Garmin GNS 430 - Manual (Page 242)

GNS 430(A) Pilot’s Guide and Reference 190-00140-00 Rev. P
SECTION 14 – MESSAGES,
ABBREVIATIONS, & NAV TERMS
14-6
Not receiving input
data on 429 Channel 2 No data has been received on the ARINC 429 channel 2 connection for a period exceeding
five seconds. If the problem persists, the installation should be checked by a Garmin dealer.
Not receiving input
data on 232 Channel 1 No data has been received on the RS-232 channel 1 connection for a period exceeding ten
seconds. If the problem persists, the installation should be checked by a Garmin dealer.
OBS key stuck
The OBS Key is stuck in the enabled (or pressed) state. Try pressing the OBS Key again to
cycle its operation. If the message persists, contact a Garmin dealer for assistance.
Poor GPS coverage
The GPS receiver cannot acquire a sufficient number of satellites to compute a position and
provide navigation.
Power down and re-
initialize
The GNS 430 cannot calculate a position due to abnormal satellite conditions. The unit is
unusable until power has been cycled off and back on. Abnormal satellite conditions may
exist and the pilot may need to use an alternate means of navigation.
RAIM is not available
Receiver Autonomous Integrity Monitoring (RAIM) has determined that sufficient GPS
satellite coverage does not exist for the current phase of flight. (The CDI/HSI NAV flag also
appears.) Select an alternate source for navigation guidance, such as the GNS 430’s VLOC
receiver.
RAIM not available
from FAF to MAP
waypoints
When performing an instrument approach, Receiver Autonomous Integrity Monitoring (RAIM)
has determined that sufficient GPS satellite coverage does not exist to meet the required
protection limits. Select an alternate source for navigation guidance, such as the GNS 430’s
VLOC receiver (for a VOR or localizer-based approach).
RAIM position warning
Although sufficient GPS satellite coverage may exist, Receiver Autonomous Integrity
Monitoring (RAIM) has determined the information from one or more GPS satellites may
be in error. The resulting GPS position may be in error beyond the limits allowed for the
current phase of flight. Cross-check the position with an alternate navigation source. If the
warning occurs during a final approach segment (FAF to MAP), execute the published missed
approach.
Scheduler message -
[user entered text] The user-entered scheduler message time has expired, and the scheduler message is
displayed.
Searching the sky
The GNS 430 is searching the sky for GPS satellite almanac data or the GPS receiver is in
AutoLocate Mode. Allow the unit to complete data collection (approximately five minutes)
before turning it off.
Select appropriate
frequency for
approach The aircraft is inbound and within 3 nm of the FAF; and the active VLOC frequency does not
match the published frequency for the approach. Tune the standby VLOC frequency to the
proper frequency and press the VLOC Flip-flop Key to ‘activate’ the frequency.