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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:

OIL PRESS LOW

Message Code:

B3-006355

Associated CAS:

APU OIL PRESS LOW
(Caution)

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:

For ground operation, this failure triggers a protective shutdown. For flight operation, the shutdown is inhibited.

Possible Causes:

  • Low Oil Pressure
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin:

  • AW300-49-0268 - Potential damage to the Auxiliary Power Unit (APU) Low Oil Pressure Switch Wire

Forum Articles/Infoservice/Newsletter: None

NOTE: If this occurs on first flight of the day or APU start after landing when the oil is cold, replace the oil filter first.

Quick Links:

Servicing of the APU Oil Supply AMM 12-14-09-612-801
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
Removal of the Low Oil-Pressure Switch AMM 49-91-17-000-801
Installation of the Low Oil-Pressure Switch AMM 49-91-17-400-801
Wiring - Maintenance Practices - ALL SPM 20-12-00-02
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Low oil pressure. For ground operation, this failure triggers a protective shutdown. For flight operation, the shutdown is inhibited.

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