AeroNav 900/880 Series Pilot’s Guide
89000039-010
6-28 Navigation Rev 1 May 2019
If the published back course approach is entered into the FMS,
the AeroNav nav source will automatically toggle from
“GPSVLOC” to “VLOC” when all transition criteria have been
met outside the FAF and it will automatically tune the localizer
frequency into the active nav channel. The Nav Mode datablock
should display the localizer ID, landing airfield ID and the front
course runway ID.
When integrated with an EFIS (e.g. BendixKing PFD, Aspen PFD,
etc), the front course may need to be manually entered and then
“Back Course” should be displayed on the EFIS.
WAAS APPROACHES
LPV (RNAV) approaches are the preferred approach for the
AeroNav, if available. On installation, a configuration setting
determines whether the AeroNav WAAS-capable. If non-WAAS,
the following procedures do not apply.
When GPS has been selected as the nav source, and one of the
RNAV/GPS approach types with vertical guidance (LPV, L/VNAV,
LNAV+V, LP+V) is selected in the FMS, the AeroNav will transmit
horizontal and vertical deviation for use by any integrated external
display device.
There are several types of WAAS approaches. The FMS will
automatically select the best available approach based on current
GPS integrity and will indicate the selection in the Nav Mode
datablock field.
TIPS AND TECHNIQUES
Nav Mode Datablock
The Nav Mode datablock (see page 5-30) will
indicate the current navigation mode (e.g. OCN,
ENRT, TERM, APPR, LPV, LNAV/VNAV, LNAV+V,
LNAV, etc). It is a default datablock and is an
excellent means to know GPS integrity and mode.
The pilot must monitor the AeroNav throughout the approach and
use charted minimums appropriate to the approach type. If an
approach type is not indicated by the time the final approach fix
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