Honeywell SPZ-8000 - VOR over Station Operation; VOR Approach (VAPP) Mode; VOR over Station Zone of Confusion

SPZ--8000 Digital Integrated Flight Control System
A28--1146--055
REV 2
8-11
Modes of Operation
VOR Over Station Op eration
As the aircraft approaches the VOR station, it enters a zone of unstable
radio signal, as shown in Figure 8--9. This zone of confusion radiates
upward from the station in the shape of a truncated cone. In this area,
the radio signal becomes erratic and it must be removed from the roll
command. The over station sensor monitors for when the aircraft enters
the zone of confusion, and it removes the radio deviation from the roll
command.
When over the VOR station, the system can accept and follow a course
change of up to 120.
VOR Over Station Zone of Confusion
Figure 8--9
VOR Approach (VAPP) Mode
The VOR approach mode is set up identically to the VOR mode. The
difference is that with flaps set to any position other than zero, the flight
guidance controller sets bank limits and rate limits to ensure proper gain
control and performance from VOR capture, through the approach, and
on to the landing.