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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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10/29/19

Message Overview:

APU REVERSE FLOW
(Caution)

DDG Reference: 49-60-00
Pilot Action (QRH): ABNORM 4-5
System Description: 49-60-00
Schematic Diagram: 49-61-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 49-61-01 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Fault Description:

A reverse flow condition has occurred during flight. A reverse flow condition occurs when the APU inlet temperature is more than 350°F (176.7°C) for five seconds.

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Possible Causes:

  • Load Control Valve
  • Bleed Air Check Valve
  • Engine Branched Wiring Harness
  • Full Authority Digital Engine Controller (FADEC)

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick links:

Removal of the Load Control Valve AMM 49-52-05-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Load Control Valve AMM 49-52-05-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Bleed-Air check valve AMM 49-52-09-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Bleed-Air check valve AMM 49-52-09-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Full Authority Digital Engine Controller (FADEC) AMM 49-61-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Full Authority Digital Engine Controller (FADEC) AMM 49-61-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
APU Electrical Harness Wiring Diagram 49-12-00 WM 49-12-00 [ Global Express ]
Wire Repair SPM 20-12-10 [ Global Express ]  [ G5000 ]  [Global XRS ]

Troubleshooting Recommendations:

  1. Examine the engine branched wiring-harness for bare wiring, kinks, worn areas and other damage.
  2. Examine the APU and the area around the APU for signs of fire.
  3. Swap or replace the bleed-air check valve.
  4. Swap or replace the Load Control valve.
  5. Swap or replace the FADEC.
  6. Do close out.

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