Hdg (Number 10) - Garmin G1000 Line Maintenance Manual

Uncontrolled if Printed
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4. Make sure a cell phone or Wi-Fi/Bluetooth technology is not turned on in the
cabin (even in a monitoring state).
5. Check the GPS strength bars on both GPS receivers on the GPS 1 or GPS 2
Status Display on the MFD. If the signal strength levels are erratic, 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.
6. Make sure the aircraft is not parked near a hanger equipped with a GPS repeater
with its doors open.
7. Make sure the GIAs are online. If a GIA is not online, check for power input faults.

4.3.10 HDG (Number 10)

1. Check for GMU or GRS configuration, software or failed data path error
messages. Correct any errors before proceeding.
2. Make sure metal objects (tool boxes, power carts, etc.) are not interfering with the
magnetometer. Make sure the aircraft is not in a hangar, near other buildings,
parked over metal drainage culverts or on hard surfaces that may contain steel
reinforcements.
3. Make sure that a cell phone or a device using cell phone technology is not turned
on in the cabin (even in a monitoring state).
4. Cycle power after moving the aircraft away from metal objects to find whether or
not metal objects were the source of the interference. Allow up to five minutes for
the heading to reinitialize.
5. Perform a Magnetometer Interference Test to check for interference from on-
board electrical system components (e.g. NAV lights). Pay attention to any new
electrical devices that have been installed since the aircraft was new. Correct any
discrepancies that do not allow this test to pass before continuing.
6. Make sure the GRS 79 and GMU 44/44B connectors are secure.
7. Check the wiring and any in-line connectors between the GRS and GMU.
8. Recalibrate the GMU 44/44B.
9. Replace the GMU 44/44B.
10. Replace the GRS 79 if the problem persists
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Page 4-6 LMM for the Kodiak 100
190-02102-00 Rev.4