G900X/G950 Installation and Maintenance Manual – Troubleshooting
Page D-45
190-00719-00
Revision D
D.6.2 GPS
Symptom Recommended
Action
Will not acquire satellites
•
Ensure that a cell phone or a device using cell phone technology
is not turned on (even in a monitoring state) in the cabin.
•
Check for possible external interference to the GPS
receivers.
−
Ensure that a cell phone or a device using cell phone
technology is not turned on (even in a monitoring state)
in the cabin.
−
Turn to the GPS page on the MFD and check the GPS
strength bars on both GPS receivers. If the signal
strength level is erratic, or they disappear and reappear
rapidly, or switch between a solid and hollow bar
frequently there is an external device interfering with the
GPS receivers. Turn off any devices that radiate a signal
in the local area or move the aircraft to another location
to remove the interference.
•
Check date and time on Date/Time Setup Page.
−
If date and time are incorrect, enter the correct date and time.
•
Switch GIA1 and GIA2, to verify location of problem:
−
If problem follows unit, clear the GPS almanac by performing
the following steps –
Using the PFD in config mode, go to the GIA RS-
232/ARNIC 429 Config Page.
At the top of the screen, select the GIA that can not
acquire satellites (GIA1 or GIA2) and press the ENT key.
Press the “CLR NV” softkey at the bottom of the screen.
Select “OK” in the “Clear GIA nonvolatile memory?” pop-
up window.
Next reload GIA Audio and Config files from a loader
card. Be sure to reload the config files for any optional
equipment installed on the aircraft that require the GIA
config to be updated.
•
Cycle power on the system and allow it to restart in normal mode.
Place the aircraft outside and allow 15-30 minutes for the GPS to
acquire a position and download a new almanac.
−
If clearing nonvolatile memory is unsuccessful and the GPS
still can not acquire a position, replace the GIA.
•
If problem does not follow unit, check GPS antenna and cabling.
