Honeywell MK VI Pilot's Manual page 30

Terrain
Alerting
and Display
continued
30
When the warning ribbon is intruded (typically 30 seconds prior
to the terrain/obstacle conflict), EGPWS warning lights activate
and the aural message "TERRAIN, TERRAIN, PULL UP" or
"TERRAIN AHEAD, PULL UP" or "OBSTACLE, OBSTACLE,
PULL UP" or "OBSTACLE AHEAD, PULL UP" is enunciated
with "PULL UP" repeating continuously while the conflict is
within the warning area.
The look-ahead alerting algorithms are enhanced at higher air-
speeds (about 300 Knots or greater). In this case, the look-ahead
distance is designed to provide a 60-second warning alert for up
to 8 nm look-ahead. With version -022 and later, the look-ahead
distance is increased for descents at high speeds to improve alert-
ing times.
The specific voice message provided is determined during the ini-
tial installation of the EGPWS as a function of enabling the terrain
and obstacles features and the selected audio menu.
Refer to an applicable AFM or EGPWS AFMS for specific applica-
tion information or contact Honeywell for additional information.
When a compatible Weather Radar, EFIS, or other display is
available, the EGPWS Terrain Alerting and Display (TAD) feature
can provide an image of the surrounding terrain represented in
various colors and intensities. TAD, Peaks, and Obstacle func-
tions are enabled by EGPWS options defined in the installation
configuration.
Two types of TAD displays are available depending on the display
system and options selected. Non-peaks display provides a ter-
rain image only when the aircraft is 2000 feet or less above the
terrain. The second type called "Peaks" enhances the display
characteristics to provide a higher degree of terrain awareness
independent of the aircraft altitude. In either case, terrain and
obstacles (if enabled) forward of the aircraft and within the range
selected are displayed. Obstacles are presented on the cockpit
display as terrain, employing the same display-coloring scheme.
On some terrain displays, an indication of MSL altitude will
appear. This altitude is the reference altitude for the display
and the terrain awareness algorithm. This reference altitude
is based on internally calculated Geometric Altitude (see page
38) and NOT corrected barometric altitude. It represents the
aircraft's calculated true height above sea level (MSL) and serves
as the reference altitude for color coding of the terrain display
060-4314-000 • Rev. C - May 2004
MK VI & MK VIII EGPWS Pilot Guide