Honeywell SPZ-8000 Pilot's Manual page 180

The aircraft is flying the heading intercept and the system is armed for
automatic localizer beam capture, as shown in Figure 8--14.
With the aircraft approaching the selected course intercept, the lateral
beam sensor monitors localizer beam deviation, beam rate, and TAS.
At the computed time, the lateral beam sensor trips and captures the
localizer signal, as shown in Figure 8--15. The flight guidance computer
drops the heading select mode and generates the proper roll command
to bank the aircraft toward localizer beam center.
A28--1146--055
REV 2
SPZ--8000 Digital Integrated Flight Control System
Localizer (NAV) Mode Intercept
Figure 8--14
Localizer (NAV) Mode Capture
Figure 8--15
Modes of Operation
8-19