PRIMUSr 1000 Integrated Avionics System
A28--1146--112--00
Modes of Operation
8-24
1500
2020
3030
3030
AD--50993--R1@
ILS Approach Mode Tracking PFD
Figure 8--19
GainprogrammingisperformedontheGSsignaltocompensateforthe
aircraft closing on the GS antenna and beam convergence caused by
the directional properties of the antenna, as shown in figure 8--20. GS
programming is normally a computed function of radio altitude (if
available).
Ifradioaltitudeisnotavailable,thenGSgain programming is afunction
of vertical speed (VS), true air speed (TAS), and time.
The approach mode is cancelled by any one of the following actions:
D Pushing the APR or NAV buttons on the GC
D Loss of ILS GS data
D Selecting go--around
D Selecting HDG on the mode selector
D Changing navigation or heading sources.
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