SC 063 INSTRUCTION MANUAL
56-101-01200, Rev. D OPER.
September
/ 9 / 2010 Page 13 of 20
F. Align the Aircraft as nearly as possible (not to exceed 5 degrees error) to magnetic
South (180°).
G. Turn the N-S screw to remove one-half of the error between the Aircraft Compass and
the Sight Compass.
H. Align the Aircraft as nearly as possible (not to exceed 5 degrees error) to magnetic
West (270°).
I. Turn the E-W screw to remove one-half of the error between the Aircraft Compass and
the Sight Compass.
7. COMPASS SWINGING PROCEDURE
A. Prepare a worksheet similar to the one shown in Table 1 by first making a copy of the
blank worksheet as shown in Table 2 then populating it with the data recorded and
calculated by accomplishing the steps that follow..
B. Starting on any convenient 30 degree heading, align the Aircraft so that the Sight
Compass reads within 5 degrees of the desired heading.
C. Record the Aircraft Compass reading in column 2 and the Sight Compass reading in
column 3 adjacent to the appropriate heading in column 1.
D. Repeat steps 7(B) and 7(C) for each subsequent 30 degree heading.
E. Record the difference between the readings of the Aircraft and Sight Compass readings
in column 4.
NOTE: If the Aircraft Compass reads higher than the Sight Compass, the error is
positive (+). If the Aircraft Compass is less than the Sight Compass, the error
is negative (-).
F. Add or subtract the Compass errors in column 4, to or from, respectively, the desired
headings in column 1. Enter the results in column 5. Refer to Table 1 as a guide to
these calculations.
G. There should not be more than plus or minus 10° difference between any of the aircraft
compass readings and the Sight Compass readings. If the aircraft compass cannot be
adjusted to meet the requirements, install another one.
H. Enter the values from column 5 in the “STEER” portion of the Aircraft Compass
correction card.
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