PRIMUSr 1000 Integrated Avionics System
A28--1146--112--00
8-19
Modes of Operation
When the back coursemode is selected bypushing the NAV buttonon
the mode selector with ILS displayed onEFIS,andtheselectedcourse
being more than 105_ off the aircraft heading, logic in the IAC’s flight
control function establishes internalreversepolarityof the course error
and localizer signals. A gain change takes place in the computerwhen
BC is selected because the aircraft is closer tothe localizer antennaby
the length of the runway plus 1000 feet.
At back course capture, the IAC flight control function generates a roll
command to capture and track the back course localizer signal, as
shown in figure 8--16.
The BC mode is cancelled by any one of the following:
D Pushing NAV on the GC
D Selecting the heading or go--around modes
D Changing the displayed navigation or heading source.
3030
3030
3
2
1
0
1
2
3
AD--50987--R1@
AP
Back Course Tracking Display
Figure 8--16
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