06/29/21
Message Overview:
Message Name:
HYDRAULIC PRESSURE SWITCHES FAULT CONDITION SENSED
| Message Code: | 293OBS012 |
| Effectivity: | All |
| System: | Engine Indicating |
| System Description: | 29-30-00 |
| Schematic Diagram: | 29-12-00 [ Global Express ] [ G5000 ] [ Global XRS ] 29-13-00 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Wiring Diagram: | 29-00-03 [ Global Express ] [ G5000 ] [ Global XRS ] |
Message Description:
A hydraulic pressure-switch fault condition is sensed. All other fault conditions for a pressure switch indication are satisfactory. These procedures apply to the pressure switches of the Hydraulic System 1, Hydraulic System 2 and Hydraulic System 3.
Possible Causes:
- Engine-Driven Hydraulic Pump (EDP) 1A Pressure-Switch (S34)
- Engine-Driven Hydraulic Pump (EDP) 2A Pressure-Switch (S37)
- AC Motor Pump (ACMP) 1B Pressure-Switch (S36)
- AC Motor Pump (ACMP) 2B Pressure-Switch (S38)
- AC Motor Pump (ACMP) 3A Pressure-Switch (S39)
- AC Motor Pump (ACMP) 3B Pressure-Switch (S40)
- Associated Wiring
Troubleshooting Tips:
Advisory Wire/Service Bulletin: None
Forum Articles/Infoservice/Newsletter: None
Quick Links:
| Opening of Non-Thermal Circuit Breakers | AMM 24-00-00-863-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Closing of Non-Thermal Circuit Breakers | AMM 24-00-00-863-802 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Electrical/Electronic Safety Precautions | AMM 24-00-00-910-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Hydraulic Safety Precautions | AMM 29-00-00-910-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Hydraulic Technical Precautions | AMM 29-00-00-910-802 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Removal of the Hydraulic Pressure Switches | AMM 29-31-05-000-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Installation of the Hydraulic Pressure Switches | AMM 29-31-05-400-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Safety Precautions - Maintenance Practices - ALL | SPM 20-00-01-02 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Wire Repair - Maintenance Practices - ALL | SPM 20-12-10-02 [ Global Express ] [ G5000 ] [ Global XRS ] |
Troubleshooting Recommendations:
- Perform a troubleshooting of a pressure-switch with a HIGH fault condition. Set the selection to the HYDRAULIC synoptic page (HSP) on the EICAS. Check if the hydraulic pump flow-line between the system EDP/ACMP and the PSI indication is green.
- If the hydraulic pump flow-line between the system EDP/ACMP and the PSI indication is green, replace the defective hydraulic pressure-switch and do close out.
- If the hydraulic pump flow-line between the system EDP/ACMP and the PSI indication is not green, continue the next step.
- Perform a troubleshooting of a pressure-switch with a LOW fault condition.
- If system checks are good, do close out.
- If fault remains, continue with next step.
- Disconnect the connectors S34P1 for the EDP 1A, S36P1 for the ACMP 1B, S37P1 for the EDP 2A, S38P1 for the ACMP 2B, S39P1 for the ACMP 3A, S40P1 for the ACMP 3B from the hydraulic pressure-switch as applicable. Perform a continuity check between pin A and pin F on the hydraulic pressure-switch.
NOTE: Not all pins on the pressure-switch are connected. The wiring manual does not show pins that are not connected.- If there is no continuity, replace the defective hydraulic pressure switch and do close out.
- If there is continuity, continue with next step.
- Do close out.