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(WARNING)
RED MESSAGE (CAUTION)
AMBER MESSAGE (ADVISORY)
CYAN MESSAGE (STATUS)
WHITE MESSAGE Require immediate crew attention. These messages are accompanied by flashing master warning, triple chime attenson with or without voice message or dedicated tone. Require immediate crew awareness and future crew action may be required in the form of alternate system selection or performance limitation. These message are accompanied by flashing master caution and a single chime. Indicate safe or normal system operation which require crew awareness, over and above the dark cockpit philosophy. Indicate minor failures or reduction in systems capability, which require no crew action.

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03/10/21

Message Overview:

Message Name:

L OB WHEEL SPEED XDCR

Message Code:

B3-007111

Associated CAS:

L OUTBD BRAKE FAIL
(Caution)

Reporting LRU: LOB WHL SPD XDCR
System Description: 32-43-00
Schematic Diagram: 32-43-00
Wiring Diagram: 32-43-49

Message Description:

Left outboard Wheel Speed Transducer fault detected by the Brake Control Unit.

NOTE: The failure of the Left Outboard Wheel Speed Transducer may cause a cyan 'SPOILER FAULT' advisory CAS message to be shown and the associated MDC B3-007112 code.

Possible Causes:

  • Left Outboard Wheel Speed Transducer (MT89)
  • Brake Control Unit (BCU) (A67)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

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
Data Download from the Maintenance Diagnostic Computer (MDC) AMM 45-45-01-970-802
Standard Practices - Replace Wiring SPM 20-12-00-02
Wiring - Maintenance Practices - ALL SPM 20-12-00-02
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02
Electrical Connectors - Maintenance Practice - ALL SPM 20-20-00-02
Standard Practices - Connector Integrity After a Disconnect
and Re-Connection		 SPM 20-20-00-02

Troubleshooting Recommendations:

  1. Access the MDC 'LRU TEST' page.
  2. Carry out the outboard BCU 'WHEEL SPEED XDCR TEST'.

    1. If the LEFT WHEEL SPEED TRANSDUCER RESISTANCE TEST fails, go to next step.
    2. If the test passed, do close out.

  3. Pull LCBP-C15 (OUTBD BRAKES), LCBP-C14 (WOW B), RCBP-C13 (WOW B/EXT).
  4. Disconnect wheel well connector P509 (4).
  5. Do a resistance check between pins 1 and 2 of connector P509. The resistance-to-temperature reading must be within the limits shown on Figure 1001.

    1. If resistance is not within limits, do the following:

      1. Remove right outboard wheel speed transducer.
      2. Do a resistance check between pins A and B of the wheel speed transducer. The resistance-to-temperature reading must be within the limits shown on Figure 1001.

        1. If resistance is not within limits, replace wheel speed transducer.
        2. If resistance is within limits, repair wiring between P509 and wheel speed transducer.

    2. If resistance is within limits, go to next step.

  6. Replace BCU.

350_32-43-00_resistance350_32-43-00_gear

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