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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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11/11/24

Message Overview:

Message Name:

FADEC [OIL LEVEL SENSOR CIRCUIT]

Message Code:

4960231APU

Associated CAS:

None

Reporting LRU: Auxiliary Power Unit (APU) Full-Authority Digital Engine-Controller (FADEC)
System Description: 49-90-00 - APU Oil System
Schematic Diagram: 49-61-00-101 - APU Automatic Control System [ Global Express ]  [ Global XRS ]  [ Global 5000 ]
Wiring Diagram: 49-12-01 - Sheet 1 Harness - ALL [ Global Express ]  [ Global XRS ]  [ Global 5000 ]
49-61-00-01 - FADEC Interface - 9002-9129 [ Global Express ]  [ Global XRS ]  [ Global 5000 ]
49-61-00-02 - FADEC Interface - 9130-9158 [ Global Express ]  [ Global XRS ]  [ Global 5000 ]
49-61-02-1 - FADEC Interface - 9159-9413 [ Global Express ] [ Global XRS ] [ Global 5000 ]
49-61-02-2 - FADEC Interface - 9414-9431 [ Global Express ] [ Global XRS ] [ Global 5000 ]
49-61-02-1 - FADEC Interface - 9127-9413 [ Global Express ] [ Global XRS ] [ Global 5000 ]
49-61-02-2 - FADEC Interface - 9414-9431, 9998 [ Global Express ] [ Global XRS ] [ Global 5000 ]

Message Description:

Auxiliary Power Unit (APU) Oil Synoptic Display indicates invalid data.

Possible Causes:

  • Auxiliary Power Unit (APU) Full Authority Digital Engine Controller (FADEC) (A108)
  • Oil Level Sensor (MT2)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

NOTE:
If APU FADEC label 365 is valid and quantity sensors faults are present any Label 365 bit between 19 and 24 set equal to 1, then APU Oil quantity display shall be replaced by magenta dashes.

Quick Links:

Standard Aircraft Configuration for Maintenance [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM12-00-00-867-801
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
CAIMS PMAT General Instructions [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM45-45-00-970-801
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
Removal of the Full-Authority Digital Engine-Controller (FADEC) [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM49-61-01-000-801
Installation of the Full-Authority Digital Engine-Controller (FADEC) [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM49-61-01-400-801
Removal of the Oil Level Sensor [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM49-90-05-000-801
Installation of the Oil Level Sensor [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM49-90-05-400-801

Troubleshooting Recommendations:

  1. Perform wiring check on Oil Level Sensor receptacle MT2 as follows:

    From To Expected Result Result
    MT2J1-B MT2J1-E 26.2-30.2 Ohms
    MT2J1-H MT2J1-E 26.2-30.2 Ohms
    MT2J1-B Ground Shell >1 M Ohm
    MT2J1-E Ground Shell >1 M Ohm
    MT2J1-H Ground Shell >1 M Ohm
    MT2J1-B MT2J1-H >1 M Ohm

    1. If wiring checks are not good, repair defective wiring as required and do close out.
    2. If resistance is out of range, go to step 5.
    3. If wiring checks are good, continue with next step.

  2. Perform wiring check between APU FADEC (A108BP1) connector and the Oil Level Sensor (MT2P1) connector.

    1. If wiring checks are not good, repair defective wiring as required and do close out.
    2. If wiring checks are good, continue with next step.

  3. Perform wiring check between APU (P1) connector and Oil Level Sensor connector (MT2P1). Continuity between the ground shell and pins should be greater than 1 M Ohm.

    1. If wiring checks are not good, repair defective wiring as required and do close out.
    2. If wiring checks are good, continue with next step.

  4. Perform wiring check between aircraft wiring harness (J802) and FADEC (A108BP1) connectors. Continuity between ground shell and pins should be greater than 1 M Ohm.

    1. If wiring checks are not good, repair defective wiring as required and do close out.
    2. If wiring checks are good, continue with next step.

  5. Replace Oil Level Sensor.

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

  6. Replace APU FADEC.
  7. Do close out.

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