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be used by other avionics systems.
The IRS is a dual system with two inertial reference units (IRU) and a dual mode select unit
(MSU). Each IRU receives information from the same side air data system. The IRU
measures inertial motion sensed by the inertial instruments and computes attitude and
heading data. This information is processed and sent to the integrated avionics processor
system which interfaces with the flight control computers and flight management computers.
These signals are also routed to the TCAS, EGPWS, fuel system, stall protection system,
flight data recorder and data concentrator units. The MSU provides pilot selection of the IRS
modes.
The IRS provides attitude and heading information to the electronic flight instruments.
Attitude is displayed on the attitude direction indicator (ADI) of the primary flight displays and
heading is displayed on the horizontal situation indicator (HSI) portions of the displays.
Heading is selected to magnetic or true using the flight management system (refer to
Chapter 18).
The IRS normally operates in navigation mode. In navigation mode, it is not possible to
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--2
FLIGHT INSTRUMENTS
Attitude and Heading Reference System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Inertial Reference System Interface <1015,1025>
Figure 12---50---1
IRU 2
EICAS
IAPS
SPC
ADC 1
ADC 2
FSCU
PSEU
GPWS
TCAS
(FDR) ATT
ATT/HDG
LAT ACC
ALIGN
ACC/ATT
TAS/ALT
ATT/ACC
PFD 1
MFD 1
PRIMARY
POWER
BATTERY
BACKUP
FMC 1, FMC 2
(FCC 1/2, WXR
MDC)
M1 M2
IRU 1
ATT
ATT/HDG
LAT ACC
TAS/ALT
ALIGN
HDG
PFD 2
MFD 2
PRIMARY
POWER
BATTERY
BACKUP
MSU
M1 M2
Vol. 1 12--50--3
FLIGHT INSTRUMENTS
Attitude and Heading Reference System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Inertial Reference System Mode Select Control Panel <1025>
Figure 12---50---2
IRS Mode Select Unit
Center Pedestal
1 IRS 2
NAV
OFF ATT
NAV
OFF ATT
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.
Vol. 1 12--50--4
FLIGHT INSTRUMENTS
Attitude and Heading Reference System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Attitude Director Indicator <1015>
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.
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
Vol. 1 12--50--5
FLIGHT INSTRUMENTS
Attitude and Heading Reference System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Selected Heading Readout <1015>
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
panel. When bug is off scale, a
dashed line is displayed from center
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