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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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10/08/24

Message Overview:

UNCOMMANDED BRAKE
(Caution)

DDG Reference: None
Pilot Action (QRH): GEAR 10-12
System Description: 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_001 - Sheet 1 - Left Hand Side - [9002]
[ G5000 ]  [ Global Express ]  [ Global XRS ] WM 32-43-00-3_002 - Sheet 2 - Right Hand Side - [9002]
[ G5000 ]  [ Global Express ]  [ Global XRS ] WM 32-43-00-3_003 - Sheet 3 - Control - [9002]
[ G5000 ]  [ Global Express ]  [ Global XRS ] WM 32-43-00-3_004 - Sheet 4 - Indication - [9002]
[ G5000 ]  [ Global Express ]  [ Global XRS ] WM 32-43-00-3_005 - Sheet 5 - Pedal Position - [9002]
[ G5000 ]  [ Global Express ]  [ Global XRS ] WM 32-43-01-1_001 - Sheet 1 - Left - ALL
[ G5000 ]  [ Global Express ]  [ Global XRS ] WM 32-43-02-1_001 - Sheet 1 - Right - ALL
[ G5000 ]  [ Global Express ]  [ Global XRS ] WM 32-43-03-1_001 - Sheet 1 - Control - ALL
[ G5000 ]  [ Global Express ]  [ Global XRS ] WM 32-43-04-1_001 - Sheet 1 - Indication - ALL
[ G5000 ]  [ Global Express ]  [ Global XRS ] WM 32-43-05-1_001 - Sheet 1 - Pedal Position - ALL

Message Description:

An Uncommanded Brake condition is reported by the Brake Control Unit (BCU) on Label 270 if any of the following condition is met:

  • Left Outboard Brake Pressure > commanded
  • Left Inboard Brake Pressure > commanded
  • Right Outboard Brake Pressure > commanded
  • Right Inboard Brake Pressure > commanded

Possible Causes:

  • Mechanical fault
  • Left Outboard Brake Control Valve (BCV) (MT53)
  • Right Outboard Brake Control Valve (BCV) (MT56)
  • Left Inboard Brake Control Valve (BCV) (MT153)
  • Right Inboard Brake Control Valve (BCV) (MT169)
  • Inboard Brake Shut-Off Valve (SOV) (L13)
  • Outboard Brake Shut-Off Valve (SOV) (L14)
  • Pilot Left Brake Pedal Position Transducer (MT57)
  • Pilot Right Brake Pedal Position Transducer (MT58)
  • Copilot Left Brake Pedal Position Transducer (MT59)
  • Copilot Right Brake Pedal Position Transducer (MT60)
  • Brake Control Unit (BCU) (A71)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin:

  • AW700-32-0244 - Operational Procedures to Prevent Freezing Brakes
  • 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

NOTES:

  • If you replace a brake system component please fill out this questionnaire.
  • SB700-31-020 - Proceed to a QAR (if available) download of the last three flights (Aircraft meeting FAR part 135.172)
  • 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 Data Acquisition System [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM31-42-00-710-801
Removal of the Data Acquisition Units (DAU) [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM31-42-01-000-801
Installation of the Data Acquisition Units (DAU) [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM31-42-01-400-801
Operational Test of the Brake System [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM32-43-00-710-801
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 Brake-Pedal Position Transducer [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM32-43-05-000-801
Installation of the Brake-Pedal Position Transducer [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM32-43-05-400-801
Removal of the Brake Control Valve [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM32-43-09-000-801
Installation of the Brake Control Valve [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM32-43-09-400-801
Removal of the Brake Pressure Transducer [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM32-43-17-000-801
Installation of the Brake Pressure Transducer [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM32-43-17-400-801
Removal of the Brake Shutoff Valve [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM32-43-25-000-801
Installation of the Brake Shutoff Valve [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM32-43-25-400-801
Operational Test of the Brake Shutoff Valve [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM32-43-25-710-801
Removal of the Wheel Speed Transducer [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM32-43-53-000-801
Installation of the Wheel Speed Transducer [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM32-43-53-400-801
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. Access CAIMS to interface with Brake Control system.
  2. Interchange DAUs.
  3. Select associated CAIMS message.
  4. Do close out.

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