07/11/19
Message Overview:
Fault Message:
HST POS XDCR #2/ACT/WRG FAULT
Fault Code:
27662312SX
Associated CAS:
| Reporting LRU: | Flight Control Unit (FCU) |
| System Description: | 27-40-00 |
| Schematic Diagram: | 27-41-00 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Wiring Diagram: | 27-41-02 [ Global Express ] [ G5000 ] [ Global XRS ] 27-41-03 [ Global Express ] [ G5000 ] [ Global XRS ] |
Fault Description:
There is a mismatch error greater than 0.2 degrees for at least 1 second between the two Pitch Trim Actuator Position Transducers.
Possible Causes:
- Pitch-Trim Actuator (B44)
- Flight Control Unit (FCU) 1 (A65)
- Flight Control Unit (FCU) 2 (A66)
- Associated Wiring
Troubleshooting Tips:
Advisory Wire/Service Bulletin: None
Forum Articles/Infoservice/Newsletter: None
This fault may sometime be cleared by performing the flight control systems reset procedure. If the message comes back more then once within 10 flight legs, replace the MDU.
The Pitch Trim position transducer can not be replaced on the pitch trim actuator.
The HST position XDCR status can be verified by accessing the CAIMS system diagnostic:
- SYSTEM DIAG
- 27-00 FLIGHT CONTROLS
- FLIGHT CONTROL UNIT #1(2)
- LRU TEST
- DISPLAY ADVANCED EFCS DATA
- Go to page 4 of 8
The HST position XDCR #1 status can be found on CAIMS System Diagnostic:
- SYSTEM DIAG
- 27-00 FLIGHT CONTROLS
- FLIGHT CONTROL UNIT #1(2)
- LRU TEST
- DISPLAY HORIZ STAB DATA
Quick Links:
| Removal of the Pitch Trim Actuator | AMM 27-41-09-000-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Installation of the Pitch Trim Actuator | AMM 27-41-09-400-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Removal of the Flight-Control Units | AMM 27-61-05-000-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Installation of the Flight-Control Units | AMM 27-61-05-400-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Access to System Diagnostics | AMM 45-45-00-970-804 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Wire Repair - Maintenance Practices - ALL | SPM 20-12-10-02 [ Global Express ] [ G5000 ] [ Global XRS ] |
Troubleshooting Recommendations:
- Swap FCUs.
- If system checks are good, replace defective FCU. Reset FCUs latched faults and do close out.
- If fault remains, continue with next step.
- Replace Pitch Trim Actuator
- If system checks are good, do close out.
- If fault remains, continue with next step.
- From the CAIMS page "DISPLAY HORIZ STAB DATA", make sure that there are no values shown in red for the HST XDCR 2.
- Make sure that both HST XDCRs data are within ±0.2 degrees
- If there are no values (or random values) displayed for the HST XDCR 2, perform wiring checks between HST XDCR 2 and FCUs.
- If wiring checks are not good, repair defective wiring as required and do close out.
- If wiring checks are good, continue with next step.
- Check for the tolerance between two readings greater than ±0.2 degrees.
- If YES, continue with next step.
- If NO, do close out.
- Replace the Pitch Trim Actuator.
- Do close out.