Mark V and Mark VII EGPWS Pilot’s Guide
060-4241-000 System Description
Rev H, August 2011 27
Clearance
Floor
Continued
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. With version -218-218 and later
models, the envelope bi
as factor is reduced to 1/4 nm if
runway and position data is of high integrity.
Terrain
4 NM 12 NM 15 NM
400' AGL
700' AGL
Terrain
*245 foot curve expansion on runway
sides only applicable to -210-210 and on.
*
RUNWAY
ENVELOPE BIAS FACTOR
ENVELOPE BIAS FACTOR
45°
245 FT
245 FT
CONVENTIONAL TCF
CONVENTIONAL TCF
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 proximate runways and determine the most
likely destination runway for all alerting purposes.
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