Gps - Garmin CIRRUS PERSPECTIVE SR20 Line Maintenance Manual

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5.8.2 GPS
Symptom
Will not acquire satellites
Cirrus Perspective™ Line Maintenance Manual
190-00920-00
•
Make sure 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 by
turning 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.
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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 cannot
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, see Section 7 for instructions. 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 cannot acquire a position, replace the GIA.
•
Check GPS antenna and cabling.
Recommended Action
Page 5-65
Rev. E