Garmin G1000H Pilot's Manual page 89

A ground line (Figure 2-49) is shown on the Altimeter to display the aircraft' s height relative to the ground.
If the data becomes invalid, the message "RA FAIL" is displayed in yellow in place of the current radar height
(Figure 2-50).
190-01255-00 Rev. A
Radar Altimeter
Minimums Box
Figure 2-49 Altimeter Displaying the Ground Line (RAD ALT)
Figure 2-50 Radar Altimeter Invalid Data
Garmin G1000H Pilot's Guide for the Bell 407GX
™
FLIGHT INSTRUMENTS
Ground
Line
77