737 Flight Crew Operations Manual
Warning Systems -
Controls and Indicators
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
15.10.12 D6-27370-866-EGP
1 Terrain D isplay
Note: In areas without terrain data, look-ahead terrain alerting and display
functions are not available. Radio altitude based terrain alerts function
normally.
Note: Terrain within 200 feet of the nearest airport runway elevation does not
show.
Automatically shows when:
• a look-ahead terrain alert occurs, and
• neither pilot has the terrain display selected, and
• in expanded MAP, center MAP, expanded VOR, or expanded APP
modes.
Updates with a display sweep, similar to weather radar display.
2 Terrain Mode Annunciation
TERR (cyan) – Terrain display enabled (manual or automatic display).
3 Look-Ahead Alert
Shows in all navigation display modes.
Graphical representation of surrounding terrain and obstacles.
When the airplane is 500 feet or more above the highest terrain in the selected
display range, terrain is depicted in green, and color density varies based on
terrain elevation:
• Solid green: Highest elevation terrain
• High-density dotted green: Intermediate elevation terrain
• Low-density dotted green: Lowest elevation terrain
• Black: No significant terrain
When the airplane is less than 500 feet above the highest terrain in the selected
display range, color and density vary based on terrain elevation vs. airplane
altitude:
• Solid red: Look-ahead terrain warning active
• Solid amber: Look-ahead terrain caution active
• Dotted red: Terrain more than 2,000 feet above airplane’s current
altitude
• Dotted amber: Terrain 500 feet (250 feet with gear down) below to
2,000 feet above the airplane’s current altitude
• Dotted green: Terrain from 2,000 feet below to 500 feet (250 feet
with gear down) below the airplane’s current altitude
• Black: No significant terrain
• Dotted magenta: No terrain data available
March 28, 2013
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