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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

02/22/21

Message Overview:

Message Name:

APU STARTS AND THEN SHUTS DOWN

Identifier: 496OBS001
Effectivity: AIRCRAFT 20501 - 20999
System: APU
System Description: 49-60-00
Schematic Diagram: 49-61-00 Sheet 3
Wiring Diagram: 49-61-01 sh 1
49-61-01 sh 2

Message Description:

The APU starts up and then shuts down.

Possible Causes:

  • Load Control Valve (LCV) (V8)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Load Control Valve AMM 49-52-01-000-801
Installation of the Load Control Valve AMM 49-52-01-400-801
Deactivation of the Load Control Valve AMM 49-52-01-040-801
Activation of the Load Control Valve AMM 49-52-01-440-801
Wiring - Maintenance Practices - ALL SPM 20-12-00-02
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02
Electrical Connectors - Maintenance Practice - ALL SPM 20-20-00-02

Troubleshooting Recommendations:

  1. Inspect the Load Control Valve (V8). Is it stuck open?

    1. If YES, free up the valve or replace it.
    2. If NO, call tech support.

  2. Do close out.

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