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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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Quick Links

12/09/25

Message Overview:

Message Name:

L MLG WELL LOOP /WRG/FIDEEX CU

Message Code:

2610013WK

Associated CAS:

MLG BAY OVHT FAIL
(Caution)

Reporting LRU: Fire Detection and Extinguishing Control Unit (FIDEEX CU)
System Description: 26-13-00 - Main Landing Gear Overheat Detection System
Schematic Diagram: [ Global Express ]  [ G5000 ]  [ Global XRS ] - SSM 26-11-00-101 - Fire Detection Loops System - Electrical Schematic
Wiring Diagram: [ Global Express ]  [ G5000 ]  [ Global XRS ] - WM 26-10-02 - Sheet 2 - Fire Detection Loops 

Message Description:

This message shows when a failure in the left Main Landing Gear (MLG) wheel well overheat sensing loop is detected.

Possible Causes:

  • Left Main Landing Gear (MLG) Overheat Sensing Element
  • Fire Detection and Extinguishing Control Unit (FIDEEX CU) (A106)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

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

Flight Operation Notifications Manual (FONM): None

Quick Links:

Removal of the Fire-Detection-and-Extinguishing (FIDEEX) Control-Unit AMM 26-10-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Fire-Detection-and-Extinguishing (FIDEEX) Control-Unit AMM 26-10-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Main Landing Gear (MLG) Sensing Element AMM 26-13-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Main Landing Gear (MLG) Sensing Element AMM 26-13-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. Allow aircraft to cool to the ambient temperature before you do the fault isolation.
  2. Perform a visual inspection of left MLG sensing element and grommets: make sure elements are not bent or in contact with other element. Check also for damaged connector.Repair or align as required.

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

  3. Perform a resistance check of left MLG overheat sensing elements (between terminal lug and element) as follows:

    Resistance at ambient temperatures
    65 °F/18 °C 55.06 MOhms
    70 °F/21 °C 48.22 MOhms
    75 °F/24 °C 42.23 MOhms
    80 °F/27 °C 36.99 MOhms
    85 °F/29 °C 32.39 MOhms
    90 °F/32 °C 28.37 MOhms
    95 °F/35 °C 24.85 MOhms
    100 °F/38 °C 21.76 MOhms

    1. If resistance is within tolerance, go to step 5.
    2. If resistance is out of tolerance, continue with next step.

  4. Replace defective MLG sensing element.

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

  5. Perform wiring checks between FIDEEX CU (A106P1) and Left Main Wheel Well Element (E46).

    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.

  6. Replace FIDEEX CU.
  7. Do close out.

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