
190-00498-00 Rev. AGarmin G1000 Pilot’s Guide for Cessna Nav III2-26
PRIMARY FLIGHT DISPLAY
TERRAIN AWARENESS AND WARNING
SYSTEM (TAWS) (OPTIONAL)
NOTE: Refer to the Annunciations & Alerts and
Multi Function Display sections for detailed
TAWS discussions.
Terrain Awareness and Warning System (TAWS)
is only available when the G1000 is configured for
TAWS-B installation. Class B TAWS provides these
principal alerting functions:
• Forward Looking Terrain Avoidance (FLTA) –
which looks ahead of the aircraft along and below
the aircraft’s lateral and vertical flight path and
provides alerts if a potential Controlled Flight into
Terrain (CFIT) threat exists
• Premature Descent Alert (PDA) – uses the aircraft’s
current position and flight path information as
determined from a suitable navigation source
and airport database to determine if the aircraft is
significantly below the normal approach path for
the destination runway
• Excessive Descent Rate Alert (EDR) – when the
aircraft is determined to be closing (descending)
upon terrain at an excessive speed
• Negative Climb Rate Alert (NCR) – when the
system detects the aircraft is losing altitude
(closing upon terrain) after takeoff
• “Five-Hundred” Aural Alert – when the aircraft
descends within 500 feet of the terrain or nearest
runway elevation
The FLTA and PDA features can be disabled to prevent
nuisance alerts while flying VFR into areas where unique
terrain exist and could cause the system to annunciate.
TAWS Alert Annunciations
The following alert annunciations appear on the PFD
and MFD:
Figure 2-42 TAWS Annunciations
TAWS Color Scale
NOTE: Terrain data is not displayed when the
aircraft latitude is greater than 75º N or 60º S.
The G1000 automatically adjusts the color on the Inset
Map as the aircraft altitude changes.
Potential Impact Point
Unlighted Obstacle
Projected Flight Path
1000' AGL
100' Threshold
Figure 2-43 TAWS Colors
Terrain
Color
Terrain/Obstacle
Location
Suggested Pilot
Response
Red
(WARNING)
Terrain/Obstacle within 100
ft of the aircraft altitude
or above
Initiate climb and/or turn
away from terrain/obstacle.
Yellow
(CAUTION)
Terrain/Obstacle within
1000 ft of the aircraft
altitude
Be aware of surroundings.
Be prepared to take action.
Black
(NO DANGER)
Terrain/Obstacle more than
1000 ft below the aircraft
altitude
No action required.
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