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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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10/07/24

Message Overview:

OUTBD BRK LO PRESS
(Caution)

DDG Reference: None
Pilot Action (QRH): GEAR 10-09
System Description: 32-42-00 - Nose Wheels and Tires
32-43-00 - Brake Control System
Schematic Diagram: [ G5000 ]  [ Global Express ]  [ Global XRS ] SSM 32-43-00-101 - Brake Control System - Electrical Schematic
Wiring Diagram: [ G5000 ]  [ Global Express ]  [ Global XRS ] WM 32-43-00-3_004 - Sheet 4 - Indication - [9002]
[ G5000 ]  [ Global Express ]  [ Global XRS ] WM 32-43-04-1_001 - Sheet 1 - Indication - ALL

Message Description:

The Outboard Brake Pressure is detected being < 1400 PSI by the Outboard Brake Pressure Switch (system 2).

Possible Causes:

  • Hydraulic System 2 Pressure is < 1400 PSI
  • System (SYS) 2 Brake Pressure Switch (S7)
  • Brake Control Unit (BCU) (A71)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin:

  • AW700-32-0359 - Brake Control System - Data Gathering to Reduce the Brake Control Unit (BCU) No-Fault-Found (NFF) rate
  • AW700-32-0513 - Wheel Speed Transducer - Brake System Nuisance Fault Messages
  • SB700-31-020 - MODIFICATION - FLIGHT DATA RECORDING (FDR) SYSTEM - INSTALLATION OF THE FORCE TRANSDUCER UNITS (FTU) AND ACTIVATION OF THE CREW FORCE MEASURING SYSTEM (CFMS) 2002

Full Throttle Blog/Forum Articles/Infoservice/Newsletter: None

Flight Operation Notifications Manual (FONM): None

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 a BCS questionnaire when troubleshooting or removing a Brake component.

NOTES:

  • To avoid unnecessary replacement of BCS part due to Brake related CAS nuisance message, before troubleshooting, follow AW700-32-0513 instructions

    • Proceed to a QAR (if available) download of the last three flights (Aircraft meeting FAR part 135.172.), SB700-31-020
    • BCU NVM download
    • IAC CAS messages download

Quick Links:

Grounding of the Aircraft [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM10-11-00-867-801
Removal of the Covers and Plugs [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM10-12-00-020-801
Installation of the Covers and Plugs [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM10-12-00-420-801
Standard Aircraft Configuration for Maintenance [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM12-00-00-867-801
Aircraft Walkaround (for Maintenance) [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM12-00-00-867-802
Connect Electrical Power to the Aircraft [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM24-00-00-861-801
Remove the Electrical Power from the Aircraft [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM24-00-00-861-802
Electrical/Electronic Safety Precautions [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM24-00-00-910-801
Electrostatic Discharge Safety Precautions [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM24-00-00-910-802
Operational Test of the Brake System [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM32-43-00-710-801
Operational Test of the No. 3 Hydraulic-System Brake Pressure-Switch [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM32-43-00-710-802
Removal of the Brake Control Unit [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM32-43-01-000-801
Installation of the Brake Control Unit [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM32-43-01-400-801
Removal of the No. 2 Hydraulic-System Brake Pressure-Switch [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM32-43-49-000-801
Installation of the No. 2 Hydraulic-System Brake Pressure-Switch [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM32-43-49-400-801
Removal of the No. 3 Hydraulic-System Brake Pressure-Switch [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM32-43-51-000-801
Installation of the No. 3 Hydraulic-System Brake Pressure-Switch [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM32-43-51-400-801
Access to Active Faults [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM45-45-00-970-802
Access to Stored Faults [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM45-45-00-970-803
Access to System Diagnostics [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM45-45-00-970-804
Flight Deck Effect to Fault Correlations [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM45-45-00-970-821
Wire Repair - Maintenance Practices - ALL [ G5000 ]  [ Global Express ]  [ Global XRS ] SPM20-12-10-02

Troubleshooting Recommendations:

  1. Using CAIMS, Access BRAKE CONTROL SYSTEM DATA PAGES under ATA 32 "BCU".
  2. Pressurize the hydraulic system 2.
  3. Confirm on the EICAS that 3000 PSI is present on Hydraulic System 2.
  4. If 3000 PSI is not present, troubleshoot the Hydraulic System.
  5. Under the SYSTEM DATA PAGES, monitor the "Inlet Pressure Switch" position. Make sure that "PRESSURE" is shown for both channels of the System 2 Pressure Switch.

    1. If pressure is shown, do close out.
    2. If pressure is not shown, continue with next step.

  6. Interchange Inboard and Outboard Pressure Switches. Is the fault still present on the same side?

    1. If YES, continue with next step.
    2. If NO, replace defective pressure switch.

  7. Perform a wiring check between the BCU and the OUTBOARD Pressure Switch.

    1. If defects are found, repair defective wiring as required.
    2. If wiring checks are good, continue with next step.

  8. Replace the BCU.
  9. Do close out.

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