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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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04/13/21

Message Overview:

Message Name:

FUEL TEMP/BYPASS 1B

Message Code:

B3-303003

Associated CAS Message:

None

Reporting LRU: L ENG FUEL T/B
System Description: 73-30-00
Schematic Diagram: 73-21-00 Sh. 3
Wiring Diagram: None

Message Description:

Left engine fuel temperature/impending bypass fault 1B.

[MCID 0131]
Fuel Temperature/By-Pass 1B.
A fault in the fuel temperature/fuel bypass sensors harness between the sensors and the ECU B was sensed.

Possible Causes:

  • Wiring Harness (W6)
  • Wiring Harness (W4)
  • Fuel Temperature/Impending By-pass Switch
  • Full Authority Digital Engine Control Unit (FADEC) Electronic Control Unit B (ECU) (A43)

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Component Location AMM 28-41-00-992-801
General Visual Inspection of the Engine Wiring Harness AMM 71-50-00-210-802
Removal of the FADEC Electrical Harness from the Left Engine AMM 71-50-05-000-802
Installation of the FADEC Electrical Harness on the Left Engine AMM 71-50-05-400-802
Removal of the Fuel Pressure Switch AMM 73-30-01-000-801
Installation of the Fuel Pressure Switch AMM 73-30-01-400-801
Removal of the Impending Filter Bypass Switch AMM 73-30-03-000-801
Installation of the Impending Filter Bypass Switch AMM 73-30-03-400-801
Component Location AMM 76-10-00-992-801
Removal of the Engine Electronic Control Unit (ECU) AMM 76-10-05-000-801
Installation of the Engine Electronic Control Unit (ECU) AMM 76-10-05-400-801
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 0131 fault present, troubleshoot using the following steps for aircraft and engine fault isolation with reference to the Light Engine Maintenance Manual TASK 72-00-00-810-030.

CB3-C3

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