12/11/19
Message Overview:
| DDG Reference: | None |
| Pilot Action (QRH): | AVNC 02-3 |
| System Description: | 34-11-00 |
| Schematic Diagram: | 34-11-00 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Wiring Diagram: | 34-11-01 [ Global Express ] [ G5000 ] [ Global XRS ] |
Fault Description:
The data from the three MADCs do not agree. (This is an external fault or probe fault that causes the autopilot and yaw damper to automatically disengage).
Possible Causes:
- Air Data System is not calibrated correctly
- Pitot-Static System has a leak
- Temperature Probe
- Pitot-Static Probe
- Probe Heaters
Troubleshooting Tips:
Advisory Wire/Service Bulletin: None
Forum Articles/Infoservice/Newsletter:
- Forum - Volume 11, Issue 07 (April 8, 2014) - ALL ADC MISCOMP CAS Message (ATA 34-11)
- Forum - Volume 14, Issue 01 (January 10, 2017) - Pitot Probe Cover
- Forum - Volume 16, Issue 12 (June 12, 2019) - Pitot-static probes cover will prevent contamination and damage
Quick Links:
| Functional Test of the Air Data Computer, (RVSM Qualified A/C) | AMM 34-11-00-720-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Functional Test of the Pitot-Static Systems | AMM 34-11-00-720-802 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Leak Test of the Pitot-Static System 1 | AMM 34-11-00-790-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Leak Test of the Pitot-Static System 2 | AMM 34-11-00-790-802 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Leak Test of the Pitot-Static System 3 | AMM 34-11-00-790-803 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Leak Test of the Standby Pitot-Static System | AMM 34-11-00-790-804 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Detailed Inspection of the Pitot-Static Probes | AMM 34-11-01-220-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Pitot Line P1 Contamination Removal | AMM 34-11-01-100-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Pitot Line P2 Contamination Removal | AMM 34-11-01-100-802 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Pitot Line P3 Contamination Removal | AMM 34-11-01-100-803 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Pitot Line P STBY Contamination Removal | AMM 34-11-01-100-804 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Static Line P1 S1/P STBY S2 Contamination Removal | AMM 34-11-01-100-805 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Static Line P2 S1/P3 S2 Contamination Removal | AMM 34-11-01-100-806 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Static Line P3 S1/P2 S2 Contamination Removal | AMM 34-11-01-100-807 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Static Line P STBY S1/P1 S2 Contamination Removal | AMM 34-11-01-100-808 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Cleaning of the Pitot-Static Probes | AMM 34-11-01-160-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Servicing of the Visual Drains | AMM 34-11-03-616-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
Troubleshooting Recommendations:
- Do the procedures that follow until the fault of the ADC system is isolated:
- Functional test of the ADC system.
- Detailed inspection of the pitot-static probes.
- All Pitot system contamination removal tasks (see Quick Links: section above)
NOTE: This step should be performed, regardless if contamination is found in the moisture traps. - Functional test of the pitot-static systems.
- Leak test of the pitot-static system 1.
- Leak test of the pitot-static system 2.
- Leak test of the pitot-static system 3.
- Do close out.