060-4241-000 • Rev. D - March 2000
MK V & MK VII EGPWS Pilot Guide
If overboost is required, adjust throttles back to maximum
rated thrust as soon as safety has been assured.
Overboosting engines while at high angle of attack near
airplane stall may cause engine stall, surge, or flameout.
Maintain escape attitude and thrust and delay retracting flaps
or landing gear until safe climb-out is assured.
Partial system deactivation or compensation can be
accomplished for abnormal procedures as follows:
If steep approaches are to be performed (4º or greater) EGPWS
STEEP APPROACH should be enabled and selected for these
operations. This may be accomplished automatically by
on-board systems or manually selected by a cockpit switch.
When active, Mode 1 alerts are desensitized to compensate for
normally higher descent rates for these types of operation,
eliminating related unwanted alerts. If implemented with a
cockpit switch, this requires manual deactivation.
When required to operate in close proximity to terrain (less
than 2500' above), Mode 2 alerts can be desensitize or
overridden by activating the FLAP OVER-RIDE switch to
eliminate related unwanted alerts. This requires manual
Mode 4 alerts can be reduced by activation of the FLAP
OVER-RIDE switch. This is generally recommended when
performing approaches with less than landing flaps selected.
This requires manual deactivation.
Mode 5 Glideslope alerts can be manually canceled when
below 2000 feet Radio Altitude (Standard G/S Cancel) by
pressing the G/S Cancel switch (commonly part of the amber
caution annunciators "BELOW G/S" or "GPWS"). This is
typically selected when an unreliable Glideslope is expected or
when maneuvering is required during ILS final approach. The
G/S Cancel is automatically reset following landing or if the
aircraft climbs above the 2000 feet.