06/27/24
Message Overview:
Message Name:
AUTOBRAKE SELECTOR SWITCH WILL NOT ARM IN ANY OF THE POSITIONS
| Message Code: | 324OBS001 |
| Effectivity: | All |
| System: | Brake Control System |
| System Description: | 32-43-00 |
| Schematic Diagram: | [ Global Express ] [ G5000 ] [ Global XRS ] 32-43-00-101 Brake Control System - Electrical Schematic |
| Wiring Diagram: | [ Global Express ] [ G5000 ] [ Global XRS ] 32-43-00-3_004 Sheet 4 - Indication [ 9002 ] [ Global Express ] [ G5000 ] [ Global XRS ] 32-43-00-3_007 Sheet 7 - Ground Lift Dumping/Autobrake Panel (AP23) - Autobrake Switch [ 9002 ] [ Global Express ] [ G5000 ] [ Global XRS ] 32-43-00-1_004 Sheet 4 - Indication - [ 9004-9024 ] [ Global Express ] [ G5000 ] [ Global XRS ] 32-43-00-1_007 Sheet 7 - GND Lift Dumping/Autobrake Panel (AP23) - AutoBrake Switch [ 9004-9024 ] [ Global Express ] [ G5000 ] [ Global XRS ] 32-43-00-2_004 Sheet 4 - Indication - [ 9003, 9025-9158 ] [ Global Express ] [ G5000 ] [ Global XRS ] 32-43-00-2_007 Sheet 7 - GND Lift Dumping/Autobrake Panel (AP23) - Autobrake Switch - [ 9003, 9025-9158 ] [ Global Express ] [ G5000 ] [ Global XRS ] 32-43-04-1_001 Sheet 1 - Indication - [ ALL ] [ Global Express ] [ G5000 ] [ Global XRS ] 32-43-06-1_002 Sheet 2 - Autobrake Switch - [ ALL ] |
Message Description:
AUTOBRAKE switch is set to LO, MED or HI but it does not latch in position.
Possible Causes:
- Autobrake Selector Switch
- Brake Control Unit (BCU) (A71)
- GND Lift Dumping and Autobrake Control Panel (AP23)
- Associated Wiring
Troubleshooting Tips:
Advisory Wire/Service Bulletin: None
Forum Articles/Infoservice/Newsletter: None
Flight Operation Notifications Manual (FONM): None
Autobrake arming required conditions:
- Weight OFF Wheels
- GND Spoilers not deployed
- Brake pedals not pressed (less than 20%)
- Wheel Speed=0 kts
- No Autobrake or Brake Control Faults
- Autobrake switch in LO, MED or HI position
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 GND LIFT DUMPING and AUTO BRAKE Control Panel |
AMM 32-43-45-000-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Installation of the GND LIFT DUMPING and AUTO BRAKE Control Panel |
AMM 32-43-45-400-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Wire Repair - Maintenance Practices - ALL | SPM 20-12-10-02 [ Global Express ] [ G5000 ] [ Global XRS ] |
Troubleshooting Recommendations:
- Make sure all required conditions for Autobrake arming are met (See troubleshooting Tips). Can the Autobrake switch be armed?
- If YES, do close out.
- If NO, continue with next step.
- Disconnect Autobrake Selector Switch connector AP23P3 located on the control panel (AP23) and BCU connector (A71BP1). Perform a continuity check as follows:
From To Result AP23P3-11 Ground AP23P3-13 Ground - If there is continuity, repair defective wiring as required and do close out.
- If there is no continuity, continue with next step.
- Perform a continuity check as follows:
From To Result AP23P3-11 A71BP1-10D AP23P3-13 A71BP1-11C - If there is no continuity, repair defective wiring as required and do close out.
- If there is continuity, continue with next step.
- Replace the Autobrake Selector Switch. Is the fault still present?
NOTE: You can attempt to exercise/test the Autobrake Selector Switch Arm Solenoid using an external 10 VDC power supply prior to replacing the switch assembly.- If NO, do close out.
- If YES, continue with next step.
- Replace the Brake Control Unit.
- Do close out.
