Air Data Troubleshooting - Garmin G3X Installation Manual

10.3 Air Data Troubleshooting

Under normal operating conditions, the GSU 73 provides the following air data information:
•
Total Air Temperature is measured
•
Outside Air Temperature (OAT)
•
Indicated Airspeed (IAS)
•
True Airspeed (TAS)
•
Barometric Altitude
•
Density Altitude
•
Pressure Altitude
•
Static Pressure
•
Differential Pressure
TAS information can only be displayed at speeds greater than 20 Knots (TAS is invalid
when the aircraft is sitting still, or if no OAT probe is connected).
If the TAS indication remains dashed out at speeds greater than 20 knots and/or the OAT indication is
dashed out (as shown in Figure 10-1):
1. Check the GTP 59 OAT probe wiring and connection for faults.
2. Check GSU 73 configuration module wiring for damage, replace if any is found.
3. Replace the GTP 59 OAT probe.
4. If the problem persists, replace the GSU 73 with a known good unit.
If the Airspeed and/or Altitude is failed and shows a Red-X condition as shown in Figure 10-2:
Figure 10-2 – Airspeed and Altitude Failure Indications
G3X Installation Manual - Troubleshooting
190-01115-01
NOTE
Figure 10-1 – No info for TAS & OAT
Page 10-3
Revision E