12/20/24
Message Overview:
Message Name:
R OB WHEEL SPEED XDCR
Message Code:
B3-007835
Associated CAS:
| Reporting LRU: | R OB WHEEL SP |
| System Description: | 27-51-00 - Flap Control System 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: | 27-61-07 - Sheet 1 - Spoiler Electronic-Control Unit (SCU) No. 2 - 20501 TO 20806 27-61-07 - Sheet 2 - Spoiler Electronic-Control Unit (SCU) No. 2 - 20501 TO 20806 27-61-07 - Sheet 3 - Spoiler Electronic-Control Unit (SCU) No. 2 - 20501 TO 20806 27-61-07 - Sheet 1 - Spoiler Electronic-Control Unit (SCU) No. 2 - 20807 TO 20829 27-61-07 - Sheet 1 - Spoiler Electronic-Control Unit (SCU) No. 2 - 20830 TO 20874 27-61-07 - Sheet 1 - Spoiler Electronic-Control Unit (SCU) No. 2 - 20875 TO 20936 27-61-07 - Sheet 2 - Spoiler Electronic-Control Unit (SCU) No. 2 - 20875 TO 20936 27-61-07 - Sheet 1 - Spoiler Electronic-Control Unit (SCU) No. 2 - 20937 AND SUBS 27-61-07 - Sheet 2 - Spoiler Electronic-Control Unit (SCU) No. 2 - 20937 AND SUBS 32-43-25 - Sheet 1 - Brake Shutoff Valves - ALL 32-43-49 - Sheet 1 - Wheel Speed Transducers - ALL |
Message Description:
Right Outboard Wheel Speed Sensor fault detected by the Spoiler Electronic Control Unit 2 (SECU2).
Possible Causes:
- Right Outboard Wheel Speed Transducer (MT92)
- Spoiler Electronic-Control Unit 2 (SECU 2) (A119)
- 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 OUTBD 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 Outboard Wheel Speed Transducer / BCU.
- Perform wiring checks from BCU connector A67P1 to SECU 2 connector A119AP1.
- If wiring defects are found, repair defective wiring as required.
- If wiring checks are good, continue with next step.
- Visually inspect SECU's and tray's connectors for damages.
- If defects are found, rectify as required.
- If no defects are found, continue with next step
- Interchange SECU 2 with SECU 1. 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 swapping or SECU replacement.
- Replace the Brake Control Unit.
- Do close out.