AeroNav 900/880 Series Pilot’s Guide
89000039-010
Rev 1 May 2019 Map Subsystem 4-39
NOTE
Terrain Alert Warning Maneuver
When a terrain alert warning occurs, immediately initiate
and continue a climb that will provide maximum terrain
clearance, or any similar approved vertical terrain
escape maneuver, until all alerts cease. Only vertical
maneuvers are recommended, unless operating in
visual meteorological conditions (VMC) and/or the pilot
determines, based on all available information, that
turning in addition to the vertical escape maneuver is
the safest course of action.
NOTE
Do Not Use TAWS For Navigation
The TAWS terrain display is intended to serve as a
situational awareness tool only. It may not provide the
accuracy and/or fidelity on which to solely base
decisions and plan maneuvers to avoid terrain or
obstacles.
PREMATURE DESCENT ALERT (PDA)
The PDA function is available for all types of instrument approaches,
including those approaches that are not aligned within 30 degrees of
the runway heading as well as circling approaches and straight-in
approaches.
The PDA function uses the aircraft’s current position and flight path
information as determined from the FMS/GPS and nav database to
determine if the airplane is hazardously below the normal (typically 3
degree) approach path for the nearest runway.
PDA is inhibited when inside an FLTA exclusion area and only runs
between 1NM and 5NM from the nearest runway or ARP and
requires the nav mode to be in Approach mode.
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