G1000 / GFC 700 System Maintenance Manual - 300/B300 Series King Air
Page 5-73
190-00716-01
Revision 1
NOTE
It is important that the “time equals zero” moment corresponds with the moment the PFD
first displays the blinking TEST COMPLETE? Message.
7.
The operator should carry out the actions called for in the prepared test sequence.
NOTE
It is important that all actions are carried out in the order and at the precise elapsed time
as specified in the prepared test sequence.
8.
When the operator has completed the actions specified in the test sequence, press the ENTER button
to indicate that the process is complete. When this is done, the TEST COMPLETE field stops
blinking.
9.
PFD1 informs the operator if the installation has passed or failed the magnetometer interference test.
If the test passes, no further action is required for this test.
If the test fails, the installation should be considered unreliable until the source of magnetic interference
is identified and remedied. When the magnetometer interference test fails, record the three magnetometer
maximum deviation values and their corresponding timestamps. Any maximum deviation value greater
than 2.5 milliGauss indicates a problem that must be resolved. Compare the corresponding timestamps
with the prepared test sequence to identify which action produced the problem. Contact Garmin for
assistance in resolving the problem.
NOTE
Three common reasons for a failed magnetometer interference test are: 1) rudder
bellcrank or other structure has become magnetized, 2) new equipment is installed in
close proximity to the GMU 44 magnetometer, and 3) an existing or new electronic
device has become grounded through the aircraft structure instead of via the proper
ground wire in a twisted shielded pair.
10.
Press the ENT key on the PFD to conclude this procedure.
Summary of Contents for Cessna Caravan G1000
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