11/24/25
Message Overview:
| DDG Reference: | None |
| Pilot Action (QRH): | ADVISORY 12-2 |
| System Description: | 30-31-00 - Air Data Probes And Sensors |
| Schematic Diagram: | [ Global Express ] [ G5000 ] [ Global XRS ] 30-31-00 - Air Data Sensors Heat Control System - Electrical Schematic [ Global Express ] [ G5000 ] [ Global XRS ] 32-43-00 - Brake Control System - Electrical Schematic |
| Wiring Diagram: | [ Global Express ] [ G5000 ] [ Global XRS ]30-31-03 - Air Data Sensors Heat Control System |
Message Description:
One or more of the brake temperatures is in the white brake temperature indication range (temperature 125 ±15°C (257 ±59°F) and < 400 ±15°C (752 ±59°F )).
NOTE: Usually, BRAKE TEMP (Advisory) is an intermittent type message indicating hot brakes and no further fault isolation is necessary. But, if the message continues or becomes a warning then BRAKE OVHT (Warning) is displayed.
Possible Causes:
- Brake Physically Hot
- Brake Unit
- Brake Control Valve (BCV) (MT53, MT56, MT153, or MT169)
- Brake Pressure Transducer (BPT) (MT51, MT52, MT54, or MT55)
- Brake Control Unit (BCU) (A71)
- Brake Temperature Sensor (BTS) (RT1, RT2, RT3, or RT4)
- Heater Brake Monitoring Unit (HBMU) 1 (A121)
- Heater Brake Monitoring Unit (HBMU) 2 (A93)
- Associated Wiring
Troubleshooting Tips:
Advisory Wire/Service Bulletin: None
Forum Articles/Infoservice/Newsletter: None
NOTES:
- When brakes are used more than necessary, brakes can get hotter than usual and cause the condition.
- Too much wear on a brake unit could result in affecting heat dissipation.
- If this condition occurs on ground when the brakes are cold, then make sure that the related electrical units of the system are serviceable.
- If you find that the brake temperature is high, then examine the mechanical components of the system
Quick Links:
| Removal of Heater/Brake-Temperature Monitoring Unit (HMBU) | AMM 30-31-01-000-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Installation of Heater/Brake-Temperature Monitoring Unit (HMBU) | AMM 30-31-01-400-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Removal of Brake Temperature Sensor | AMM 32-43-61-000-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Installation of Brake Temperature Sensor | AMM 32-43-61-400-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Removal of the BCU | AMM 32-43-01-000-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Installation of the BCU | AMM 32-43-01-400-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Removal of Brake Pressure Transducer | AMM 32-43-17-000-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Installation of Brake Pressure Transducer | AMM 32-43-17-400-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Removal of Brake Control Valve | AMM 32-43-09-000-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Installation of Brake Control Valve | AMM 32-43-09-400-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Wire Repair | SPM 20-12-10 [ Global Express ] [G5000 ] [ Global XRS ] |
Troubleshooting Recommendations:
- Check for brake temperature physically.
- If the brake is not physically hot, go to step 6.
- If the brake is physically hot, continue with next step.
- Swap the BPT. Is the fault still present?
- If YES, continue with next step.
- If NO, replace the defective BPT.
- Swap the BCV. Is the fault still present?
- If YES, continue with next step.
- If NO, replace the defective BCV.
- Swap Brake Unit. Is the fault still present?
- If YES, continue with next step.
- If NO, replace the defective brake unit.
- Perform wiring check between the affected BPT and the BCU.
- If wiring checks are good, continue with next step.
- If wiring checks are not good, repair defective wiring as required.
- Access the PMAT CAIMS active or stored faults. Select displayed message from menu below:
- If no messages are displayed, select the message for the affected brake and perform troubleshooting.
- If all checks for the affected temperature sensor are good, continue with next step.
- Replace the BCU.
- Do close out.