Garmin CIRRUS PERSPECTIVE SR20 Line Maintenance Manual page 217

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9. The operator should carry out the actions called for in the prepared test sequence.
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.
10. When the actions in the test sequence have been completed, press the ENTER button to
indicate that the process is complete. When this is done, the TEST COMPLETE field
stops blinking.
11. The PFD 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.
12. 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.
Two common reasons for a failed magnetometer interference test
are: new equipment is installed in close proximity to the GMU 44
magnetometer, and 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.
13. Press the ENT key on the PFD to conclude this procedure.
Cirrus Perspective™ Line Maintenance Manual
190-00920-00
NOTE
NOTE
Page 7-43
Rev. E