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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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10/09/20

Message Overview:

Fault Message:

ACPC ELECTRONIC MODULE #2-EM2 FAIL

Fault Code:

2451367ACP

Associated CAS:

ELEC SYS FAULT
(Advisory)

Reporting LRU: AC Power Center (ACPC)
System Description: 24-50-00
Schematic Diagram: 24-51-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 24-51-01 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Fault Description:

The AC-to-DC Converter Card monitors fuses and diodes status on Electronic Module (EM) 2.

  1. Voltage status on the output terminal for each fuse will be verified against related power input voltage in order to determine if any fuse is open. If any open fuse is found, the test for that Electronic Module will fail.
  2. Voltage status on the anode for each Diode will be compared against power input voltage. If an anode voltage is detected while no voltage is present at the associated power input, this will indicate a Diode short circuit fault and a fuse open fault. The test of that Electronic Module will fail.
  3. The voltage status of Diode coil power will be compared against anode voltage on each Diode to determine if any Diode has failed open. This test will be limited to Diodes associated with power inputs.

Possible Causes:

  • Electronic Module (EM2)
  • AC-to-DC Converter Card
  • Right Microprocessor Card
  • AC Power Center (ACPC) (A54)
  • 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) Fault-Tolerant Microprocessor AMM 24-51-05-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the AC Power Center (ACPC) Fault-Tolerant Microprocessor AMM 24-51-05-400-801 [ 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 AC Power Center (ACPC) Electronic Modules AMM 24-51-81-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the AC Power Center (ACPC) Electronic Modules AMM 24-51-81-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]
AC Power Center Component Maintenance Manual CMM 24-51-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. Select EXT AC to on.
  2. On EMS CDU 1, select Diagnostic mode.

    1. Select SYSTEM - CNTL key (page 1/3).
    2. Select lower left side key.
    3. Select lower right side key.

  3. On EMS CDU 1, select ACPC IN.
  4. Record labels 045 and 046 on the table below:

    Left Column Right Column
    Bit 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14
    Label 045
    Label 046

  5. Refer to table 1 and compare data.

    1. Bit=0: voltage is not present
    2. Bit=1: voltage is present

      3. Component Test Point 1 Test Point 2 Refer to step
      Input Voltage Label Bit Output Voltage Label Bit
      F 1 ACPC A STA 045 14 D5 A STA 045 16 6
      F2 ACPC B STA 045 17 D6 A STA 045 24 9
      F3 ACPC C STA 045 27 D7 A STA 045 20 12
      F4 EXT AC TRU 045 28 D8 A STA 045 25 15
      F5 ACPC A STA 045 14 28 VDC 1-B 046 26 18
      F6 ACPC C STA 045 27 28 VDC 2-B 046 27 22
      F7 ACPC B STA 045 17 28 VDC 3-B 046 28 26
      F8 EXT AC TRU 045 28 28 VDC 4-B 046 29 30
      D1 D5 A STA 045 16 D5D8 C STA 045 21 34
      D2 D6 A STA 045 24 D5D8 C STA 045 21 37
      D3 D7 A STA 045 20 D5D8 C STA 045 21 40
      D4 D8 A STA 045 25 D5D8 C STA 045 21 43

      Fuse F2 (Label 045 bit 17=1 and bit 24=0)

  6. Disconnect EM2 connector P206 and remove AD converter card. Perform a continuity check as follows:

    From To Result
    P206-1 Ground

    1. If there is no continuity, continue with next step.
    2. If there is continuity, go to step 19.
      Fuse F2 (Label 045 bit 17=1 and bit 24=0)

  7. Disconnect EM2 connector P206 and remove AD converter card. Perform a continuity check as follows:

    From To Result
    P206-2 Ground

    1. If there is no continuity, continue with next step.
    2. If there is continuity, go to step 19.
      Fuse F3 (Label 045 bit 27=1 and bit 20=0)

  8. Disconnect EM2 connector P206 and remove AD converter card. Perform a continuity check as follows:

    From To Result
    P206-3 Ground

    1. If there is no continuity, continue with next step.
    2. If there is continuity, go to step 19.
      Fuse F4 (Label 045 bit 28=1 and bit 25=0)
      NOTE: If label 045 bit 28=0 and external AC is ON, investigate EXT AC TRU and EM3.

  9. Disconnect EM2 connector P206 and remove AD converter card. Perform a continuity check as follows:

    From To Result
    P206-4 Ground

    1. If there is no continuity, continue with next step.
    2. If there is continuity, go to step 19.
      Fuse F5 (Label 045 bit 14=1 and label 046 bit 26=0)

  10. Disconnect EM2 connector P206 and remove AD converter card and right microprocessor card. Perform a continuity check as follows:

    From To Result
    P206-15 Ground

    1. If there is no continuity, continue with next step.
    2. If there is continuity, go to step 19.
      Fuse F6 (Label 045 bit 27=1 and label 046 bit 27=0)

  11. Disconnect EM2 connector P206 and remove AD converter card and right microprocessor card. Perform a continuity check as follows:

    From To Result
    P206-16 Ground

    1. If there is no continuity, continue with next step.
    2. If there is continuity, go to step 19.
      Fuse F7 (Label 045 bit 17=1 and label 046 bit 28=0)

  12. Disconnect EM2 connector P206 and remove AD converter card and right microprocessor card. Perform a continuity check as follows:

    From To Result
    P206-17 Ground

    1. If there is no continuity, continue with next step.
    2. If there is continuity, go to step 19.
      Fuse F8 (Label 045 bit 28=1 and label 046 bit 29=0)

  13. Disconnect EM2 connector P206 and remove AD converter card and right microprocessor card. Perform a continuity check as follows:

    From To Result
    P206-18 Ground

    1. If there is no continuity, continue with next step.
    2. If there is continuity, go to step 19.
      Diode D1
      Troubleshooting tip and system description:
      There are two conditions to get failure of diode D1.
      Shorted diode D1: External AC power=ON
      Circuit breaker ACPC PWR A=OUT
      Label 045 bit 14=0
      Label 045 bit 16=1
      Label 045 bit 21=1
      Opened diode D1: Battery master switch=ON
      External AC power cord is not attached to the aircraft
      Circuit breaker ACPC PWR A=IN
      Label 045 bit 14=1
      Label 045 bit 16=1
      Label 045 bit 21=0

  14. Disconnect EM2 connector P206 and remove AD converter card. Perform a continuity check as follows:

    From To Result
    P206-1 Ground
    P206-9 Ground

    1. If there is no continuity, continue with next step.
    2. If there is continuity, go to step 19.
      Diode D2
      Troubleshooting tip and system description:
      There are two conditions to get failure of diode D2.
      Shorted diode D2: External AC power=ON
      Circuit breaker ACPC PWR B=OUT
      Label 045 bit17=0
      Label 045 bit24=1
      Label 045 bit21=1
      Opened diode D2: APU GEN power=ON
      External AC power cord is not attached to the aircraft
      Circuit breaker ACPC PWR A=OUT
      Circuit breaker ACPC PWR B=IN
      Circuit breaker ACPC PWR C=OUT
      AC BUS 1 and AC BUS 2=unpowered

  15. Disconnect EM2 connector P206 and remove AD converter card. Perform a continuity check as follows:

    From To Result
    P206-2 Ground
    P206-9 Ground

    1. If there is no continuity, continue with next step.
    2. If there is continuity, go to step 19.
      Diode D3
      Troubleshooting tip and system description:
      There are two conditions to get failure of diode D3.
      Shorted diode D3: External AC power=ON>
      Circuit breaker ACPC PWR C=OUT
      Label 045 bit27=0
      Label 045 bit20=1
      Label 045 bit 21=1
      Opened diode D3:APU GEN power=ON
      External AC power cord is not attached to the aircraft
      Circuit breaker ACPC PWR A=OUT
      Circuit breaker ACPC PWR B=OUT
      Circuit breaker ACPC PWR C=IN
      Circuit breaker TRU 1=OUT
      AC BUS 1 and AC BUS 2=unpowered

  16. Disconnect EM2 connector P206 and remove AD converter card. Perform a continuity check as follows:

    From To Result
    P206-3 Ground
    P206-9 Ground

    1. If there is no continuity, continue with next step.
    2. If there is continuity, go to step 19.
      Diode D4
      Troubleshooting tip and system description:
      There are two conditions to get failure of diode D4.
      Shorted diode D4: Battery master switch=ON
      Circuit breaker ACPC PWR A=IN
      External AC power cord is not attached to the aircraft
      Label 045 bit28=0
      Label 045 bit25=1
      Label 045 bit21=1
      Opened diode D4: Battery master switch=ON
      External AC is ON
      Circuit breaker ACPC PWR A=OUT
      Circuit breaker ACPC PWR B=OUT
      Circuit breaker ACPC PWR C=OUT
      Label 045 bit28=1
      Label 045 bit25=1
      Label 045 bit21=0

  17. Disconnect EM2 connector P206 and remove AD converter card. Perform a continuity check as follows:

    From To Result
    P206-4 Ground
    P206-9 Ground

    1. If there is no continuity, continue with next step.
    2. If there is continuity, go to step 19.

  18. Replace EM2.

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

  19. Replace ACPC.
  20. Do close out.

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