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altitude.
PEAKS
DISPLAY
continued
High Density
High Density
Low Density
High Density
Low Density
Honeywell MFRD shown
060-4241-000 • Rev. E - December 2003
MK V & MK VII EGPWS Pilot Guide 35
When the aircraft is greater than 500 feet (250 with gear
down) above the terrain in view (no yellow or red displayed),
additional (green) color bands are presented. These added
bands are computed and displayed as a function of the highest
and lowest elevations in view.
The following table indicates the TAD colors and elevations
(Non-Peaks and Peaks).
PEAKS
DISPLAY
continued
Color Indication
Solid Red Terrain/Obstacle Threat Area – Warning.
Solid Yellow Terrain/Obstacle Threat Area – Caution.
High Density Terrain/Obstacle that is more than 2000 feet
above aircraft altitude.
High Density Terrain/Obstacle that is between 1000 and 2000
feet above aircraft altitude.
Low Density Terrain/Obstacle that is 500 (250 with gear
down) feet below to 1000 feet above aircraft altitude.
Solid Green Shown only when no Red or Yellow terrain
(Peaks only) /Obstacle areas are within range on the display.
Highest terrain/Obstacle not within 500 (250
with gear down) feet of aircraft altitude.
High Density Terrain/Obstacle that is 500 (250 with gear
down) feet below to 1000 below aircraft altitude.
(Peaks only) Terrain/Obstacle that is the middle elevation
band when there is no Red or Yellow terrain areas
within range on the display.
Low Density Terrain/Obstacle that is 1000 to 2000 feet below
aircraft altitude.
(Peaks only) Terrain/Obstacle that is the lower elevation band
when there is no Red or Yellow terrain areas
within range on the display.
Black No significant terrain/Obstacle.
Low Density Cyan Water at sea level elevation (0 feet MSL).
Magenta Fill Unknown terrain. No terrain data in the database
for the magenta area shown.
Note: magenta may be displayed at or near the South and North Poles
dependent upon the airplane flight path and location.
Red Fill
Yellow Fill
Yellow Fill
Green Fill
Green Fill
Fill (Peaks only)
060-4241-000 • Rev. E - December 2003
36 MK V & MK VII EGPWS Pilot Guide
TCF/TAD
INOP and
INHIBIT
Geometric
Altitude
The EGPWS TCF and TAD functions are available when all
required data is present and acceptable. Aircraft position and
numerous other parameters are monitored and verified for
adequacy in order to perform these functions. If determined
invalid or unavailable, the system will display Terrain
inoperative or unavailable annunciations and discontinue the
terrain display if active.
TAD/TCF functions may be inhibited by manual selection of a
cockpit Terrain Inhibit switch. Neither loss nor inhibiting TAD/
TCF effects the basic GPWS functions (modes 1-7).
If Peaks display mode is not active and TAD becomes unavailable
due to position error, terrain inoperative or
unavailable is not indicated if the aircraft is greater than 8000
feet above the highest terrain or obstacle within a 320nm radius.
If indicated below the 8000 foot threshold, it is
extinguished when the aircraft climbs above, and is again displayed
once the aircraft descends below the 8000 foot
threshold. This eliminates potentially longterm illumination of
the condition during the high enroute phase of flight.
Based on GPS altitude, geometric altitude is a computed
pseudo-barometric altitude (Above Sea Level - ASL) designed
to reduce or eliminate errors potentially induced in Corrected
Barometric Altitude by temperature extremes, non-standard
pressure altitude conditions, and altimeter miss-sets. This
ensures an optimal EGPWS Terrain Alerting and Display
capability. Geometric Altitude also allows EGPWS operations in
QFE environments without custom inputs or special
operational proceedures.
Geometric Altitude requires GPS Altitude input with its associated
Vertical Figure Of Merit (VFOM) and
Receiver Autonomous Integrity Monitoring (RAIM) failure
indication, standard (uncorrected) altitude, Radio Altitude,
Ground Speed, Roll Angle, and aircraft position (Latitude and
Longitude). Additionally, corrected Barometric Altitude, Static
Air Temperature (SAT), GPS mode, and the number of
satellites tracked are used if available.
The Geometric Altitude is computed by blending a calculated
Non-Standard Altitude, Runway Calibrated Altitude
(determined during takeoff), GPS Calibrated Altitude, Radio
060-4241-000 • Rev. E - December 2003
MK V & MK VII EGPWS Pilot Guide 37
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