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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
deactivation.
Mode 4 alerts can be reduced by activation of the FLAP
OVER-RIDE switch, or GEAR OVER-RIDE. This is generally
recommended when performing approaches with less than
landing flaps selected, or landing gear not down. This requires
manual deactivation.
Mode 5 Glideslope alerts can be manually canceled when
below 2000 feet Radio Altitude (or 1000 feet dependant on
aircraft type) 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 or
1000 feet dependant on aircraft type.
Windshear
Warning
continued
060-4241-000 • Rev. E - December 2003
54 MK V & MK VII EGPWS Pilot Guide
Terrain
Alerting and
Clearance
Floor
In some cases, an Alternate G/S Cancel is available. This allows
the Mode 5 alerting to be canceled at any time and any
altitude. In this configuration, which is defined only for certain
aircraft types or by program pin, pressing the G/S Cancel
switch in the cockpit has the effect of inhibiting Mode 5 alerting.
It can be manually reset by again pressing the G/S Cancel
switch, or it is automatically reset following landing, if flap or
gear state changes (i.e., down to up), or when the aircraft
climbs above a predetermined altitude (defined for the aircraft
type). Because of the nature of this type of G/S Cancel, a cockpit
indication of its activation is required.
Some aircraft may be configured with a G/S inhibit switch.
This switch is separate from the one discussed above but also
results in inhibiting Mode 5 alerting. This switch is intended
for selection during back course approaches to eliminate
unwanted alerts that may result. If a discrete back course
signal is available from another system, this input to the
EGPWC may be connected to that system for automatic
Mode 5 inhibiting.
NOTE: Implementation of the Glideslope Cancel and/or
Inhibit inputs to the EGPWS varies. Verify a particular
application to determine the implementation used.
Pressing the Terrain Inhibit switch inhibits TAD and TCF
alerting and display, including Obstacles and Peaks when
enabled. This is used when position accuracy is inadequate or
when operating at airports or runways not in the terrain
database. Selection of Terrain Inhibit does not cause the Terrain
Inoperative annunciation unless the aircraft is wired for
this to occur. Terrain Inhibit requires manual deactivation.
The EGPWS Flap or Gear Over-ride, TAD/TCF Inhibit, or other
switches (as installed) may be used as required for an
emergency situation (e.g., landing gear up).
For additional information refer to an applicable AFM or
EGPWS AFMS or contact Honeywell.
Emergency
Procedures
Mode 5
Descent
Below
Glideslope
continued
060-4241-000 • Rev. E - December 2003
MK V & MK VII EGPWS Pilot Guide 55
Acronyms shall be interpreted as shown:
AFM Airplane Flight Manual
AFMS Airplane Flight Manual Supplement
AGL Above Ground Level
AHRS Attitude/Heading Reference System
AOA Angle of Attack
ASL Above Sea Level
ATC Air Traffic Control
BIT Built In Test
CFIT Controlled Flight into Terrain
CTC Computed Terrain Clearance
dB Decibels
DH Decision Height
EFIS Electronic Flight Instrument System
EGPWC/S Enhanced Ground Proximity
Warning Computer/Systems
FAA Federal Aviation Administration
FMS Flight Management System
FPM Feet Per Minute
F/W Fail Warning
GPS Global Positioning System
GPWS Ground Proximity Warning System
G/S Glideslope
HDOP Horizontal Dilution of Precision
HFOM Horizontal Figure of Merit
HIL Horizontal Integrity Limit
Hz Hertz (cps)
ICD Interface Control Document
ILS Instrument Landing System
INOP Inoperative
IRS Inertial Reference System
IVS Inertial Vertical Speed
MCP Mode Control Panel
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