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PRED (Predictive Altitude) Display
The Predictive Altitude Display Area is a circular conic up to 13 nm in
radius within which the future altitude of the aircraft (based on current
conditions) is compared to the terrain heights and then color coded. In
FULL display mode, the terrain behind the aircraft will be shown as if the
airplane were to have turned in that direction at the current climb or
descent profile.
The 13nm limit is shown by a solid cyan circle. No terrain at all will show
beyond this 13nm limit in PRED display mode.
PRED is useful when used in climbs and descents by visually presenting
the terrain situation farther into the future than FLTA alert itself. This
provides the pilot a means to avoid alerts before they occur. In a climb,
PRED will clearly show the terrain the aircraft is out-climbing in its
current configuration. This feature can give useful information during an
engine-failure scenario in a terrain-rich environment. The pilot should be
aware that PRED shows this information in regard to the current climb
rate. Therefore if the aircraft climb rate is degrading the display will show
a more optimistic view than it will show once the steady-state climb rate is
finally achieved.
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In PRED mode a red cell will always produce an FLTA alert when close
enough to and on the aircraft’s flight path. A yellow cell
may
produce an
alert if it meets the alerting criteria; the alerting criteria are lower than the
color coding criteria by a few hundred feet. For this reason not every cell
colored “yellow” will produce an alert. A green or black cell will never
cause an alert.
