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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 SYSTEM HMU 4

Message Code:

B3-303014

Associated CAS:

L FADEC FAIL
(Caution)

L ENGINE FAULT
(Advisory)

Reporting LRU: L ENG HMU
System Description: 73-30-00
Schematic Diagram: 73-21-00
Wiring Diagram: None

Message Description:

Left engine fuel system HMU fault 4.

[MCID 0112]
Fuel system HMU 4.
A fault was sensed in the HMU sensors/effectors.

Possible Causes:

  • Hydromechanical Unit (HMU)
  • W3 Wiring Harness
  • W4 Wiring Harness

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

  1. If the 'L' or 'R ENG MINOR FAULT' advisory CAS message is shown with this fault, this is a Short Term dispatch (STD) fault and is subject to correction outlined in the Honeywell LEMM SUB TASK 5-10-00-200-003.
  2. If a L or R FADEC FAIL CAS message is shown, this is a No Dispatch (ND) fault and is subject to correction outlined in the Honeywell LEMM SUB TASK 5-10-00-200-003.
  3. Check for the following MDC messages displayed with the fault: X-channel bus 1A (MCID 0905), X-channel bus 1B (MCID 0906), X-channel discrete 1A (MCID 0933), X-channel discrete 1B (MCID 0934). If any of the above MCID codes are posted, correct the cross channel faults first.

Quick Links:

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
Component Location AMM 73-20-00-992-801
Removal of the Hydromechanical Unit (HMU) AMM 73-20-01-000-801
Installation of the Hydromechanical Unit (HMU) AMM 73-20-01-400-801
Functional Test of the Hydromechanical Unit (HMU) Motive Flow Pressure AMM 73-20-01-720-801
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 0112 fault only is present, troubleshoot using the Light Engine Maintenance Manual TASK 72-00-00-810-011

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