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.
D6-27370-866-EGP 15.10.13
TERRAIN
• Red – look-ahead terrain warning alert active.
• Amber – look-ahead terrain caution alert active.
OBSTACLE
• Red – obstacle warning alert active.
• Amber – obstacle caution alert active.
4 TERR (Terrain) Elevation Number
Displays elevation of highest and lowest terrain. The color of the elevation
number corresponds to the terrain elevation:
• Green – terrain elevation is more than 500 ft below airplane altitude.
• Amber – terrain elevation is between 500 ft below and 2000 ft above
airplane altitude
• Red – terrain elevation is more than 2000 ft above airplane altitude
Note: Values displayed are applicable to terrain that is generally ahead of the
airplane flight path. Terrain near the left and right margins of the display
may not be included in the calculations.
Predictive Windshear Display and Annunciations
1 Predictive Windshear Symbol
Displayed (red and black) – Predictive windshear alert active.
Shows windshear location and approximate geometric size (width and depth).
1
NAVIGATION DISPLAY - PFD
2
3
March 28, 2013
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