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The total rapid realignment sequence takes approximately 32 seconds. Present position must
be reentered.
NOTE
If excessive motion is detected during rapid realignment, the system
restarts rapid realignment and resets the time remaining to align to
30 seconds.
IRS Attitude (ATT) Mode
Attitude mode is normally used when an IRS malfunction occurs. It may also be used if all power
to the IRS (including battery backup power) is lost then restored during flight. In attitude mode,
the IRS provides only pitch, roll, and heading outputs.
NAVIGATION SYSTEMS
Description
Vol. 2 17−10−7
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
INERTIAL REFERENCE SYSTEM (IRS) (CONT'D)
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. The
IRS ALIGNING DO NOT TAXI message appears on the PFD on ground, or IRS ALIGNING
message appears in flight.
If excessive motion is detected, the attitude alignment is run for an additional 20 seconds. Once
attitude alignment is complete, a free DG heading operation is available. Heading is entered
from the FMS CDU IRS CONTROL page via the SET IRS HDG prompt. Heading entries are
periodically required while the IRS is in attitude mode, to correct for heading drift.
Attitude Mode
Figure 17−10−5
IRS Shutdown
The recommended method of shutting down the IRS is by setting the MSU selector switch to
OFF. During this shutdown process, the IRU will remain powered for an additional 10 seconds
to allow system record storage (aircraft power should not be removed until 15 seconds after the
MSU is selected OFF).
To ensure proper system record storage, it is also recommended to keep the IRS in NAV mode
for a minimum of three minutes after the aircraft is parked.
Record storage at shutdown consists of the elapsed time indicator (ETI) record update, and
NAV updates, which are required to ensure the best possible alignments and NAV performance.
If power is removed from the IRU during the 10-second shutdown, the NAV updates and ETI
may not be stored.
Operating Tips
The IRS manufacturer recommends the following operating tips:
NAVIGATION SYSTEMS
Description
Vol. 2 17−10−8
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
INERTIAL REFERENCE SYSTEM (IRS) (CONT'D)
IRS Operating Tips
PHASE OF FLIGHT RECOMMENDATIONS
Alignment
For best performance the IRS should be aligned at random headings.
Continuous alignments at or near one cardinal heading may degrade
performance.
Initial position entry
Initial latitude and longitude should be entered within two minutes of
start-up. The initial latitude and longitude position should be within 1
nautical mile of actual aircraft position to ensure the most accurate IRS
alignment.
Prior to taxi
It is recommended to remain in NAV mode prior to taxi for at least five
minutes. The IRS continues to adjust for bias errors and temperature
changes as long as the aircraft is stationary.
Taxi
If practical, it is recommended that the aircraft stops during taxi for a
period of one to three minutes with a heading 90 to 180 degrees different
than the alignment heading. NAV updates are performed during taxi but
will not be used unless the aircraft has stopped for a minimum of one
minute.
Intermediate stops
During intermediate stops, it is recommended to use the rapid realign
feature when the IRS remains on during the stop. This will minimize drift
errors during subsequent flights as drift error is zeroed.
Post-flight
Keep the IRS on for a minimum of three minutes after the aircraft is
parked. After the IRS is turned off with the mode select switch, keep the
power applied for a minimum of 15 seconds to allow storing of the Nav
update records in the IRS memory.
Controls and Indicators
IRS Mode Select Unit (MSU)
Figure 17−10−6
NAVIGATION SYSTEMS
Description
Vol. 2 17−10−9
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
INERTIAL REFERENCE SYSTEM (IRS) (CONT'D)
IRS Reversionary Mode Selectors (Dual IRS Configuration)
Figure 17−10−7
PFD IRS Source Annunciations (Dual IRS Configuration)
Figure 17−10−8
IRS Reversionary Mode Selectors (Triple IRS Configuration)
Figure 17−10−9
NAVIGATION SYSTEMS
Description
Vol. 2 17−10−10
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
　
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