01/10/25
Message Overview:
Message Name:
R IB WHEEL SPEED XDCR
Message Code:
B3-007779
Associated CAS:
| Reporting LRU: | R IB WHEEL SP |
| System Description: | 27-61-00 - Control and Indication System Spoiler 27-62-00 - Multi-Function Spoiler 27-63-00 - Ground-Spoiler |
| Schematic Diagram: | 27-61-00 - Flight Spoiler Control and Indication System 27-62-00 - Multi-Function Spoiler 27-63-00 - Ground-Spoiler |
| Wiring Diagram: | 27-61-05 - Sheet 1 - Spoiler Electronic-Control Unit (SCU) No. 1 - 20501 TO 20806 27-61-05 - Sheet 2 - Spoiler Electronic-Control Unit (SCU) No. 1 - 20501 TO 20806 27-61-05 - Sheet 3 - Spoiler Electronic-Control Unit (SCU) No. 1 - 20501 TO 20806 27-61-05 - Sheet 1 - Spoiler Electronic-Control Unit (SCU) No. 1 - 20807 TO 20829 27-61-05 - Sheet 1 - Spoiler Electronic-Control Unit (SCU) No. 1 - 20830 TO 20874 27-61-05 - Sheet 1 - Spoiler Electronic-Control Unit (SCU) No. 1 - 20875 TO 20936 27-61-05 - Sheet 2 - Spoiler Electronic-Control Unit (SCU) No. 1 - 20875 TO 20936 27-61-05 - Sheet 1 - Spoiler Electronic-Control Unit (SCU) No. 1 - 20937 AND SUBS 27-61-05 - Sheet 2 - Spoiler Electronic-Control Unit (SCU) No. 1 - 20937 AND SUBS 32-43-25 - Sheet 1 - Brake Shutoff Valves - ALL 32-43-49 - Sheet 1 - Wheel Speed Transducers - ALL |
Message Description:
Right Inboard Wheel Speed Sensor fault detected by the Spoiler Electronic Control Unit 1 (SECU1).
Possible Causes:
- Right Inboard Wheel Speed Transducer (MT90)
- Spoiler Electronic Control Unit 1 (SECU 1) (A118)
- Brake Control Unit (BCU) (A67)
- Associated Wiring
Troubleshooting Tips:
Advisory Wire/Service Bulletin: None
Full Throttle Blog/Forum Articles/Infoservice/Newsletter: None
Flight Operation Notifications Manual (FONM): None
Quick Links:
| Removal of the Spoiler Electronic-Control Unit (SECU) | AMM 27-61-05-000-801 |
| Installation of the Spoiler Electronic-Control Unit (SECU) | AMM 27-61-05-400-801 |
| Electronic Rigging of the Spoiler Electronic-Control Unit (SECU) | AMM 27-61-05-820-801 |
| Electronic Rigging of the Spoiler Electronic-Control Unit (SECU) | AMM 27-61-05-820-802 |
| Removal of the Brake Control Unit | AMM 32-43-01-000-801 |
| Installation of the Brake Control Unit | AMM 32-43-01-400-801 |
| Removal of the Wheel Speed Transducer | AMM 32-43-49-000-801 |
| Installation of the Wheel Speed Transducer | AMM 32-43-49-400-801 |
| Operational Test of the Wheel Speed Transducer | AMM 32-43-49-710-801 |
Troubleshooting Recommendations:
- Verify if the EICAS 'SPOILER FAULT' is posted with an 'R INBD BRAKE FAIL' CAS message:
- If YES, continue with next step.
- If NO, go to step 3.
- Check the current faults and fault history for problems related to the Right Inboard Wheel Speed Transducer / BCU.
- If one of the listed fault is found, continue with the troubleshooting of this failure.
- If none of the listed faults is recorded in the MDC, continue with next step.
- Perform wiring checks from BCU connector A67P2 to SECU connector A118AP1.
- If system checks are good, do close out.
- If fault remains, continue with next step.
- Visually inspect SECU's and tray's connectors for damages. Repair/replace as required.
- If system checks are good, do close out.
- If fault remains, continue with next step.
- Interchange SECU 1 with SECU 2. Is the fault still present?
- If YES, continue with next step.
- If NO, replace defective SECU.
NOTE: An Electronic Rigging of the SECUs is necessary after a swap or a SECU replacement.
- Replace the Brake Control Unit.
- Do close out.