Instruction Manual

Instructions for Continued Airworthiness 190-01190-11 Rev. 1
for G500H in Robinson R44 Series Rotorcraft Page 13 of 20
Alert Text Cause Solution
GDU (1/2) VOLTAGE GDU supply voltage is below 12
VDC.
Increase the voltage above 12VDC.
This alert is normal in 14V aircraft that are
running on the battery only and should
clear once the aircraft engine is started
and the alternator/generator is carrying
the load.
GEO LIMITS Location is too far north/south for
GRS 77H magnetic compass.
GPS(1/2)
Communication with GPS1 or GPS2
lost.
Ensure GPS (1/2) is turned on
Verify RS-232 wiring from the GPS to the
GDU 620.
GPS(1/2) PPS Failure This alert will display if the PPS
signal has not been received in
more than 5 sec. If the unit is
configured for dual GPSs then the
side will be specified in the error.
Ensure GPS (1/2) is turned on
Verify 1PPS wiring from the GPS to the
GDU 620.
GSR FAIL GSR has failed Check if GSR power discrete is on and
GSR status discrete is off at the same
time
Verify wiring between the GDU and the
GSR
Check power and ground wires on GSR
56
HDG FAULT AHRS magnetometer fault has
occurred.
GRS 77H not receiving information from
GMU 44. Verify wiring to GMU 44.
HDG LOST Heading from the GRS77/ GMU 44
is not valid.
Caused by a local magnetic anomaly. No
action required.
<LRU> SERVICE Specific LRU should be serviced,
where <LRU> denotes specific
LRU.
Return indicated LRU to Garmin for
service.
MANIFEST GDU has received product data for
an LRU that should have a manifest
entry, but is not in the manifest.
Ensure the manifest is properly
configured.
The LRU software P/N and version
number in the manifest does not
match the values being reported by
that LRU.
Update the LRU software to match the
manifest
Update the manifest to match the LRU
software
NAV(1/2) No navigation receiver data from
Nav 1 or Nav 2.
REGISTER GFDS
Data services are inoperative,
register w/ GFDS.
Registered the GSR 56 with Garmin Flight
Data Services to receive weather data.
SIMULATOR The simulator mode is active. Ensure P6202-36 is not grounded.
SVT DISABLED - Out of
available terrain region.
Location is beyond region covered
by terrain database.
SVT DISABLED - Terrain DB
resolution too low.
A 30 arc-second terrain database is
being used.
Update the Supplemental Data card with
the 9 arc-second terrain database.