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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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07/06/21

Message Overview:

Message Name:

N1 VIBRATION EXCEEDANCE

Message Code: 771OBS007
Effectivity: All
System: Engine Power Indicating System
System Description: 77-10-00
Schematic Diagram: None
Wiring Diagram: None

Message Description:

This procedure is for the Engine that has N1 Vibration Exceedance. It gives data to do an inspection of Engine Components to make sure that they are serviceable. If you are not sure about the Vibration Indication, the fault isolation procedure for the high N1 VIBRATION Indication on the Engine Indication and Crew Alerting System (EICAS) Primary Display must be done before this procedure.

Possible Causes:

  • Fuel Tube 20

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Detailed Inspection of the Engine after Bird Strike AMM 05-52-04-220-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Detailed Inspection of the Engine after
Shedding/Ingestion of Ice		 AMM 05-52-06-220-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Detailed Inspection of the Engine after
In-Flight Shutdown		 AMM 05-52-07-220-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Electrical/Electronic Safety Precautions AMM 24-00-00-910-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Engine Safety Precautions AMM 71-00-00-910-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
General Visual Inspection of the Engines - Internal AMM 71-00-00-210-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Low Pressure (LP) Compressor (Fan)
Trim Balance		 EMM 71-00-00-866-816 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Power Assurance Test EMM 71-00-00-866-818 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Fuel Tube EMM 73-12-03-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Detailed Inspection of the Fuel Manifold EMM 73-12-03-220-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Fuel Tube EMM 73-12-03-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. Perform the general visual inspection of the engines - internal.

    1. If the system checks are good, do close out.
    2. If fault remains, continue with next step.

  2. Perform the detailed inspection of the fuel manifold.

    1. If the system checks are good, do close out.
    2. If fault remains, continue with next step.

  3. Perform the low pressure (LP) compressor (fan) trim balance procedure.

    1. If the system checks are good, do close out.
    2. If fault remains, continue with next step.

  4. Replace the fuel tube 20. Is the N1 VIB indication still present on the EICAS primary display?

    1. If NO, do close out.
    2. If YES, continue with next step.

  5. Check if the engine was shutdown in flight or the engine had shedding/ingestion of ice or the engine had bird strike or foreign object damage.

    1. If the engine had shedding/ingestion of ice, go to 7.
    2. If the engine had a bird strike or foreign object damage, go to step 8.
    3. If the engine was shutdown in flight, continue with next step.

  6. Perform the detailed inspection of the engine after inflight shutdown.

    1. If the system checks are good, do close out.
    2. If fault remains, go to step 9.

  7. Perform the detailed inspection of the engine after shedding/ingestion of ice.

    1. If the system checks are good, do close out.
    2. If fault remains, go to step 9.

  8. Perform the detailed inspection of the engine after bird strike.

    1. If the system checks are good, do close out.
    2. If fault remains, continue with next step.

  9. When the condition of the engine is satisfactory, perform a power assurance check.
  10. Make sure that the engine N1 VIB indication does not show on the EICAS primary display.
  11. Do close out.

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