AeroNav 900/880 Series Pilot
’s Guide
89000039-010
6-26
Navigation
Rev 1 May 2019
TIPS AND TECHNIQUES
Exception to Automatic Nav Mode Switching
If VLOC mode had been previously manually
selected to be the nav mode (e.g. cross-tuning a
VOR) and then an approach is activated in the flight
plan that would have normally resulted in a
GPS
VLOC nav mode indication, the nav mode will
NOT toggle to GPS
VLOC. Instead, it will stay at
VLOC since it is assumed the pilot intended to keep
using the previous function. Likewise, the approach
nav frequency will be inserted into the #1 standby
nav frequency slot but not the active nav frequency
position. Both the nav mode transition and the
swapping of the nav frequencies will have to be
manually performed by the pilot.
With the proper inbound course set, including on localizer or ILS
approaches where the course pointer is just for reference, the
course and glide slope deviation data will be transmitted as
appropriate from the AeroNav for display on compatible cockpit
third-party devices such as CDIs, HSIs, EFISs, etc. In the
ILS/Localizer case, the CDI deflection will be driven by the
localizer signal itself, regardless of the course setting.
PRECISION APPROACHES
VHF Based Precision Approaches
†
On ILS/LOC approaches (Vectors-to-Final transition or the full
published procedure), the AeroNav will automatically toggle the
nav mode to VLOC when all of the following conditions have been
met for 5 consecutive seconds:
The next leg or the active leg terminates at the FAF
The aircraft is on the front side of the approach
The aircraft course is within 15 degrees of the final
approach course
Cross track deviation is less than half a dot
The correct station is tuned and identified
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