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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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08/12/19

Message Overview:

Fault Message:

WHEEL SPEED XDCR OUTBD L/BCU/WRG

Fault Code:

3245414HA

Associated CAS:

BRAKE 50% DEGRADED
(Caution)

L OUTBD BRAKE FAIL
(Caution)

BRAKE FAULT
(Advisory)

Reporting LRU: Brake Control Unit (BCU)
System Description: 32-43-00
Schematic Diagram: 32-43-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 32-11-01 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Fault Description:

Left Outboard Wheel Speed Transducer has been detected failed by the Brake Control Unit (BCU).

Possible Causes:

  • Left Outboard Wheel Speed Transducer (WST) (P17)
  • Brake Control Unit (BCU) (A71)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin:

  • AW700-32-0138 - Loss of Normal Braking Upon Landing
  • AW700-32-0244 - Operational Procedures to Prevent Freezing Brakes
  • AW700-32-0513 - Wheel Speed Transducer - Brake System Nuisance Fault Messages
  • AW700-32-0359 - Brake Control System - Data Gathering to Reduce the Brake Control Unit (BCU) No-Fault-Found (NFF) rate
  • AW700-32-0573 - Main Landing Gear Trailing Arm Water Ingress Survey
  • SB 700-32-016 - MODIFICATION - BRAKE CONTROL SYSTEM - PART NO. CHANGE OF THE BRAKE CONTROL UNIT TO GW415-7125-5

Forum Articles/Infoservice/Newsletter: None

NOTE: Download and complete this Water Ingress Survey Form when complying with AW700-32-0573.

Brake Control System (BCS) NFF Action:

To support the technical investigation, FSRs and Service Centers are requested to perform an NVM download, complete a condition report and fill out this BCS questionnaire when troubleshooting or removing a Brake component.

Quick Links:

Removal of the Brake Control Unit AMM 32-43-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Brake Control Unit AMM 32-43-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Wheel Speed Transducer AMM 32-43-53-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Wheel Speed Transducer AMM 32-43-53-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Functional Test of the Wheel Speed Transducer AMM 32-43-53-720-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Access to System Diagnostics AMM 45-45-00-970-804 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. Re-seat the BCU. Is the fault still present?

    1. If NO, do close out.
    2. If YES, continue with next step.

  2. Perform the Wheel Speed Transducer - Adjustment/Test. Is the fault still present?

    1. If NO, do close out.
    2. If YES, continue with next step.

  3. Disconnect the Left Outboard WST connector (P17). Perform a resistance check as follows:

    For P/N: 27700-103

    From To Expected Result Result
    P17-1 P17-2 Must not exceed 700 Ω
    P17-3 P17-4 Must not exceed 700 Ω

    For P/N: 27700-105

    From To Expected Result Result
    P17-1 P17-2 650 ± 50 Ω
    P17-3 P17-4 650 ± 50 Ω

    For P/N: 27700-107

    From To Expected Result Result
    P17-1 P17-2 655 ± 35 Ω
    P17-3 P17-4 655 ± 35 Ω

    For P/N: 27700-109

    From To Expected Result Result
    P17-1 P17-2 620 ± 55 Ω
    P17-3 P17-4 620 ± 55 Ω

    NOTE: The resistance check must be performed at 70±5 °F(21±3 °C). If the temperature is not included in that range, perform the correction of the measurement to 70 °F(21 °C) with the formulas that follow:
    -Resistance value at 70 °F=R1 × [(460.1)/(T1 + 390.1)]
    -Resistance value at 21 °C=R1 × [(255.5)/(T1 + 234.5)]
    -T1=Temperature at which it is measured
    -R1=Resistance measured at temperature T1

    1. If resistance values are not within tolerance, replace WST and do close out.
    2. If resistance values are within tolerance, continue with next step.

  4. Swap the Left outboard WST with Right outboard WST. Is the fault still present?

    1. If NO, replace Left outboard WST and do close out.
    2. If YES, continue with next step.

  5. Perform wiring checks between the Left outboard WST (P17) and the BCU (A71AP1 and A71BP1).

    1. If wiring checks are not good, repair defective wiring as required and do close out.
    2. If wiring checks are good, continue with next step.

  6. Replace BCU.
  7. Do close out.

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