07/10/19
Message Overview:
Fault Message:
H STAB MOT DR UNIT [CH1]/WRG FAULT
Fault Code:
27661261SX
Associated CAS Message:
| Reporting LRU: | Flight Control Unit (FCU) 1 |
| System Description: | 27-40-00 |
| Schematic Diagram: | 27-41-00 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Wiring Diagram: | 27-41-04 [ Global Express ] [ G5000 ] [ Global XRS ] |
Fault Description:
There is a Horizontal Motor Drive Unit failure or the interface wiring is defective between the Flight Control Unit (FCU) 1 and the Motor Drive Unit (MDU).
Possible Causes:
- Pitch Trim Actuator Motor Drive Unit (MDU) (A184)
- Flight Control Unit (FCU) 1 (A65)
- Pitch Trim Actuator (B44)
- 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 system reset procedure. If the message comes back more then once within 10 flight legs, troubleshooting is required.
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 Pitch-Trim Actuator-Motor Drive-Unit | AMM 27-41-17-000-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Installation of the Pitch-Trim Actuator-Motor Drive-Unit | AMM 27-41-17-400-801 [ 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 ] |
| Wire Repair - Maintenance Practices - ALL | SPM 20-12-10-02 [ Global Express ] [ G5000 ] [ Global XRS ] |
Troubleshooting Recommendations:
- Swap FCU 1 with FCU 2 and check for the failure transfer over to Channel 2?
- If YES, replace FCU 1. Reset FCUs latched faults and do close out.
- If NO, continue with next step.
- Use Ground Support Equipment 27X-41-09 'MDU INVERTING HARNESS' if available. Confirm the failure with the inverting harness installed.
- If the fault is now on channel 2, it means that the MDU CH 1 is defective. Replace the MDU and do close out.
- If the fault remains on channel 1, the failure could be with the HSTA motor or the wiring interface. Continue with next step.
- Disconnect FCU 1 connector A65DP1 and A65BP1. Disconnect MDU connector A184P3. Perform a continuity check as follows:
From To Result A65DP1-3H A184P3-37 A65DP1-3J A184P3-23 A65DP1-6G A184P3-6 A65DP1-5K A184P3-7 A65DP1-5J A184P3-8 A65DP1-3G A184P3-24 A65BP1-14F A184P3-28 A65BP1-14E A184P3-29 A65BP1-15F A184P3-16 A65BP1-15E A184P3-17 - If there is no continuity, repair defective wiring as required and do close out.
- If there is continuity, continue with next step.
- Disconnect MDU connectors A184P2 and A184P3. Disconnect Pitch Trim Actuator connectors B44P1 and B44P2. Perform a continuity check as follows:
From To Result A184P2-A B44P1-A A184P2-B B44P1-B A184P2-C B44P1-C A184P3-20 B44P2-13 A184P3-19 B44P2-14 A184P3-3 B44P2-12 A184P3-4 B44P2-11 A184P3-2 B44P2-26 A184P3-1 B44P2-34 A184P3-10 B44P2-32 A184P3-25 B44P2-33 - If there is no continuity, repair defective wiring as required and do close out.
- If there is continuity, continue with next step.
- Replace the Pitch Trim Actuator.
- Do close out.
