Honeywell EGPWS MK V Pilot's Manual page 15

Mark V and Mark VII EGPWS Pilot's Guide
MODE 1 If a valid ILS Glideslope front course is received and the
aircraft is above the glideslope centerline, the outer (sinkrate)
Continued
boundary is adjusted to desensitize the sinkrate alerting. This
is to prevent unwanted alerts when the aircraft is safely
Glideslope
capturing the glideslope (or repositioning to the centerline)
Deviation
from above the beam.
Bias
If the Aural Declutter feature is disabled, the Sinkrate alert
boundary remains fixed and the aural message "SINKRATE"
repeats continuously until the outer boundary is exited.
Envelope Through Envelope Modulation, both boundaries can be biased
to the right at certain airports to minimize nuisance alerts or
Modulation
warnings.
Steep The EGPWS offers a Steep Approach option for given aircraft
types that desensitizes the alert boundaries to permit steeper
Approach
than normal approaches without unwanted alerts. If Steep
Bias
Approach is selected (active) then the cockpit self-test is
inhibited if the aircraft is on the ground.
For Airbus A318/319/320/321 with version -226-226/-003 or
later, when Steep Approach is active Mode 1 is disabled
below 130 ft and no other Mode 1 bias functions are allowed
to operate (Envelope Modulation or above the beam
Glideslope bias).
MODE 2 Mode 2 provides alerts to help protect the aircraft from
impacting the ground when rapidly rising terrain with respect
Excessive
to the aircraft is detected. Mode 2 is based on Radio Altitude
Closure to
and on how rapidly Radio Altitude is decreasing (closure
Terrain
rate). Mode 2 exists in two forms, 2A and 2B.
060-4241-000
Rev H, August 2011
System Description
9