TM 11-4920-292-15
OPERATING INSTRUCTIONS FOR ELECTRICAL COMPASS SYSTEM CALIBRATION
(5) Aircraft stand or ladder that will
General
reach compass transmitter location.
a. The electrical compass system calibration
is a two-part procedure: part one consists of an
mon names for the compass calibrator and its
area magnetic survey, and part two consists
components.
of an electrical compass swing. An area mag-
netic survey is the selection of a proper area to
9-3. Equipment Setup
be used as a compass swing site, The survey
must establish the magnetic acceptability of the
a. Remove the following equipment from
area, a north-south reference line for aligning
the compass calibrator case:
the aircraft, and the location of the turntable as-
(1) Tripod (two required).
sembly and the monitor assembly for each air-
(2) Magnetic field monitor.
craft type to be calibrated. The survey is to be
performed annually, and as necessary to add
(3) Remote transmitter turntable.
turntable assembly locations to accommodate
(4) Control console.
new aircraft types. Operating instructions for
(5) 400-cycle power supply.
an area magnetic survey are contained in para-
(6) Alignment equipment.
(7) Cable (W1) and reel.
NOTE
(8) Cable (W2) and reel.
An area magnetic survey must be per-
(9) Cable (W3) and reel.
formed prior to an electrical compass
swing.
b. Place one tripod over the turntable loca-
tion for the aircraft being calibrated (estab-
b. An electrical compass swing is performed
lished during area magnetic survey). Adjust
to calibrate and insure the accurate perform-
the legs to convenient operator height.
ance of the aircraft compass system, This sec-
tion describes the necessary procedures using
c. Remove the turntable assembly from the
the compass calibrator with the MK-1040A/
case and mount it on the tripod.
ASN.
d. Place the second tripod over the monitor
9-2. Equipment Required
location (established during area magnetic sur-
vey). Adjust the legs to convenient operator
a. The equipment listed below is required
height.
to perform an electrical compass swing.
(1) Magnetic Compass Calibrator Set
e. Remove the monitor assembly from the
AN/ASM-339 (V) 1.
case and mount it on the tripod.
(2) Magnetic Compass Set Adapter Kit
f. Place the control console within 10 to 40
MK-1040A/ASN.
feet of the turntable location.
(3) Measuring tape.
(4) Power source: 28 volts dc, 5 amperes
g. Place the 400-cycle power supply 80 feet,
minimum.
or more, away from the other equipment.
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