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4. DETERMINATION OF THE MAGNETIC HEADING OF AN AIRCRAFT
A.
Standing at least 30 feet from the Aircraft, the observer aligns himself with its
longitudinal axis by reference to a radio mast and fin, row of central fuselage rivets or
any suitable line or pair of objects on the Aircraft, and with a hand held Sight Compass,
sights on one of the objects used for alignment. The Sight Compass is read when
steadied. The reading obtained is the magnetic heading of the Aircraft if the observer is
in front of the Aircraft.
B.
When using the Sight Compass, the Aircraft's nose is placed on the desired heading
according to the Aircraft Compass. Alignment on the heading need not be exact, but
should be within 5 degrees.
C. The Sight Compass should be supported and held at a comfortable reading distance
from the eye.
steadying the Compass. Again the observer must take care to remove all magnetic
material from his person prior to using the Sight Compass.
5. PRECOMPENSATION AND PRESWING INSTRUCTIONS
A.
When using the Compass, the operator stands directly in front of the aircraft at a
minimum distance of 30 feet, preferably 50 feet or more.
B.
The Compass is held as nearly level as possible and sighted through the sighting lens
to the exact center of the aircraft.
C. Sufficient time should be allowed for the Sight Compass to stabilize before taking
readings. It is best to take a series of three readings before assuming that the readings
are correct.
D. Normal procedure is to either taxi or tow the aircraft to approximately the desired
heading as read on the Compass to be compensated (within 5 degrees).
E.
The operator using the Sight Compass, then standing directly in front of the aircraft and
with the Sight properly lined on the center line of the aircraft, observes the exact
heading on which the aircraft is positioned, and notes any error that exists between the
Sight Compass and the Aircraft Compass being compensated.
F.
Whatever error exists between the Sight Compass and the Aircraft heading is then
corrected by moving the Aircraft the number of degrees difference existing until such
time as the Aircraft heading and the reading of the Sight Compass are corrected for the
desired heading (within 5 degrees).
G. It is of the utmost importance that during the swinging procedure a minimum distance of
30 feet be maintained between the Aircraft being swung and the operator using the
Sight Compass. Also, the operator and the Sight Compass must be a minimum of 50
feet from any other Aircraft, or at least 100 feet from any large building, power lines, or
heavy objects which might cause interference.
56-101-01200, Rev. D
September / 9 / 2010
SC 063 INSTRUCTION MANUAL
A monopod is supplied with the SC 063 Sight Compass to aid in
OPER.
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