SIL 3308-10 PG INSERT
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SN3308 PILOT’S GUIDE INSERT
Ref:
Sandel Service Letter 3308-10
Applicability: SN3308 Pilot’s Guide 82001-PG Rev C and
previous.
Instructions:
In the Flags and Abnormal Conditions section of the SN3308 Pilot’s
Guide update as follows:
1)
Under the CONDITION column, line out the words
“Fluxgate failure” and replace with
FLUXGATE TOTAL
ELECTRICAL FAILURE”
2)
In the DISPLAY column, to the right of Fast Slave Mode,
write “
See PG Insert
” to refer to the following information:
The following explanation applies when the SN3308 is installed
using ‘internal slaving’. This is an installation-selected mode and
is used with most remote DG’s such as KG102 or Mid Continent.
A fluxgate is an electronic compass sensor, with most of the
characteristics of a wet compass. The fluxgate is the only sensor
which provides heading to the SN3308. The remote Directional
Gyro turns the SN3308 compass card directly, but does not know
which way North is. The fluxgate supplies North and thereby the
SN3308 ensures correct compass card orientation, slowly and
continually correcting for gyro drift by using the North input from
the fluxgate. This correction occurs at 3 deg/minute. It is
imperceptible in flight.
