Figure 7-59.-Compass correction card.
instrument panel. You can also turn the compass
about the aircraft flux valve to accurately calibrate
a little with relation to the front of the panel and
the compass system. Use of the MC-2 only
placing washers or spacers under its mounting
requires the aircraft be accurately placed on a
screws.
north-south line, thus eliminating the need for
After completing this swing, swing the aircraft
rotating the aircraft on a compass rose. The
again on at least eight equally spaced headings (for
compass calibrator provides electrical heading
example, 0, 45, 90, 135, 180, 225, 270,
inputs from 0 to 345 in 15-degree increments
and 315). Record the compass readings for each
with an accuracy of 0.1. The compass calibrator
heading on a compass correction card. Figure 7-59
can survey an area for magnetic uniformity. It
shows an illustration of a compass correction
also provides the necessary data for layout and
card.
marking of a compass swing site.
Detach the small right-hand portion of the
The compass calibrator consists of four major
compass correction card and mount with the
components--the control console, magnetic field
compass. It is thus available for ready reference,
monitor, remote transmitter turntable, and field
telling the pilot or navigator the comparative
tester. The set also includes various cable
compass headings and magnetic headings. Turn
assemblies, reels, racks, tripods, and some special
the larger portion of the card into maintenance
alignment equipment.
control for insertion into the aircraft logbook.
The control console contains the controls,
indicators, and electronic components that allow
MC-2 Magnetic Compass Calibrator Set
the compass calibrator set to operate. It uses 115
volts, 400 Hz at a maximum of 1 ampere. The
The MC-2 (fig. 7-60) provides a controlled
MC-2 changes this electrical power into ac and
magnetic field (simulated earth's magnetic field)
dc voltages that it requires.
