060-4241-000 • Rev. D - March 2000
MK V & MK VII EGPWS Pilot Guide
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 over-ride
selected) or when making an ILS approach with Glideslope
and Localizer deviation less than 2 dots. It is also active during
the first 60 seconds after takeoff.
With version -210-210 and later models, Mode 2B is selected
when the aircraft is within 5nm and 3500 feet of the
destination airport (independent of configuration) and the
Terrain Alerting and Display (TAD) 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 2B envelope is
selected in order to reduce the potential for nuisance alerts
during an approach.
The graph above shows the Mode 2B envelope.