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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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10/04/21

Message Overview:

HYD PUMP 3A FAIL
(Advisory)

DDG Reference: 29-13-01
Pilot Action (QRH): ADVISORY 9-2
System Description: 29-13-00
Schematic Diagram: 29-13-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 29-00-05 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Message Description:

DAU 4 is receiving an input that the Hydraulic Pressure Switch 3A is less than 1800 psi (low) with Hydraulic Pump Switch 3A selected to ON.

NOTE: ACMP pressure switches close at 2400 psi (high) as pressure rises and opens at 1800 psi (low) as pressure decreases.

Possible Causes:

  • ACPC Secondary Logic Card (SLC) 4
  • AC-Motor-Driven Pump (ACMP) 3A
  • Relay K24 in AC Power Center (ACPC)
  • Hydraulic Pressure Switch 3A
  • Low Hydraulic Fluid Quantity in Hydraulic System Reservoir 3
  • AC Power Center (ACPC)
  • Data Acquisition Unit (DAU) 4
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Flight Operation Notifications Manual (FONM): None

Quick Links:

Quantity Check of the Hydraulic Reservoir Fluid AMM 12-12-00-610-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of Data Acquisition Units (DAU) AMM 31-42-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of Data Acquisition Units (DAU) AMM 31-42-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of AC Power Center (ACPC) L-Series Contactors AMM 24-51-13-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of AC Power Center (ACPC) L-Series Contactors AMM 24-51-13-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of ACPC AMM 24-51-00-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of ACPC AMM 24-51-00-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of AC Power Center (ACPC) Secondary Logic AMM 24-51-13-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of AC Power Center (ACPC) Secondary Logic AMM 24-51-13-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of No. 1 and No. 2 ACMP AMM 29-12-05-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of No. 1 and No. 2 ACMP AMM 29-12-05-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of Hydraulic Pressure Transducers AMM 29-31-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of Hydraulic Pressure Transducers AMM 29-31-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Pump Operational Inhibits FCOM 2-13-10-24 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wire Repair SPM 20-12-10 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

NOTE: Reference the Pump Operational Inhibits (Quick Links:) prior to beginning troubleshooting.

  1. Ensure No. 3 Hydraulic System is properly serviced.
  2. Operate Hydraulic Pump 3A and note Hydraulic System 3 pressure.

    1. If pump operates and pressure is above 2400 psi, interchange Hydraulic Pressure Switch 3A and 3B. If fault clears, do close out. If fault remains, go to step 7
    2. If pump operates and pressure in below 2400 psi, replace ACMP 3A and do close out.
    3. If pump does not operate, continue with next step.

  3. Perform voltage check at ACMP 3A. Check for 115 VAC at connector B53P1 between pins A and E, pins B and E and pins C and E.

    1. If voltage is present, replace ACMP 3A and do close out.
    2. If voltage is not present, continue with next step.

  4. Interchange ACPC SLC AC-4 with SLC AC-1.

    1. If system checks are good, do close out.
    2. If fault remains, continue with next step.

    illu

  5. Interchange K24 relay with K20 relay in ACPC.

    1. If system checks are good, do close out.
    2. If fault remains, continue with next step.

    illu

  6. Perform wiring check between ACMP 3A, ACPC Relay K24, Hydraulic Pressure Switch 3A and DAU 4.

    1. If fault is found / repaired, do close out.
    2. If fault remains, continue with next step.

  7. Interchange DAU 4 with DAU 2.

    1. If fault is no longer present. Replace failed DAU. do close out
    2. If fault remains, continue with next step.

  8. Accomplish check of EMI filter as shown below.

    1. Remove ACPC Secondary Logic Card 4 (SLC4)
    2. Measure the EMI Filter continuity from connector P410 pin 22 to aircraft structure.

      1. If reading is ground, replace the ACPC and do close out.
      2. If reading is open, continue with next step.

    3. Measure for open circuit between SLC 4, connector P410, pin 22 to pin 25, pin 28, and pin 31.

      1. If reading an open, replace the ACPC.

    illu

  9. Do close out

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