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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:

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Quick Links

04/27/21

Message Overview:

Message Name:

OIL ODOR IN CABIN USING APU BLEED AIR

Identifier: 499OBS001
Effectivity: AIRCRAFT 20001 - 20500
System: APU
System Description: 49-90-00
Schematic Diagram: None
Wiring Diagram: None

Message Description:

Cabin odors noticed by the flight crews or passengers when using the APU as the bleed source for air conditioning.

Possible Causes:

  • APU Carbon Seal
  • Oil Pressure Regulating Valve

Troubleshooting Tips:

Advisory Wire/Service Bulletin:

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Auxiliary Power Unit (APU) Safety Precautions AMM 49-00-00-910-801
General Visual Inspection of the APU Bleed Air Duct in the APU Enclosure AMM 49-16-01-210-801
Component Location AMM 49-91-00-992-801

Troubleshooting Recommendations:

  1. Please review the contents of AW300-49-0242 - APU Compressor Seal Leakage / Cabin Odor Issue and analyze if condition applies.

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