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Pilot’s Side
Normally fed as follows:
Copilot’s Side
Normally fed as follows:
PFD Annunciation
Pilots Selected
ADC
Copilots Selected
ADC
PFD1 Source
Annunciation
PFD2 Source
Annunciation
ADC1 ADC1 ADC1 ADC1
ADC1 ADC2
ADC2 ADC1 ADC2 ADC1
ADC2 ADC2 ADC2 ADC2
ADC1 ADC3 ADC3
ADC2 ADC3 ADC2 ADC3
ADC3 ADC3 ADC3 ADC3
ADC3 ADC1 ADC3 ADC1
ADC3 ADC2 ADC3
ADC Source Annunciation
GF1110_007
ADC 1 − if reverted then,
ADC 3 − if reverted then,
ADC 2.
ADC 2 − if reverted then,
ADC 3 − if reverted then,
ADC 1.
HDG AP2 FLC 100 00
VOR ADC2
NORM
ALTN
PFD1
NORM
ALTN1
EICAS
NORM
ALTN
PFD2
ALTN2
ALTN3
PFD1 PFD2
NORM
ALTN
SG1
NORM
ALTN
SG3
NORM
ALTN
SG2
IRS ADC ADC IRS
FLIGHT INSTRUMENTS
REV 46, Jul 21, 2005 Flight Crew Operating Manual
CSP 700−6
Volume 2
11−10−7
INERTIAL REFERENCE SYSTEM
The Inertial Reference System (IRS) provides attitude, directional, position and 3axis
rate/accelerometer data to the following airplane systems:
· PFDs and MFDs
· Weather radar system
· AFCS
· EGPWS
· TCAS
· Stall protection system
· Fuel system
· Flight data recorder
· Air data computer
· FMS
Each IRS computer (IRS 1, IRS 2, IRS 3) receives true airspeed and altitude from the applicable
(onside,
either left or right side) air data system. In the event of a failure of the onside
air data input,
the offside
input is automatically selected.
The IRS mode select panel, located on the pedestal, is used to initialize the IRS and to select NAV or
ATT modes.
IRS Mode Switches
OFF
NAV
ATT
attitude information, in the event of
NAV mode failure.
IRS Mode selector Panel
G08F1110_008
ALN
(time to align will differ with temperature
and latitude).
after ALN completed.
− Removes power from IRS.
− Normal operating mode, selected
− Reversionary mode, used to provide
− Aligns IRS in approximately 7 minutes
IRS1 IRS2 IRS3
NOTE
During IRS initialization the PFD is in a failure mode.
HDG
IN
CRS
0
1
2
3
1
2
3
BARO
NM
HDG
FAIL
VS
TCAS FAIL
GF1110_009
RAD
ATT
FAIL
FLIGHT INSTRUMENTS
Flight Crew Operating Manual REV 46, Jul 21, 2005
CSP 700−6
Volume 2
11−10−8
INERTIAL REFERENCE SYSTEM (CONT'D)
At an IRS internal temperature between −54°C and −40°C, the power supply will turn on, but normal
alignment will not start until IRS temperature is >−40°C. The IRS will not go to NAV mode until the
internal temperature of IRS reaches −15°C
LOW TEMPERATURE ALIGNMENT
IRS Internal Temperature (° C) Time to Complete Alignment (min.)
<−12.5 16
−12.5 to −10.0 15
−10.0 to −7.5 14
−7.5 to −5.0 13
−5.0 to −2.5 12
−2.5 to 0 11
> 0 7
Inertial reference accuracies are achieved for alignments between ± 78° of latitude. The IRS requires
that the initial position be entered from either flight management system (FMS) control display unit
(CDU) via the POS INIT page.
NOTE
Aircraft must be stationary during the alignment. If the aircraft is moved,
the mode select switch must be set to OFF for a minimum of three
seconds before the align mode can be reestablished.
Align downmode is possible, once the IRS is in navigation mode, by selecting the NAV/ATT switch
from NAV to ALN for a minimum of three seconds until ATT FAIL appears and back to NAV. Velocity
errors are corrected and tilt errors are removed to correct the pitch and roll angles. The total rapid
realignment
time is 30 seconds. Present position may be reentered.
FLIGHT INSTRUMENTS
REV 46, Jul 21, 2005 Flight Crew Operating Manual
CSP 700−6
Volume 2
11−10−9
INERTIAL REFERENCE SYSTEM (CONT'D)
The reversion control panel, located on the pedestal, is used for pilot reversion of the IRS and PFD.
IRS 3 − if reverted then,
IRS 2.
GF1110_011
IRS 3 − if reverted then,
IRS 1.
IRS 2 − if reverted then,
IRS 1 − if reverted then,
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