SC 063 INSTRUCTION MANUAL
56-101-01200, Rev. D OPER.
September
/ 9 / 2010 Page 12 of 20
H. Insofar as possible, all fixed or movable items containing ferrous materials should be
placed in positions they will occupy in flight before beginning the swing.
I. The Compass should be inspected for general serviceability.
J. An Aircraft Compass is easily affected by stray magnetism from electrical circuits and
moveable steel objects. Before swinging the Compass, the aircraft should be
positioned approximately North, East, South and West. On each heading, the
Compass should be observed with the engine(s) operating and indicating generator
charging, and with the engine(s) stopped. If a significant difference is observed, the
swinging should be done with the engines running and charging. Also, on each
heading various electrical components should be turned ON and OFF to determine their
effect on the Compass. A determination must be made as to what equipment will be
used during the Compass swing. In some cases, multiple readings may be required to
cover normal, abnormal and emergency conditions.
K. When swinging the Aircraft, it should be kept (as nearly as possible) in the center of the
chosen area. Since it is easier to move the Sight Compass than the Aircraft, it is not
essential that the Aircraft be precisely positioned on the selected headings. However,
the Aircraft should be within 5 degrees of the desired heading for best results. Also,
during the actual compensating procedure on North, East, South and West, the
alignment should be as close to the exact heading as practical.
6. COMPASS COMPENSATION PROCEDURE
NOTE: All these corrections shall be made using a non-magnetic screwdriver. The
Compass shall be lightly tapped after each adjustment and be allowed time to settle
before taking readings.
A. Set the compensator for zero effect by matching the dots on the compensator screws
with the fixed dots on the case.
B. Align the Aircraft as nearly as possible (not to exceed 5 degrees error) to magnetic
North (0°).
C. Turn the N-S screw to cause the Aircraft Compass to read the same as the Sight
Compass.
D. Align the Aircraft as nearly as possible (not to exceed 5 degrees error) to magnetic East
(90°).
E. Turn the E-W screw to cause the Aircraft Compass to read the same as the Sight
Compass.
CAUTION: IF THE N-S SCREW IS INADVERTENTLY TURNED, THE NORTH
HEADING MUST BE RECHECKED AND COMPENSATED.
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