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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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05/15/24

Message Overview:

Fault Message:

ASCA FAILED-ACPC (LEVEL C)

Fault Code:

2451384ACP

Reporting LRU: Auxiliary Power Unit (APU)
Associated CAS: ELEC SYS FAULT (Advisory)
System Description: 24-60-00 - DC Electrical Load Distribution
Schematic Diagram: [ Global Express ]  [ G5000 ]  [ Global XRS ] 24-32-00 - Battery System
[ Global Express ]  [ G5000 ]  [ Global XRS ] 24-62-05-101 - DC Load Distribution APU Starter Contactor Assembly (ASCA) System -Electrical Schematic
Wiring Diagram: [ Global Express ]  [ G5000 ]  [ Global XRS ] 24-62-05-01 - APU Battery Power Control System [ Post SB700-24-034 And 9003, 9004, 9025, 9052-9069, 9070-9084 ]  
[ Global Express ]  [ G5000 ]  [ Global XRS ] 24-62-05-02 - APU Battery Power Control System [ 9085-9158 ]
[ Global Express ]  [ G5000 ]  [ Global XRS ] 24-62-15-1 - APU Battery Power Control [ 9127-9129 ]
[ Global Express ]  [ G5000 ]  [ Global XRS ] 24-62-15-1 - APU Battery Power Control [ All ]
[ Global Express ]  [ G5000 ]  [ Global XRS ] 24-62-15-2 - APU Battery Power Control [ 9130-9249 ]
[ Global Express ]  [ G5000 ]  [ Global XRS ] 24-62-15-3 - APU Battery Power Control [ 9250-9431, 9998 ]

Message Description:

The AC-to-DC Converter Card in the AC Power Center (ACPC) detects a discrepancy between the fuses output voltage status on the output terminal and the related power input voltage of the Auxiliary Power Unit (APU) Starter-Contactor Assembly (ASCA) External DC Power Quality Monitor (EDPQM).

Possible Causes:

  • AC Power Center (ACPC) AC-to-DC Converter Card
  • AC Power Center (ACPC) (A54)
  • Auxiliary Power Unit (APU) Starter-Contactor Assembly (ASCA) (A48)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the AC Power Center (ACPC) AMM 24-51-00-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the AC Power Center (ACPC) AMM 24-51-00-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the AC Power Center (ACPC)
External AC-to-DC Converter		 AMM 24-51-17-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the AC Power Center (ACPC)
External AC-to-DC Converter		 AMM 24-51-17-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the APU Starter-Contactor Assembly AMM 24-62-05-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the APU Starter-Contactor Assembly AMM 24-62-05-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Operational Test of the APU Starter−Contactor Assembly AMM 24−62−05−710−801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. Get access to the Auxiliary Power Unit (APU) Battery and disconnect connector A89P2.
  2. Get access to the APU Start Contactor Assembly (ASCA) and disconnect connector A48P2.
  3. Remove Alternating Control Power Center (ACPC) A/D converter card.
  4. Do wiring checks between the following connections:

    From To Result
    A48P2-K P520A-5
    A48P2-R P520A-35

    ASCA To ACPC Schematic
    a-d_converter_schematic

    1. If there is no continuity, repair defective wiring as required and do close out.
    2. If there is continuity, continue with the next step.

  5. Do continuity checks between the following connections:

    From To Result
    A48P2-K Ground
    A48P2-R Ground

    1. If there is continuity, continue with the next step
    2. If there is no continuity, go to step 8

  6. Get access to the ACPC and disconnect connector A54P4.
  7. Do continuity checks between ASCA and ground as follow:

    From To Result
    A48P2-K Ground
    A48P2-R Ground

    1. If there is continuity, repair defective wiring as required and do close out.
    2. If there is continuity, go to step 11

  8. Get access to "view fault messages" in the OMS and check for ACPC external A/D converter card (A9) failed message.

    1. If there is no fault message, go to step 10.
    2. If there is fault message, continue with the next step.

  9. Replace A/D converter card.

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

  10. Replace ASCA.

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

  11. Replace ACPC
  12. Do close out.

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