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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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For AOG assistance contact:

CRC Montreal (YUL)
Quick Links

06/22/21

Message Overview:

Message Name:

CABIN SYSTEMS UNPOWERED AT AIRCRAFT POWER UP

Message Code: 247OBS002
Effectivity: All
System: Electrical Power
System Description: 24-70-00
Schematic Diagram: None
Wiring Diagram: None

Message Description:

Upon Aircraft power up, some cabin systems may be unpowered.

Possible Causes:

  • Electrical Management System Control Display Unit (EMS CDU) 1 (A94)
  • Electrical Management System Control Display Unit (EMS CDU) 2 (A91)

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter:

Quick Links:

Access of Signboard Menu in EMS CDU AMM 24-00-00-946-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Exit of Signboard Menu in EMS CDU AMM 24-00-00-946-802 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. On the EMS CDU, select EMER CNTL and look at AC and DC CABIN PWR. Record if it is set to "ON" or "OFF".
  2. Select CNTL page 2 and 3 and look at the AC and DC CABIN POWER feeder status and record.
  3. Do not set any of them to "IN" before continuing with next steps.
  4. Download the DCPC and EMS CDU's NVM.
  5. Access the EMS CDU Signboard menu. Select DCPC IN.
  6. Select and record label 014 (DC Cabin Feed) bits 14 to 29.

    Left Column Right column
    29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14
    Label 014

  7. On both EMSCDU access the Signboard menu. Select the "SYSTEM" key and make a selection of CDU Info and afterwards, DCPC Info. Record the Active Microprocessor. Perform two aircraft power up, recording the Cabin power status (steps 1 and 2) and the active Microprocessor every time.

    Result First Power up Second Power up
    CDU INFO Active Microprocessor
    DCPC INFO Active Microprocessor

  8. Using the EMS CDU set all of the Cabin Power to "ON" (steps 1 and 2) and confirm that cabin systems are now working. Repeat step 7 and record values.

    Result First Power up Second Power up
    CDU INFO Active Microprocessor
    DCPC INFO Active Microprocessor

  9. Remove power from the aircraft, access the DCPC logic assembly and replace the defective DCPC Microprocessor cards. Repeat step 7 and record values.

    Result First Power up Second Power up
    CDU INFO Active Microprocessor
    DCPC INFO Active Microprocessor

  10. Send the results to the Bombardier Customer Response Center (CRC).
  11. Do close out.

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