G900X/G950 Installation and Maintenance Manual – Troubleshooting
Page D-57
190-00719-00
Revision D
D.9.4 Software Installation
Before beginning the software field upgrade procedure, the GDC 74(X) Field Calibration utility must be
downloaded from the Garmin website.
1.
Enter the Dealer Resource portion of the Garmin website (www.garmin.com).
2.
From the Technical Resource list, click on the link for the GDC 74(X) Field Calibration utility.
3.
Follow the instructions to save the file to the PC (it is recommended to create a folder
‘C:\Garmin’ as a target directory for the file).
D.9.5 Procedure
1.
Connect GDC 74A to the pressure control system.
2.
Connect the GDC 74A to the PC serial port using the GDC 74A – PC Interface Cable (Figure
D-3).
3.
Connect the GDC 74A - PC Interface Cable to the power supply (Figure D-3).
4.
Power on the GDC 74A and the pressure control system.
5.
Set the pressure control system to a pressure altitude of 40,000 feet and determine that leakage is
less than 140 feet per minute.
6.
Run GDC_FieldCal.exe.
7.
Click on ‘Begin Field Calibration’ (Figure D-4).
NOTE
The GDC 74(X) Field Calibration utility requires that the GDC 74A and the pressure
control system be powered on for a minimum of 20 minutes before calibration.
Figure D-4. GDC 74A Field Calibration Utility, Main Page
