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Manual Number 9018233, Revision A
Mid-Continent Instruments and Avionics
December 22, 2014
SECTION 4 CALIBRATION
Calibration of the altitude and airspeed functions is possible with a single or dual pressure tester. The
procedure is similar to the configuration process in section 3.1 (above).
One or both of the following options may be independently added to the “mc_conf.dat” file to trigger
calibration of airspeed and altitude respectively:
CALIBRATE_AIRSPEED
CALIBRATE_ALTITUDE
If calibrating airspeed, the external tester must be connected to the pitot port of the MD302, with the test
pressure stabilized at 120 knots.
If calibrating altitude, the external tester must be connected to the static port of the MD302, with the test
pressure stabilized at 5,000 feet.
Both calibrations may be done at the same time with a combined P/S tester.
The procedure is:
1. Power off MD302.
2. Uncover the USB port and insert flash drive containing the configuration file.
3. Power on MD302.
4. The STATUS indicator will blink green while calibration is processed.
5. The RESULT indicator will illuminate green if the calibration is successful.
6. Remove the USB stick while power remains on.
7. The MD302 will reboot and illuminate STATUS green to indicate normal operation with the
new calibration.
8. Reinstall USB cover.
If the RESULT indicator is not green following Step 5, the calibration was not completed. This could be
due to a misspelled entry, improper syntax or improper test pressure.
IMPORTANT: AFTER CALIBRATING PRESSURE, THE AIRSPEED AND ALTITUDE
FUNCTIONS MUST BE TESTED FOR THE REQUIRED TOLERANCES ACROSS THE
OPERATING RANGE OF THE AIRCRAFT.
