AIRPLANE
OPERATIONS
MANUAL
NAVIGATION AND
COMMUNICATION
REVISION 35
2-18-35
Page
4C
Code
02
On airplanes equipped with dual Inertial Reference System (IRS),
replacing the AHRS, the IRS is used as a primary navigation sensor
when other navaid are not available.
The dual FMS configuration may operate with dual IRS and dual GPS,
providing four long-range navigation sensors.
In this configuration, on-side FMS outputs and flight plan information
are available to the opposite-side FMS through an interconnecting bus.
The automatic tuning is made through the RMU for computing an
optimum position. The FMS also includes a radio-tuning page on which
the pilot can manually select VHF NAV, COM, ADF and transponder
frequencies.
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