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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

04/26/21

Message Overview:

Message Name:

LEFT SIDE ANNUNICATOR LIGHTS INOP

Identifier: 331OBS001
Effectivity: AIRCRAFT 20501 - 20999
System: Lights
Associated CAS: None
System Description: 33-11-00
Schematic Diagram: 33-11-00
Wiring Diagram: 33-11-01

Message Description:

Annunciator lights for the left side of the airplane inop, Airshow screens inop, LAV light panel inop. The switches associated with the annunciators function, this can be verified on the systems synoptic pages.

The LDU is not a reportable LRU to the MDC, therefore there will be no MDC messages for this fault.

Possible Causes:

  • Integral Lighting Controller (PS8)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Component Location AMM 33-11-00-992-801
Removal of the Integral Lighting Controller AMM 33-11-01-000-801
Installation of the Integral Lighting Controller AMM 33-11-01-400-801
Operational Test of the Integral Lighting Controller AMM 33-11-01-710-801
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. Removed and replace the lamp driver power supply.

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