04/30/24
Message Overview:
Message Name:
LH HIGH PRESSURE BLEED VALVE CYCLING ON AND OFF
| Message Code: | 361OBS015 |
| Effectivity: | All |
| System: | Bleed Air System |
| System Description: | 36-11-00 - Bleed Air System |
| Schematic Diagram: | [ Global Express ] [ G5000 ] [ Global XRS ] 36-11-00-101 - Bleed Air System - Electrical Schematic |
| Wiring Diagram: | [ Global Express ] [ G5000 ] [ Global XRS ] 36-11-00-3_003 - Sheet 3 - Power (Left) - [9002] [ Global Express ] [ G5000 ] [ Global XRS ] 36-11-00-1_003 - Sheet 3 - Power (Left) - [9004-9010] [ Global Express ] [ G5000 ] [ Global XRS ] 36-11-00-2_003 - Sheet 3 - Power (Left) - [9003, 9011-9158] [ Global Express ] [ G5000 ] [ Global XRS ] 36-11-03-1_001-Sheet 1 - Power (Left) - ALL [ Global Express ] [ G5000 ] [ Global XRS ] 71-50-00-1_009 - Sheet 9 - General Services - ALL |
Message Description:
Left Bleed Valve Cycling On and Off.
Possible Causes:
- High Pressure Bleed Shutoff Valve (HPBSV)
- Intermediate Port Pressure Transducer (IPPT)
- Bleed Management Computer (BMC) # 1 (A69)
- Junction Box (JB) 3
- Associated Wiring
Troubleshooting Tips:
Advisory Wire/Service Bulletin: None
Forum Articles/Infoservice/Newsletter: None
Quick Links:
| 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 |
| Removal of the Junction Box JB3 | [ G5000 ] [ Global Express ] [ Global XRS ] AMM24-00-01-000-801 |
| Installation of the Junction Box JB3 | [ G5000 ] [ Global Express ] [ Global XRS ] AMM24-00-01-400-801 |
| Operational Test of Junction Box JB3 | [ G5000 ] [ Global Express ] [ Global XRS ] AMM24-00-01-710-801 |
| Removal of the High-Pressure-Bleed Shutoff Valve | [ G5000 ] [ Global Express ] [ Global XRS ] AMM36-11-01-000-801 |
| Installation of the High-Pressure-Bleed Shutoff Valve | [ G5000 ] [ Global Express ] [ Global XRS ] AMM36-11-01-400-801 |
| Operational Test of the High-Pressure-Bleed Shutoff Valve | [ G5000 ] [ Global Express ] [ Global XRS ] AMM36-11-01-710-801 |
| Removal of the Bleed Management Controller | [ G5000 ] [ Global Express ] [ Global XRS ] AMM36-11-33-000-801 |
| Installation of the Bleed Management Controller | [ G5000 ] [ Global Express ] [ Global XRS ] AMM36-11-33-400-801 |
| Operational Test of the Bleed Management Controller | [ G5000 ] [ Global Express ] [ Global XRS ] AMM36-11-33-710-801 |
| Removal of the Intermediate-Pressure Transducer | [ G5000 ] [ Global Express ] [ Global XRS ] AMM36-11-37-000-801 |
| Installation of the Intermediate-Pressure Transducer | [ G5000 ] [ Global Express ] [ Global XRS ] AMM36-11-37-400-801 |
| Operational Test of the Intermediate-Pressure Transducer | [ G5000 ] [ Global Express ] [ Global XRS ] AMM36-11-37-710-801 |
| Safety Precautions - Maintenance Practices | [ G5000 ] [ Global Express ] [ Global XRS ] SPM20-00-01-02 |
| Wire Repair - Maintenance Practices | [ G5000 ] [ Global Express ] [ Global XRS ] SPM20-12-10-02 |
Troubleshooting Recommendations:
- Do AMM Task "36-11-01-710-801 - Operational Test of the High-Pressure-Bleed Shutoff Valve".
- Are results satisfactory?
- If YES, do close out.
- If NO, continue with the next step.
- Interchange the High Pressure Bleed Shutoff Valve (HPV) from left engine to right engine.
- Are results satisfactory?
- If YES, do close out.
- If NO, continue with the next step.
- Did the issue follow the HPV?
- If YES, replace the defective HPV.
- If NO, continue with the next step.
- Interchange the Intermediate Pressure Port Transducer (IPPT).
- Does the issue follow the IPPT?
- If YES, replace the defective IPPT. Do close out.
- If NO, continue with the next step.
- Do Wiring Checks as follows:
LRU From To Expected Result Result LH Engine/IPT P734-A P734-B 28 VDC NOTE: The IPPT is referred to as the 5th Stage Offtake Pressure Transducer in the Wiring Manual
- Are the results satisfactory?
- If the 28 VDC is available at the IPPT continue with the next step.
- If 28 VDC is not available, troubleshoot the source of power.
- Do the BMC 1 voltage / wiring Check as follows:
From To Expected Result Access LRU Connector/Contacts Access LRU Connector/Contacts Value, Unit, Tolerance 141AB SPDA 2 (A14) A14P3-K 141AB BMC 1 (A69) A69P2-2 28V DC 141AB BMC 1 (A69) A69P2-3 141AB GS GS444 Continuity 141AB SPDA 2 (A14) A14P2-H 141AB BMC 1 (A69) A69P1-54 28V DC 141AB BMC 1 (A69) A69P1-55 141AB GS GS445 Continuity - Is the voltage check within the range expected?
- If YES, continue with the next step.
- If NO, troubleshooting the power source, or repair defective wiring as required and do close out.
- Interchange the BMC.
- Does the issue follow the BMC?
- If YES, replace the defective BMC. Do close out.
- If NO, continue with the next step.
- Do wiring check as follows:
LRU Effectivity From To Expected Result Result JB3 [ 9002 TO 9119 ] JB3/PCB2-TP40 BMC1 - A69P1-31 28V DC JB3 [ 9120 TO 9158 ] JB3/PCB2-TP39 BMC1 - A69P1-31 28V DC - Are results satisfactory?
- If YES, continue with the next step.
- If NO, repair defective wiring as required and do close out.
- Do wiring check as follows.
LRU From To Expected Result Result Effectivity IPPT1 (LEFT ENGINE) P734-C BMC1 - A69P1-2 Continuity All IPPT1 (LEFT ENGINE) P734-D BMC1 - A69P1-3 Continuity All - Are results satisfactory?
- If YES, continue with the next step.
- If NO, repair defective wiring as required and do close out.
- Do close out.