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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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04/08/21

Message Overview:

Message Name:

BLEED REVERSE FLOW

Message Code:

B3-006358

Associated CAS:

APU FAULT
(Advisory)

Reporting LRU: APU
System Description: 49-00-00
Schematic Diagram: 49-61-00
Wiring Diagram: 49-61-01 Sh 1
49-61-01 Sh 2

Message Description:

The inlet temperature exceeds 350°F for more than 5 seconds. For ground operation, this failure triggers a protective shutdown. For flight operation, the shutdown is inhibited.

Possible Causes:

  • Auxiliary Power Unit (APU)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Fault Confirmation Procedure:

  1. Message# = 13
  2. {Term Definitions}

    1. APU-52 XX 353 01 EXCT XXXX-XXXX XXXX-XXTX XXXX-XXXX 353: 18; APU REVERSE FLOW

Quick Links:

Removal of the Bleed Air Duct AMM 49-16-01-000-801
Installation of the Bleed Air Duct AMM 49-16-01-400-801
General Visual Inspection of the APU Bleed Air Duct in the APU Enclosure AMM 49-16-01-210-801
Removal of the Auxiliary Power Unit (APU) Electronic Control Unit (ECU) AMM 49-61-01-000-801
Installation of the Auxiliary Power Unit (APU) Electronic Control Unit (ECU) AMM 49-61-01-400-801
Wiring - Maintenance Practices - ALL SPM 20-12-00-02
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02

Troubleshooting Recommendations:

  1. APU reverse flow condition. The inlet temperature exceeds 350°F for more than 5 seconds. For ground operation, this failure triggers a protective shutdown. For flight operation, the shutdown is inhibited.

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