Garmin G3X Installation Manual page 622

32.4.5.7 Calibration Procedure F: ADAHRS Static Pressure Calibration
The ADAHRS Calibration page (configuration mode) has a selection for ADAHRS Static Pressure
Calibration. This procedure is used to perform an altimeter re-calibration. The altitude pressure sensor
used in any G3X ADAHRS unit is very low drift and does not typically require re-calibration.
NOTE
This calibration is only used when an ADAHRS fails a periodic altimeter test and should
only rarely, if ever, be used.
The static pressure calibration requires the use of a pressure control system (test set) with an altitude
accuracy of at least +/- 5 ft at sea level and +/- 20 ft at 30,000 ft. It is necessary to re-calibrate to sea level
(0 ft), 10,000 ft, 20,000 ft, and optionally to 30,000 ft. The operator is allowed to finish the calibration at
the end of the 20,000 ft calibration if the 30,000 ft calibration is not desired.
CAUTION
To avoid damaging the ADAHRS pressure sensors, the pitot, AOA (for GSU 25),
and static ports must be connected to the test set.
It is acceptable to connect multiple pneumatic ports together. The AOA port should typically be connected
to the static port such that it is always exposed to the same pressure as the static port during the test.
CAUTION
Leaving the AOA port disconnected and exposed to ambient pressure during the
static pressure re-calibration will damage the AOA sensor.
1. Power on PFD1 in configuration mode
in configuration mode.
2. Use the Touch Panel or a Move Selector Knob to select the ADAHRS Calibration Page.
3. Use the Touch Panel or a Move Selector Knob to select the ADAHRS (1, 2 or 3) that is being
configured.
4. Use the Touch Panel or a Move Selector Knob to select Static Pressure Calibration.
190-01115-01 G3X/G3X Touch Install Manual - GDU 45X/46X Config and Post Install Checkout
Rev. AA
(Section 32.2), this step can be skipped if PFD1 is already
Page 32-27