Fuel Range Rings - BENDIXKing AeroNav 910 Pilot's Manual

AeroNav 900/880 Series Pilot's Guide
TIPS AND TECHNIQUES
Scenarios for Airspace Aural Alerting
A technique for the use of aural airspace alerting is to
turn it on via the Users Options page when flying in non-
familiar areas, especially when operating under VFR.
Experience has shown that local area flights in familiar
airspace or when operating under IFR can result in what
may be considered nuisance calls.

FUEL RANGE RINGS

When the AeroNav is interfaced with a functioning fuel flow system,
fuel range rings will be displayed on the map. The fuel range rings
depict the range of the aircraft given the current fuel quantity
remaining (from the totalizer) and current fuel flow. Current winds
are taken into account since the range calculation uses ground
speed. The range ring calculation is performed assuming a 45
minute fuel reserve for fixed wing aircraft and a 20 minute reserve for
helicopters.
A dashed green fuel range ring shows the maximum range of the
aircraft while still retaining the reserves. In other words, when the
aircraft reaches the dashed green line, only reserve fuel is left.
A solid fuel range ring shows the maximum range of the aircraft using
all of the current fuel on board. When there is fuel remaining in
excess of the reserve, the solid fuel range ring is colored yellow.
When the total remaining fuel quantity is less than the reserve, the
solid fuel range ring is colored red.
The fuel range rings are always displayed and cannot be turned off.
Changes in power settings, changes in winds aloft, and inaccurate
fuel totalizer data will alter the range depiction. Inaccurate manual
entry of initial fuel quantity will result in an inaccurate fuel range ring
depiction.
4-10 Map Subsystem
89000039-010
Rev 1 May 2019