Garmin G1000 Pilot's Manual page 437

Alert Type
Reduced Required Terrain Clearance
Warning (RTC)
Imminent Terrain Impact Warning (ITI)
Reduced Required Obstacle Clearance
Warning (ROC)
Imminent Obstacle Impact Warning (IOI)
Reduced Required Terrain Clearance
Caution (RTC)
Imminent Terrain Impact Caution (ITI)
Reduced Required Obstacle Clearance
Caution (ROC)
Imminent Obstacle Impact Caution (IOI)
* Annunciation is displayed on the MFD when terrain display is enabled.
FORWARD LOOKING TERRAIN AVOIDANCE
The Forward Looking Terrain Avoidance (FLTA) feature of Terrain-SVS compares the projected flight path
as derived from GPS data with terrain features and obstacles from the terrain and obstacle databases. The
system issues visual and voice alerts when the projected flight path conflicts with terrain or obstacles.
The projected flight path is a calculated area ahead of, to the sides, and below the aircraft. The size of
the projected flight path varies based on factors including ground speed (the path ahead is larger when the
ground speed is higher), whether the aircraft is level, turning, or descending, and the proximity to the nearest
runway along the current track. As the aircraft approaches the runway, the projected flight path becomes
narrower until the system automatically disables FLTA alerts or the pilot manually inhibits them.
There are two types of FLTA alerts, Reduced Required Terrain/Obstacle Clearance (RTC or ROC respectively)
and Imminent Terrain/Obstacle Impact (ITI or IOI respectively).
Reduced Required Terrain Clearance (RTC) and Reduced Required Obstacle Clearance (ROC)
alerts are issued when the aircraft flight path is above terrain, yet is projected to come within the minimum
clearance values in Figure 6-177. When an RTC alert is issued, a potential impact point is displayed on the
Terrain-SVS Page.
Imminent Terrain Impact (ITI) and Imminent Obstacle Impact (IOI) alerts are issued when the
aircraft is below the elevation of a terrain or obstacle in the aircraft' s projected path. ITI and IOI alerts are
accompanied by a potential impact point displayed on the Terrain-SVS Page. The alert is annunciated when
the projected vertical flight path is calculated to come within minimum clearance altitudes in Figure 6-177.
190-00962-04 Rev. A
PFD/MFD*
Alert Pop-Up Alert (except
Annunciation Terrain-SVS Page)
Table 6-26 Terrain-SVS Alerts Summary
Garmin G1000 Pilot's Guide for the Diamond DA42NG
HAZARD AVOIDANCE
MFD
"Warning; Terrain, Terrain"
"Warning; Terrain, Terrain"
"Warning; Obstacle, Obstacle"
"Warning; Obstacle, Obstacle"
"Caution; Terrain, Terrain"
"Caution; Terrain, Terrain"
"Caution; Obstacle, Obstacle"
"Caution; Obstacle, Obstacle"
Voice Alert
421