Honeywell EGPWS MK V Pilot's Manual page 28

Terrain
Clearance
Floor
Continued
28
In -210-210 and later versions, the TCF alert envelope
and Envelope Bias Factor are improved. The alert
envelope is limited to a minimum of 245 feet AGL
adjacent to the runway as illustrated in the following
diagrams. The Envelope Bias Factor is reduced (moved
closer to the runway) when higher accuracy aircraft
position and runway position information is available.
This is typically 1/3 to 1 nm providing greater protection
against landing short events.
Improved TCF Envelope Plan View
Also in -210-210 and later versions, runway selection
logic is improved to better identify the destination
runway. Comprehensive aircraft position and navigation
information is used to evaluate proximity runways and
determine the most likely destination runway for all
alerting purposes.
Improved TCF Envelope
060-4241-000 • Rev. D - March 2000
MK V & MK VII EGPWS Pilot Guide