Garmin G900X Pilot's Manual - page 366
Garmin G900X Pilot’s Guide
190-00726-00 Rev. A
6-40
HAZARD AVOIDANCE
FIVE-HUNDRED AURAL ALERT
The purpose of the aural alert message
“Five-hundred”
is to provide an advisory alert that the aircraft is 500
feet above terrain. When the aircraft descends within 500 feet of terrain, the aural message “Five-hundred” is
generated. There are no display annunciations or pop-up alerts that accompany the aural message.
NEGATIVE CLIMB RATE AFTER TAKEOFF ALERT (NCR)
The
Negative Climb Rate (NCR) After Takeoff
alert (also referred to as “Altitude Loss After Takeoff”)
provides alerts when the system determines the aircraft is losing altitude (closing upon terrain) after takeoff.
The aural message “Don’t Sink” is given for NCR alerts, accompanied by an annunciation and a pop-up terrain
alert on the display. NCR alerting is only active when departing from an airport and when the following
conditions are met:
• Height above the terrain is less than 700 feet
• Distance from the departure airport is 2 nm or less
• Heading change from the departure heading is less than 110 degrees
Figure 6-55 shows the NCR alerting parameters as defined by TSO-C151b.
1000
800
600
400
200
Height Above Terrain (Feet
)
Altitude Loss (Feet)
0
20
40
60
80
100
120
140
“DON’T SINK”
“DON’T SINK”
1000
900
800
700
600
500
400
300
200
100
Height Above Terrain (Feet
)
Sink Rate (Feet Per Minute)
0
“DON’T SINK”
“DON’T SINK”
500
1000
1500
2500
3500
2000
3000
4000
Figure 6-55 Negative Climb Rate (NCR) Alert Criteria