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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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03/16/21

Message Overview:

Message Name:

R IB WHEEL SPEED XDCR

Message Code:

B3-007778

Associated CAS:

R INBD BRAKE FAIL
(Caution)

Reporting LRU: RIB WHL SPD XDCR
System Description: 32-43-00
Schematic Diagram: 32-43-00
Wiring Diagram: 32-43-09

Message Description:

Right Inboard Wheel Speed Transducer fault detected by the Brake Control Unit.

NOTE: The failure of the Right Inboard Wheel Speed Transducer may cause a cyan 'SPOILER FAULT' advisory CAS message to be shown and the associated MDC B3-007779 code.

Possible Causes:

  • Right Inboard Wheel Speed Transducer (MT90)
  • 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 Brake Control Valve AMM 32-43-09-000-801
Installation of the Brake Control Valve AMM 32-43-09-400-801
Data Download from the Maintenance Diagnostic Computer (MDC) AMM 45-45-01-970-802
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Electrical Wiring - Continuity Test -
Adjustment/Test		 SPM 20-12-01-05
Standard Practices - Wire Repair SPM 20-12-10-02

Troubleshooting Recommendations:

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

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

  3. Pull LCBP-C15 (INBD BRAKES), LCBP-C13 (WOW A/RET/EXT), RCBP-C14 (WOW A/RET).
  4. Disconnect wheel well connector P514 (5).
  5. Do a resistance check between pins 1 and 2 of connector P514. 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 inboard 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 P514 and wheel speed transducer.

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

  6. Replace BCU.
  7. Do close out.

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

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