF NAV ATT
INERTIAL
REFERENCE
SYSTEM
1
ATTITUDE
HEADING
COMPUTER
1
DCU 1, 2 & 3
INERTIAL
REFERENCE
SYSTEM
2
ATTITUDE
HEADING
COMPUTER
2
<PRE0025>
<PRE0025>
<PRE0025>
<0025> <0025>
<PRE0025>
<PRE0025>
<0025> <PRE0025>
<0025>
<0025>
<PRE0025>
<0019>
DCU 1 & 2
REV 56, Jan 31/03
Vol. 1 12--50--4
FLIGHT INSTRUMENTS
Attitude and Heading Reference System
Flight Crew Operating Manual MASTER
CSP A--013
Compass Control Panel/Inertial Reference System Mode Select Unit <MST>
Figure 12---50---2
1 -- IRS -- 2
Used to select IRS mode.
OFF -- Removes power
from IRS.
NAV -- IRS operates in
navigation mode.
ATT -- IRS operates in
attitude mode.
Pilot’s and Copilot’s Compass Control Panel
Center Pedestal
IRS Mode Select Unit
Center Pedestal
1 IRS 2
OFF NAV ATT OFF NAV ATT
MAG SLEW
+
DG
--
COMPASS
DG / MAG
Used to set AHRS mode
DG -- HSI performs like a
directional gyro and does
not use data from the
flux detectors.
MAG -- HSI is continuously
adjusted using data from
the flux detectors.
SLEW
Used to periodically correct heading
when in DG mode. Will move reading
in MAG mode, but returns to previous
heading when switch is released.
-- Slews HSI graphic reading to the right.
-- Slews HSI graphic reading to the left.
<0025>
Vol. 1 12--50--5
REV 56, Jan 31/03
FLIGHT INSTRUMENTS
Attitude and Heading Reference System
Flight Crew Operating Manual
CSP A--013
MASTER
Attitude Director Indications <MST>
Figure 12---50---3
Roll Pointer (white)
Indicates roll angle
Pointer rotates along
fixed roll scale.
Slip / Skid Indicator (white)
Indicates lateral acceleration.
Moves with roll pointer.
Lateral displacement from
center of roll pointer indicates
airplane is slipping or skidding.
Airplane Symbol (black)
Indicates position of airplane
in relation to horizon index.
Horizon Line (white)
Indicates roll and pitch attitude
relative to airplane symbol.
Horizon bar rotates to display roll
attitude and moves vertically to
display pitch attitude.
The boxes at ends of horizon bar
represent airplane wing tips.
Attitude Director Indicator
Attitude Director
Indicator
Roll Scale (white)
Fixed scale that indicates
roll attitude.
Small marks at 10 and 20
Large marks at 30 and 60
Small triangle at 45
Primary Flight Display
Pilot’s and Copilot’s Instrument Panels
10
10
<0015>
REV 56, Jan 31/03
Vol. 1 12--50--6
FLIGHT INSTRUMENTS
Attitude and Heading Reference System
Flight Crew Operating Manual MASTER
CSP A--013
Selected Heading Readout <MST>
Figure 12---50---4
Selected Heading Readout (magenta)
Indicates selected heading as set using
heading knob on flight control panel.
Removed 5 seconds after heading is
selected.
Horizontal Situation Indicator
Selected Heading Bug (magenta)
Indicates selected heading as set
using heading knob on flight control
　
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