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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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03/08/21

Message Overview:

Message Name:

APU LOOP A /WRG/FIDEEX CONTROL UNIT

Message Code:

261000FWK

Associated CAS:

APU FIRE FAIL
(Caution)

APU FIRE FAULT
(Advisory)

Reporting LRU: Fire Detection and Extinguishing (FIDEEX) Control Unit
System Description: 26-21-00
Schematic Diagram: 26-11-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 26-10-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Message Description:

Fire Detection and Extinguishing (FIDEEX) Control Unit detected a failure in the Auxiliary Power Unit (APU) loop A circuit.

Possible Causes:

  • Auxiliary Power Unit (APU) Loop A Sensing Elements
  • Fire Detection and Extinguishing Control Unit (FIDEEX CU)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Notice To Operators (NTO): None

Flight Operation Notifications Manual (FONM): None

NOTE: The APU FIRE FAIL is displayed when a failure is detected in both Loop A and Loop B. The APU LOOP B/WRG/FIDEEX CONTROL UNIT CAIMS message is also displayed.

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 Eductor Sensing Elements AMM 26-12-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Eductor Sensing Elements AMM 26-12-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Hatch Sensing Elements AMM 26-12-05-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Hatch Sensing Elements AMM 26-12-05-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Strut Sensing Elements AMM 26-12-09-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Strut Sensing Elements AMM 26-12-09-400-801 [ 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 sensing element (Hatch 1/ Eductor 2/ Strut 3): make sure elements are not bent or in contact with other element. Check also for damaged connector.

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

  3. Perform wiring check between FIDEEX (A106P1) and connector (J800).

    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 (continuity of wire) between connector as follow:

    From To Result
    P800-A P800-B

    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. Perform wiring check between each terminal lug and each sensing element (Hatch 1/ Eductor 2/ Strut 3):

    From To Result
    P800-A P800-B

    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. Perform wiring checks between each terminal lug and each sensing element (Hatch 1/Eductor 2/Strut 3):

    Resistance at ambient temperatures for hatch element
    65°F/18°C 70°F/21°C 75°F/24°C 80°F/27°C 85°F/29°C 90°F/32°C 95°F/35°C 100°F/38°C
    0.208 MΩ 0.180 MΩ 0.157 MΩ 0.136 MΩ 0.118 MΩ 0.102 MΩ 89.00 kΩ 77.28 kΩ
    Resistance at ambient temperatures for eductor element
    65°F/18°C 70°F/21°C 75°F/24°C 80°F/27°C 85°F/29°C 90°F/32°C 95°F/35°C 100°F/38°C
    9.766 MΩ 8.356 MΩ 7.149 MΩ 6.117 MΩ 5.234 MΩ 4.478 MΩ 3.831 MΩ 3.278 MΩ
    Resistance at ambient temperatures for strut element
    65°F/18°C 70°F/21°C 75°F/24°C 80°F/27°C 85°F/29°C 90°F/32°C 95°F/35°C 100°F/38°C
    0.132 MΩ 0.117 MΩ 0.104 MΩ 91.77 kΩ 81.32 kΩ 72.05 kΩ 63.84 kΩ 56.57 kΩ

    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.

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

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