SIRS Navigation KCA0101C Component Maintenance Manual With Illustrated Parts List page 43

CAUTION: IN THE PROCEDURE.THAT FOLLOWS, DO NOT MOVE THE
(3) Set the micrometer scale on the test head to be zero. Use the standard
magnetic needle 3252 LMT, to align the sighting vane with the magnetic meridian.
(4) Put the compass card (130) in the balancing bowl and cover the bowl with a sheet
of glass.
BALANCING BOWL
DIVIDED TEST HEAD
(5) Turn the test head slowly and record the reading at each 30° heading. The card
must be replaced if the error is greater than ± 1.5°
The document reference is online, please check the correspondence between the online documentation and the printed version.
SIRS NAVIGATION LTD
COMPONENT MAINTENANCE MANUAL
BALANCING BOWL
GLASS SHEET
COMPASS CARD (130)
MICROMETER SCALE
Heading Errors – Check
Figure 7001
SIGHTING VANE
PAGE 7003
34-25-21
APR 10/03