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their on-side IRS. In a dual-IRS installation, selecting the reversionary selector to 1 or 2 results
in both the pilot’s and copilot’s displays receiving information from the selected IRU. In a
triple-IRS installation, selecting ALTN replaces the appropriate IRU data with IRU 3 data.
Single-source or cross-side IRS source annunciations are displayed on the affected PFDs (see
Figure 17−10−2).
Figure 17−10−3 shows the standard reversionary panel and optional reversionary panels
based on the indicated avionics configuration.
PFD IRS Source Annunciations
Figure 17−10−2
NAVIGATION SYSTEMS
Description
Vol. 2 17−10−4
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
INERTIAL REFERENCE SYSTEM (IRS) (CONT'D)
Source Selector Panel − IRS Reversionary Mode Selectors
Figure 17−10−3
IRS Normal Alignment
Normal alignment is achieved for IRS alignments between ±73° of latitude. When the mode
selector switches are in OFF, power is removed from the IRUs. When NAV is selected, power is
applied to the IRUs, and the IRUs automatically progress through a self-test mode, followed by
an alignment period before navigation (NAV) mode becomes available. The IRU will
automatically sequence to NAV mode 7 minutes after the MSU selector switch is turned to NAV,
if all of the following conditions are met:
• Aircraft is on the ground with no excessive motion detected
• The gyro temperature is above 0°C
• The latitude and position tests have passed
• Valid IRS initialization data has been received
NAVIGATION SYSTEMS
Description
Vol. 2 17−10−5
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
INERTIAL REFERENCE SYSTEM (IRS) (CONT'D)
IRS Initialization
In order to initialize the IRS, the present latitude and longitude coordinates must be entered
from either FMS CDU via the POS INIT page. The IRUs remain in the alignment mode, with
NAV selected on the MSU, if the present position is not entered. The initialization data can be
changed during the alignment, but both latitude and longitude coordinates must be entered.
During IRS initialization, the IRS ALIGNING DO NOT TAXI message appears on the primary
flight displays (PFDs). When alignment is complete, the PFD message goes out, and position
entry is no longer accepted. IRS alignment cannot be accomplished in flight.
NOTE
If possible, use of the GPS coordinates is recommended for
initialization, since they provide the most accurate aircraft position.
PFD IRS ALigning Annunciation
Figure 17−10−4
Low-Temperature Alignment
At an IRS internal temperature between −54°C and −40°C, the power supply will turn on, but
normal alignment will not start until the IRS temperature is greater than −40°C. The alignment
mode is inhibited when the gyro temperature exceeds +80°C.
The following table shows the time to complete alignment when the gyro temperature is below
0°C. IRU time to complete alignment is displayed on the FMS CDU POS INIT page 3/3.
NAVIGATION SYSTEMS
Description
Vol. 2 17−10−6
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
INERTIAL REFERENCE SYSTEM (IRS) (CONT'D)
Low-Temperature Alignment Times
IRU INTERNAL TEMP (°C) TIME TO COMPLETE ALIGNMENT (MIN.)
<−12.5 16 (see note)
−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
NOTE
Alignment time is extended beyond 16 minutes if the gyro
temperature has not reached at least −40°C. The system will not go
into NAV mode until the gyro temperature reaches −15°C.
Extended 15-Minute Alignment
The extended 15-minute alignment procedure allows the system to align at latitudes up to 80°
north and south.
After NAV has been selected, wait 15 minutes before entering the present position.
Refer to the CL-604 Airplane Flight Manual – Supplement 7, FMS Navigation in Polar Regions,
for additional navigation procedures when operating in polar regions.
IRS Rapid Realignment
When the IRS is operating in the NAV mode, it is possible to perform a rapid realignment
whenever the aircraft is on the ground. If the MSU selector switch is rotated from NAV to OFF
and back to NAV within 5 seconds, the system will sequence into the rapid realignment mode.
Velocity components are set to zero, a 30-second leveling mode corrects the pitch and roll
angles, and no gyro compassing is performed (the last heading from the NAV mode is used).
　
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