Color Terrain Elevation
Solid Red. Terrain Threat Area - Warning.
Solid Yellow. Terrain Threat Area - Caution.
50% Red Dots. Terrain that is more than 2000 feet above aircraft altitude.
50% Yellow Dots. Terrain that is between 1000 and 2000 feet above aircraft altitude.
25% Yellow Dots. Terrain 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 areas are within range on the display.Highest terrain not within 500 (250 with gear down) feet of aircraft altitude.
50% Green Dots. Terrain that is 500 (250 with gear down) feet below to 1000 below aircraft altitude. OR Terrain that is the middle elevation band when there are no Red or Yellow terrain areas within range on the display.
16% Green Dots. Terrain that is 1000 to 2000 feet below aircraft altitude. OR Terrain that is the lower elevation band when there are no Red or Yellow terrain areas within range on the display.
Black. No significant terrain.
16% Cyan. Terrain Elevation equal to 0 feet MSL (Optional requires compatible display) .
Magenta Dots. Unknown terrain.
Copyright . The Boeing Company. See title page for details.
15.20.16 June 4, 2004
Warning Systems -System Description 737 Operations Manual
The Peaks Mode display adds a new solid green level to indicate the highest, non-threatening terrain The existing lower density green display patterns now indicate mid and upper terrain in the display area as well as terrain that is within 2000 feet below the aircraft. The red yellow dot patterns are unchanged and continue to indicate terrain that is near or above the current altitude of the aircraft. Solid yellow and red colors are unchanged and continue to indicate alert and warning areas relative to the flight path of the aircraft. Terrain identified as water (0 Ft. MSL) may optionally be displayed as cyan color dot patterns if the aircraft display hardware supports the color cyan. The Peaks Mode display is prioritized such that higher level colors and densities override lower color and densities for maximum situational awareness of the most significant terrain relative to the altitude and flight path of the aircraft.
Peaks Mode display is enabled via a Program Pin during aircraft installation of EGPWS. Customers may choose from the current “standard” terrain display, or the “Peaks Mode” display. Pilot selection between “standard” and ‘Peaks Mode” is not available. Configurable display options, including the water display option, are defined within the EGPWS computer.
Peaks Mode Terrain Display - Aircraft at Low Relative Altitude
Warning Systems -System Description 737 Operations Manual
50% Red
Ref Altitude +2000
50% Yellow
Ref Altitude +1000
Ref Altitude -250/500 25% Yellow
Black
Cyan Sea Level
Peaks Mode Terrain Display - Aircraft at High Relative Altitude
Cautions and Warnings
EGPWS provides the following alerts:
.
Look-ahead terrain caution
.
Look-ahead terrain warning
.
Look-ahead obstacle caution
.
Look-ahead obstacle warning
.
Terrain clearance floor caution. “TERRAIN AHEAD,” “CAUTION TERRAIN,” and “CAUTION OBSTACLE” aural warnings are triggered approximately 60 seconds from impact. Additionally, the amber GPWS light is illuminated and the appropriate section of the TAD on
the EHSI will be colored solid yellow. If the terrain display function is not
selected, the display will automatically appear.
“TERRAIN, TERRAIN, PULL UP,” or “OBSTACLE, OBSTACLE, PULL UP”
aural warnings are triggered approximately 30 seconds from impact. Additionally, the red PULL UP light is illuminated and the appropriate section of the TAD on the EHSI will be colored solid red. If the terrain display function is not selected, the display will automatically appear.
Copyright . The Boeing Company. See title page for details.
15.20.18 August 1, 2003
Warning Systems -System Description 737 Operations Manual
Terrain Clearance Floor
Obstacle Alerts
Aural Alert Visual Alert Description
OBSTACLE PULL UP on both 20 to 30 seconds from projected impact with
OBSTACLE attitude indicators terrain shown solid red on the EHSI (in MAP,
PULL UP Red OBSTACLE message on EHSI (all modes) Solid red terrain on EHSI MAP CTR, VOR, or APP modes only). Moving the ground proximity terrain inhibit switch to TERRAIN INHIBIT inhibits the alert.
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