Garmin G1000 Maintenance Manual page 148

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Due to high winds or excessive airframe vibration, the operator may encounter a
condition where the PFD restarts the 18-second countdown without full
completion of the previous countdown. If this is encountered more than once for
a given station, the operator should begin turning to the next station
(approximately 30°).
required, where a successful station is a full 18-second countdown followed by
instruction to move. Ensure that at least 2 stations per quadrant are completed.
Thus, it may sometimes be required to dwell at a station after a countdown
restart. A maximum of 20 stations is allowed for the entire calibration procedure.
If too many countdown restarts are encountered, the calibration will fail with the
message, "TOO MANY STATIONS." Aircraft rocking from excessive winds may
prevent the calibration from passing. If repeated attempts in windy conditions do
not pass, wait until the winds calm before reattempting this procedure.
15. Repeat the turn-and-stop process until the PFD advises that a successful calibration is
complete. The GRS 77 AHRS then enters its normal operational mode. Press the ENT
button on the PFD to conclude this procedure.
Page 7-22
Rev. B
NOTE
A minimum of 2 successful stations per quadrant is
G1000 System Maintenance Manual
190-00907-00