13
060-4314-000 • Rev. C - May 2004
MK VI & MK VIII EGPWS Pilot Guide
MODE 2B
MODE 2A
Continued
The Mode 2A upper limit is reduced to 1250 feet (950 feet with
version -022 and later) for all airspeeds when the Terrain Alert
-
ing and Display function is enabled and available. This is due
to the enhanced alerting capability provided with TAD, resulting
from high integrity GPS Altitude and Geometric Altitude data. The
Mode 2A envelope is lowered in order to reduce the potential for
nuisance alerts during an approach.
Mode 2B provides a desensitized alerting envelope to permit
normal landing approach maneuvers close to terrain without
unwanted alerts. Mode 2B is automatically selected with flaps in
the landing configuration (landing flaps or flap Override selected)
or when making an ILS approach with Glideslope and Localizer
deviation less than 2 dots. It is also active during the first 60 sec
-
onds after takeoff.
Mode 2B is selected when the aircraft is within 5nm (10nm with
version -022 and later) and 3500 feet of the destination airport
(independent of configuration) and the Terrain Alerting and Dis
-
play (TAD) function is enabled and available. This is due to the
enhanced alerting capability provided with TAD, resulting from high
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