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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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04/07/21

Message Overview:

Message Name:

UHT RELAY FAULT 1B

Message Code:

B3-679255

Associated CAS:

L ENGINE MINOR FAULT
(Advisory)

Reporting LRU: L ENG ECU B UHT
System Description: 31-45-00
Schematic Diagram: 31-45-00
Wiring Diagram: 31-45-01

Message Description:

[MCID 0424]
Left engine UHT relay fault 1B

Possible Causes:

  • Maintenance Diagnostic Computer (MDC) (A4-MDC)

Troubleshooting Tips:

Advisory Wire/Service Bulletin:

  • AW300-45-0033 - Maintenance Diagnostic Tables MDT-3110 for MDC-4110

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Component Location AMM 45-45-00-992-801
Operational Test of the Maintenance Diagnostic System AMM 45-45-00-710-801
Load the Maintenance Diagnostic Computer (MDC) Checklists AMM 45-45-01-970-801
Data Download from the Maintenance Diagnostic Computer (MDC) AMM 45-45-01-970-802
Load the Maintenance Diagnostic Tables (MDT) to the Maintenance Diagnostic Computer (MDC) AMM 45-45-01-970-803
Load the Test and Rigging Files to the Maintenance Diagnostic Computer (MDC) AMM 45-45-01-970-804
Removal of the Maintenance Diagnostic Computer (MDC) AMM 45-45-01-000-801
Installation of the Maintenance Diagnostic Computer (MDC) AMM 45-45-01-400-801
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. MCID 0424 fault present, troubleshoot using the following steps for aircraft and engine fault isolation with reference to the Light Maintenance Manual Task 72-00-00-810-801.

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