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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

03/04/21

Message Overview:

Message Name:

LOW TEMP DISCRETE 1 FAIL

Message Code:

B3-527531

Associated CAS:

WING ANTI-ICE FAULT
(Advisory)

Reporting LRU: IASC1
System Description: 21-31-00
Schematic Diagram: 21-31-00
Wiring Diagram: 21-31-01

Message Description:

The hard-wired LOW TEMPERATURE 1 DISCRETE output to the Data Concentrator Unit is detected failed.

Possible Causes:

  • Integrated Air System Controller 1 (IASC) (A55)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

  1. Message# = 1
  2. Comp Id = A055
  3. {Term Definitions}

    1. IAS1A-63 XX 353 01 EXCT XXXX-XXXX XXXX-XXXX XXXX-TXXX 353B: 12; LOW TEMP HW DISCRETE 1

Quick Links:

Removal of the Integrated Air System (IAS) Controller AMM 21-31-01-000-801
Installation of the Integrated Air System (IAS) Controller AMM 21-31-01-400-801
Operational Test of the Integrated Air System (IAS) Controller AMM 21-31-01-710-801
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. Check wiring.

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