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ATT ATT ATT
GX_16_019
IRS Mode Switches
OFF
ALN
NAV
ATT
NOTE
– Removes power from IRS.
Power down mode, IRS will turn off
in approximately 10 seconds.
Aligns IRS in approximately
7 minutes (time to align will differ
with temperature and latitude)
Normal operating mode,
selected after ALN completed
Reversionary mode, used
to provide attitude information,
in the event of NAV mode failure
: During IRS initialization
the PFD is in a failure mode.
–
–
–
HDG
FAIL
ATT
FAIL
For Training Purposes Only
Sept 04
16-19
P I LOT T R A I N I N G GU I D E
NAVIGATION
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 is optional to be reentered.
The reversion control panel, located on the pedestal, is used for pilot reversion of the
IRS.
IRS ADC ADC IRS
SG 3
EICAS
SG 1 SG 2
PFD 1
ALTN 3
ALTN
ALTN 1
ALTN ALTN
ALTN
NORM
NORM
NORM NORM
NORM
PFD 1 PFD 2
PFD 2
ALTN 2 ALTN
NORM
GX_16_020
IRS Switches
Used to select
reversion on
appropriate IRS
Pilot's Side
Normally fed as follows:
• IRS 1 if reverted then
• IRS 3 if reverted then
• IRS 2
–
–
Copilot's Side
Normally fed as follows:
• IRS 2 if reverted then
• IRS 3 if reverted then
• IRS 1
–
–
P I LOT T R A I N I N G GU I D E
NAVIGATION
16-20 For Training Purposes Only
Sept 04
The reversionary attitude mode, which provides attitude, heading, rate and
acceleration data, but not position data, may be selected when navigation mode is not
available. This condition may occur in the air, following a power interrupt or transient
system fault. Attitude alignment takes 1 minute from power off to ATT mode or 34
seconds from NAV to ATT mode, provided the airplane is stationary on the ground or
in straight and level flight. If excessive motion is detected, the attitude alignment is
run for an additional 20 seconds. Once attitude alignment is complete, heading is
entered from the FMS. Heading entries may be made, while the IRS is in the attitude
mode, to correct for heading drift.
CAUTION
During flight, navigation reference is lost if the MSU mode
select switch is set away from NAV.
NOTE
IRS will not restart or realign on airplane battery bus power. If
airplane primary power is lost, IRS can continue to operate on
airplane direct battery bus power.
SYSTEM SELECT FAULT
ON
FROM TO WPT
WPT
LEG
CHG
XTK
DTK
WD
WS
DIS
TIM
HDG
STS
POS
TK
GS
1
M
2 T
BRT
3 DIM
TST
ENT
BCK
0 CLR
7 S
8
9
W
4
5
E
6
1
N
2
3
88888
8 8
8 8888888
GX_16_021
IRU 3 IRU 2
WX
SPC
GPWS
DAU 1
DAU 2
IRU 1
SPC
SPC
GPWS
ASCB
IRS MODE SELECTOR PANEL
LASERTRACK
(IF INSTALLED)
NDU
IRS 1 IRS 3 IRS 2
NAV NAV NAV
ALN ALN ALN
OFF OFF OFF
ATT ATT ATT
For Training Purposes Only
Sept 04
16-21
P I LOT T R A I N I N G GU I D E
NAVIGATION
LASEREF IV DIFFERENCES
The differences between Global aircraft installed with the LASEREF IV and the
aircraft installed with LASEREF III are as follows:
• 9 pounds lighter
• Mean Time Between Failures (MTBF) 17,000 flight hours versus 7000 for
LASEREF III
• Consumes less power
• Auto NAV Realign function anytime the aircraft is not moving. Zeroes out velocity
errors
• Updated MAG MAPS
P I LOT T R A I N I N G GU I D E
NAVIGATION
16-22 For Training Purposes Only
　
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