The EGPWS incorporates the functions of the basic Ground
Proximity Warning System (GPWS). This includes the following
Additionally, Windshear alerting (Mode 7) is provided for spe-
cific aircraft types. Mode 7 provides windshear caution and/or
warning alerts when an EGPWS windshear threshold is ex-
The EGPWS adds to these 7 basic functions the ability to com-
pare the aircraft position to an internal database and provide
additional alerting and display capabilities for enhanced situ-
ational awareness and safety (hence the term "Enhanced"
The EGPWS internal database consists of four sub-sets:
1. A worldwide terrain database of varying degrees of resolu-
2. An obstacles database containing cataloged obstacles 100
feet or greater in height located within North America and
portions of the Caribbean (expanding as data is obtained).
3. A worldwide airport database containing information on
hard-surface runways 3500 feet or longer in length. For a
specific list of the airports included, refer to Honeywell
document 060-4267-000 or access on the Internet at
4. An Envelope Modulation database to support the Envelope
Modulation feature discussed later.
060-4241-000 • Rev. D - March 2000
MK V & MK VII EGPWS Pilot Guide