Section 7
Columbia 400 (LC41-550FG)
Description of the Airplane and Systems
Initial Issue of Manual: November 10, 2004
RC050002
Latest Revision Level/Date: A/12-01-2004
7-125
2. If “RAIM POSITION WARNING” message is displayed, the system will flag and no longer
provide GPS based navigational guidance. The crew should revert to the GNS 430 VOR/ILS
receiver or an alternate means of navigation other than the GNS 430’s GPS Receiver.
3. If “RAIM IS NOT AVAILABLE” message is displayed in the en route, 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 GNS 430’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 the GNS 430’s VOR/ILS receiver or another IFR-approved
navigation system.
4. 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.
5. In an in-flight emergency, depressing and holding the Com transfer button for 2 seconds will
select the emergency frequency of 121.500 MHz into the “Active” frequency window.
6. If either Com 1 or Com 2 seems to be functioning abnormally, the GNS 430 display may
show the Coms are transmitting when they are not. In this situation, reset the Com 1 or Com
2 circuit breakers.
Normal Operations –
Refer to the Garmin
GNS 430 Pilot’s Guide and Reference
for detailed
operation procedures. The following items are discussed here for emphasis and clarity.
Pilot’s Displays –
Both No. 1 and No. 2 GNS 430 System data will appear on the PFD. The
source of data is either GPS or VLOC as annunciated on the display above the CDI key on the
top GNS 430 unit.
Autopilot/Flight Director Operation –
Coupling of the No. 1 (top) GNS 430 System steering
information to the autopilot/flight director can be accomplished by engaging the autopilot/flight
director in the NAV or APR mode. The autopilot cannot be coupled to the No. 2 (bottom) GNS
430 unit.
When the autopilot/flight director system is using course information supplied by the GNS 430
System and the course pointer is not automatically driven to the desired track, the course pointer
on the HSI must be manually set to the desired track (DTK) indicated by the GNS 430. For
detailed autopilot operational instructions, refer to the Autopilot Pilot’s Operating Handbook and
discussion on page 7-142.
Crossfill Operations –
Crossfill capabilities (the ability to enter data into one unit that can then
be used in the second unit) exist between the GNS 430 systems. Refer to the Garmin
GNS 430
Pilot’s Guide
for detailed crossfill operating instructions.
Automatic Localizer Course Capture –
By default, the GNS 430 automatic localizer course
capture feature is enabled. This feature provides a method for system navigation data present on
the external indicators to be switched automatically from GPS guidance to localizer/glideslope
guidance as the aircraft approaches the localizer course inbound to the final approach fix. If an
offset from the final approach course is being flown, it is possible that the automatic switch from