IFD400 Series Pilot Guide
3-10 Map Subsystem
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.
If there is fuel remaining in excess of the reserve, the maximum
range of the aircraft is shown using a solid yellow ring beyond the
extent of the dashed green ring. When the total remaining fuel
quantity is less than the reserve, single ring is presented using an
alternating red/yellow dashed style.
The fuel range rings are always displayed and cannot be turned off,
though they can be hidden at low map ranges because of
decluttering. Changes in power settings, changes in winds aloft, and
remaining fuel quantity will alter the range depiction. Inaccurate
manual entry of initial fuel quantity will result in an inaccurate fuel
range ring depiction.
Fuel range rings with remaining reserves
Fuel range rings with less than reserve remaining
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