BOMBARDIER Challenger 601-3A CL-600-2B16 Pilot Training Manual page 434

Inertial Reference Unit
The main component for each IRS consists of
an IRU. The IRU contains a laser-gyro iner-
tial sensor that senses aircraft movements and
attitudes. The IRU uses this information to
calculate present position, primary attitude,
heading, velocities, and accelerations.
Depressing the IRS REV switchlights on the
pilot or copilot instrument panel selects the
ALIGN ANNUNCIATOR
LIGHT ILLUMINATES WHEN THE MODE SELECT
SWITCH IS IN THE ALIGN POSITION (MODE). THE
LIGHT FLASHES IF ALIGNMENT REQUIREMENTS
ARE NOT MET BECAUSE OF AIRCRAFT MOVEMENT
OR INCORRECT OPERATOR ACTION.
Honeywell
ALIGN
OFF
MODE SELECT SWITCH
SELECTS THE FOUR BASIC MODES AND THE
FOUR SUBMODES. NAV POSITION IS DETENTED.
• OFF—TURNS OFF THE IRS.
• ALIGN—TURNS THE IRS ON AND SELECTS THE
ALIGN MODE. TO COMPLETE THE ALIGN MODE,
THE INITIAL POSITION LATITUDE AND LONGITUDE
MUST BE ENTERED INTO THE IRS, EITHER FROM
THE FMS OR FROM THE ISDU.
• NAV— SELECTS THE NAVIGATION MODE IF THE
ALIGN MODE IS SUCCESSFULLY COMPLETED.
• ATT—SELECTS THE REVERSIONARY ATT (ATTITUDE)
MODE FOR THE IRS, NORMALLY USED WHEN THE
NAV MODE FAILS.
Figure 16-21. Mode Select Unit Align and Nav Mode
16-22 CL 601-3A/R
LASEREF
NAV
ATT
NAV RDY
CENTER PEDESTAL
FOR TRAINING PURPOSES ONLY
FlightSafety Canada
CL-600-2B16 PILOT TRAINING MANUAL
opposite side IRU for EFIS attitude and head-
ing source information. Selection of the
opposite IRU provides a backup if the onside
IRU fails.
Backup Battery/Charger
Located in the rear equipment bay, the IRS
backup battery/chargers provide 28 VDC
backup power for each IRS if a primary
115 VAC power loss occurs. The IRS MSU and
NAV RDY ANNUNCIATOR
COMES ON TO INDICATE THAT
THE ALIGNMENT IS COMPLETE.
ALIGN
L t é e
L t d .
TEST