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aircraft types. Mode 7 provides windshear caution and/or
warning alerts when an EGPWS windshear threshold is exceeded.
The EGPWS adds to these 7 basic functions the ability to compare
the aircraft position to an internal database and provide
additional alerting and display capabilities for enhanced situational
awareness and safety (hence the term “Enhanced”
GPWS).
The EGPWS internal database consists of four sub-sets:
1. A worldwide terrain database of varying degrees of resolution.
2. An obstacles database containing cataloged obstacles 100
feet or greater in height located within North America, portions
of Europe and portions of the Caribbean (expanding
as data is obtained).
3. A worldwide airport database containing information on
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 website
www.egpws.com.
4. An Envelope Modulation database to support the Envelope
Modulation feature discussed later.
EGPWS
Database
060-4241-000 • Rev. E - December 2003
MK V & MK VII EGPWS Pilot Guide 7
Honeywell is constantly striving to improve the EGPWS database
in content, resolution, and accuracy. Notification of a
Database update is accomplished by Service Bulletin. Database
updates are distributed on PCMCIA data cards and
downloaded via a card slot in the front panel of each EGPWC.
Contact Honeywell for additional information.
Because the overwhelming majority of “Controlled Flight Into
Terrain” (CFIT) accidents occur near an airport, and the fact
that aircraft operate in close proximity to terrain near an airport,
and to address prevention of airport runway/taxiway
incursions, the terrain database contains higher resolution
grids for airport areas. Lower resolution grids are used outside
airport areas where aircraft enroute altitude make CFIT
accidents less likely and terrain feature detail is less important
to the flight crew.
With the use of accurate GPS or FMS information, the EGPWS
is provided present position, track, and ground speed. With
this information the EGPWS is able to present a graphical plan
view of the aircraft relative to the terrain and advise the flight
crew of a potential conflict with the terrain or obstacle. Conflicts
are recognized and alerts provided when terrain violates
specific computed envelope boundaries on the projected flight
path of the aircraft. Alerts are provided in the form of visual
light annunciation of a caution or warning, audio enunciation
based on the type of conflict, and color enhanced visual display
of the terrain or obstacle relative to the forward look of the aircraft.
The terrain display is provided on the Weather Radar
Indicator, EFIS display, or a dedicated EGPWS display and may
or may not be displayed automatically.
Also available with high integrity GPS data is alerting advisory
information to help prevent runway/taxiway incursions
in the form of audio advisory alerts.
The following sections provide functional descriptions of the
EGPWS basic and enhanced functions and features, and system
input and output requirements.
EGPWS
Database
continued
060-4241-000 • Rev. E - December 2003
8 MK V & MK VII EGPWS Pilot Guide
BASIC FUNCTIONS:
MODE 1
Excessive
Descent
Rate
Mode 1 provides alerts for excessive descent rates with respect
to altitude AGL and is active for all phases of flight. This mode
has inner and outer alert boundaries as illustrated in the
diagram and graph below.
Penetration of the outer boundary activates the EGPWS caution
lights and “SINKRATE, SINKRATE” alert enunciation.
Additional “SINKRATE, SINKRATE ” messages will occur for
each 20% degradation in altitude.
Penetration of the inner boundary activates the EGPWS
warning lights and changes the audio message to “PULL UP”
which repeats continuously until the inner warning boundary
is exited.
Note: “Pull Up” may be preceded by “Whoop, Whoop” in
some configurations based on the audio menu option selected.
If a valid ILS Glideslope front course is received and the aircraft
is above the glideslope centerline, the outer (sinkrate)
boundary is adjusted to desensitize the sinkrate alerting. This
is to prevent unwanted alerts when the aircraft is safely
capturing the glideslope (or repositioning to the centerline)
from above the beam.
R a d i o A l t i t u d e ( F E E T ) D
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