Cub Crafters CC18-180 Pilot Operating Handbook page 199

CUB CRAFTERS SECTION 9.2
CC18-180 SUPPLEMENTS-GNC 420
If "RAIM IS NOT AVAILABLE" message is displayed in the
enroute, terminal, or initial approach phase of flight,
continue to navigate using the GPS equipment or revert to
an alternate means of navigation other than the GNC 420's
GPS receiver appropriate to the route and phase of flight.
When continuing to use GPS navigation, position must be
verified every 15 minutes using another IFR-approved
navigation system.
If "RAIM IS NOT AVAILABLE" message is displayed while
on the final approach segment, GPS based navigation will
continue for up to 5 minutes with approach CDI sensitivity
(0.3 nautical mile). After 5 minutes the system will flag and
no longer provide course guidance with approach
sensitivity. Missed approach course guidance may still be
available with 1 nautical mile CDI sensitivity by executing
the missed approach.
If the white "TER N/A" status annunciator is displayed by
the GNC 420, the system will no longer provide TERRAIN
alerting or display relative terrain elevations. The crew
must maintain compliance with procedures that ensure
minimum terrain separation.
If the red "TER FAIL" status annunciator is displayed by
the GNC 420, the system will no longer provide TERRAIN
alerting or display relative terrain elevations. The crew
must maintain compliance with procedures that ensure
minimum terrain separation.
If a "TERRAIN has failed" or a "TERRAIN has failed"
message is displayed by the GNC 420, the system will no
longer provide TERRAIN alerting or display relative terrain
elevations. The crew must maintain compliance with
procedures that ensure minimum terrain separation.
Issued: 5/31/05 REPORT TC10000AFM
Date of revision: 12/06/05 Page number 9-2-7