Adahrs Static Pressure Calibration - Garmin G3X Touch Installation Manual

33.4.3.4

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. Enter configuration mode by holding down the left-hand softkey while powering on the PFD 1
display (if needed).
2. Use the FMS Joystick to select the ADAHRS Page (if needed).
3. Use the FMS Joystick to select which ADAHRS (1, 2, or 3) is being configured.
190-01115-01 G3X/G3X Touch Installation Manual - GDU 37X Config and Post Install Checkout
Rev. AC Page 33-20