04/16/21
Message Overview:
| DDG Reference: | None |
| Pilot Action (QRH): | AVNC 02-2 |
| 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 ] |
Message Description:
The data from MADC 1 system does not agree with the other two MADCs (this is an external fault or probe fault).
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
Notice To Operators (NTO): None
Flight Operation Notifications Manual (FONM): None
Quick Links:
| Functional Test of the Air Data Computer System | 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 ] |
| 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 ] |
| 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 ] |
| Access to System Diagnostics | AMM 45-45-00-970-804 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Integrated Maintenance Test (IMT) Fault Code Look-up | AMM 45-45-00-970-826 [ Global Express ] [ G5000 ] [ Global XRS ] |
Troubleshooting Recommendations:
- Using the PMAT, access CAIMS, System Diagnostics, ATA 34, Air Data Computer and perform a test of the associated ADC. If the test fails, an IMT failure code will be displayed. Record the code (AMM 45-45-00-970-804 - Access to System Diagnostics).
- In the PMAT Start Menu, select AIRCRAFT DIAGNOSTIC and click on IMT FAILURE CODE LOOKUP to launch the tool (AMM 45-45-00-970-826 - Integrated Maintenance Test (IMT) Fault Code Look-up).
- Select the recorded code from the dropdown menu and perform the troubleshooting steps displayed on the page.
- If the fault is isolated and resolved, do close out.
- If no code was present or the fault persists, continue with next step.
- 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 1 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.
