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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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Quick Links

04/26/21

Message Overview:

Message Name:

LEFT RIGHT OR APU GENERATOR MAGENTA AND NO VOLTAGE

Identifier: 243OBS005
Effectivity: 20001 - 20500
System: DC Power System
System Description: 24-31-00
Schematic Diagram: 24-31-00
24-31-10
Wiring Diagram: 24-31-05
24-31-07
24-31-09

Message Description:

The left and/or right and/or APU Generator symbol on the DC synoptic page is magenta and no voltage value is displayed.

Possible Causes:

  • Left DC Power Center (LDCPC) (A35)
  • Generator Protection Printed Circuit Board (PCB) 1
  • Right DC Power Center (RDCPC) (A36)
  • Generator Protection Printed Circuit Board (PCB) 2
  • APU DC Power Center (ADCPC) (A196)
  • APU Logic Printed Circuit Board (PCB) 11
  • Data Concentrator Unit (DCU) (A14)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the DC Power Center (DCPC) AMM 24-61-01-000-801
Installation of the DC Power Center (DCPC) AMM 24-61-01-400-801
Removal of the DC Power-Center Protection AMM 24-61-77-000-801
Installation of the DC Power-Center Protection AMM 24-61-77-400-801
Removal of the Data Concentrator Unit (DCU) AMM 31-41-01-000-802
Installation of the Data Concentrator Unit (DCU) AMM 31-41-01-400-802
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Are there more than one generator magenta on the synoptic page?

    1. If YES, go to step 4.
    2. If only one generator is magenta, continue with next step.

  2. Perform a wiring check between the affected Generator Protection/Logic PCB in DCPC and the DCU as follows:
    Left Generator

    From To Result
    A35P1-s A14AP1-11C
    A35P1-w A14AP1-11D

    Right Generator

    From To Result
    A36P1-s A14EP1-1J
    A36P1-w A14EP1-1K

    NOTE: The left (PCB1) and right (PCB2) protection PCBs have the same part numbers and can be swapped for troubleshooting purposes.
    APU Generator

    From To Result
    A196P1-s A14AP1-12C
    A196P1-w A14AP1-12D

    1. If wiring defects are found, repair defective wiring as required and do close out.
    2. If no defects are found, continue with next step.

  3. Replace the affected Protection/Logic PCB as required. Is the fault still present?

    1. If YES, continue with next step.
    2. If NO, do close out.

  4. Access the MDC to view fault messages. Are there any DCU related fault messages?

    1. If YES, use SmartFix Plus to troubleshoot these messages first.
    2. If NO, replace the DCU.

  5. Do close out

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