15-17
190-01004-03 Rev. P
GTN 625/635/650 Pilot’s Guide
System
If a lower CDI scale setting is selected (i.e., 1.0 or 0.3 NM), the higher scale
settings are not selected during ANY phase of flight. For example, if 1.0 NM is
selected, the GTN unit uses this for en route and terminal phases and ramps down
further during an approach. Note that the Horizontal Alarm (HAL) protection
limits listed below follow the selected CDI scale, unless corresponding flight
phases call for lower HAL. For example, if the 1.0 NM CDI setting is selected, full-
scale deflection during approach will still follow the approach CDI scale settings.
CDI Scale
Horizontal Alarm Limit
Auto (oceanic)
2.0 NM
±2.0 NM or Auto (en route)
2.0 NM
±1.0 NM or Auto (terminal)
1.0 NM
±0.3 NM or Auto (approach)
0.3 NM
Table 15-4 CDI Scale and Horizontal Alarm Limits
An “auto” ILS CDI selection allows the GTN unit to automatically switch the
external CDI from the GPS receiver to the VLOC receiver, when intercepting
the final approach course. Or, select “manual” to manually switch the external
CDI connection, as needed (using the
CDI
key). If the unit is installed with a
KAP140/KFC225 autopilot, automatic switching will not take place.
1. While viewing the System Setup page, touch the
CDI
key
.
Touch to Choose Auto or
Manual CDI Scale Selection
Touch to Select ILS
CDI Capture Type
Figure 15-21 CDI Selection
2. Touch the
CDI Scale
key
to toggle between automatic selection
or to choose the CDI scale manually.
Touch to Select
CDI Scale
Figure 15-22 CDI Scale Selection
Summary of Contents for GTN 625
Page 608: ...This page intentionally left blank ...
Page 609: ......
Page 610: ...190 01004 03 Rev P ...
