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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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10/29/25

Message Overview:

Message Name:

L ENG FAN - TRIM BALANCE

Message Code:

7735324BRV

Associated CAS:

None

Reporting LRU: Engine Vibration Monitoring Unit (EVMU)
System Description: 77-30-00 - Analyzers
Schematic Diagram: 77-31-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 71-50-01 [ Global Express ]  [ G5000 ]  [ Global XRS ]
77-31-01 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Message Description:

Left Engine Low Pressure (LP) system requires trim balancing.

Possible Causes:

  • Engine Low Pressure (LP) System
  • LHE N1 vibration >= 0.5 ips (green)

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Full Throttle Blog/Forum Articles/Infoservice/Newsletter: None

Flight Operation Notifications Manual (FONM): None

NOTES:

  • When performing the EMM 71-00-00-866-816 - Low Pressure (LP) Compressor (Fan) Trim Balance if the raw balance solution from CAIMS is the selected method, ensure that the existing figures are noted before performing any engine runs. As this will require the EVMU to capture 6 new engine runs before computation of data will indicate in the RAW data calculations.

Quick Links:


Standard Aircraft Configuration for Maintenance [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM12-00-00-867-801
Connect Electrical Power to the Aircraft [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM24-00-00-861-801
Electrical/Electronic Safety Precautions [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM24-00-00-910-801
Electrostatic Discharge Safety Precautions [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM24-00-00-910-802
Access to Active Faults [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM45-45-00-970-802
Access to Stored Faults [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM45-45-00-970-803
Access to System Diagnostics [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM45-45-00-970-804
Removal of the Engine Vibration-Monitoring Unit (EVMU) [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM77-31-04-000-801
Installation of the Engine Vibration-Monitoring Unit (EVMU) [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM77-31-04-400-801
Operational Test of the Engine Vibration-Monitoring Unit (EVMU) [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM77-31-04-710-801
LP System Trim Balancing [ G5000 ]  [ Global Express ]  [ Global XRS ] EMM 71-00-00-866-816

Troubleshooting Recommendations:

  1. Perform Operational check of the EVHMU.

    1. Interrogate CAIMS and record fault occurrences. 
    2. Check for occurrences of fault message L ENG FAN - TRIM BALANCE

  2. Perform a visual inspection of the LHE LP compressor blades.

    1. If damage is not found, continue with next step.
    2. Do the fan trim balance procedure on the RHE.

  3. Do close out and record troubleshooting actions undertaken in maintenance logbook, if fault does not appear.

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