03/08/21
Message Overview:
Message Name:
APU LOOP B/WRG/FIDEEX CONTROL UNIT
Message Code:
2610010WK
Associated CAS:
| Reporting LRU: | Fire Detection and Extinguishing Control Unit (FIDEEX CU) |
| System Description: | 26-21-00 |
| Schematic Diagram: | 26-21-00 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Wiring Diagram: | 26-10-02 [ Global Express ] [ G5000 ] [ Global XRS ] |
Message Description:
Fire Detection and Extinguishing Control Unit (FIDEEX CU) detected a failure in the Auxiliary Power Unit (APU) loop B.
Possible Causes:
- Auxiliary Power Unit (APU) Loop B Sensing Elements
- Fire Detection and Extinguishing Control Unit (FIDEEX CU) (A106)
- 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 A/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:
- Allow aircraft to cool to the ambient temperature before you do the fault isolation.
- 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.
- If system checks are good, do close out.
- If fault remains, continue with next step.
- Perform wiring checks between FIDEEX (A106P2) and connector (J801).
- If wiring checks are not good, repair defective wiring as required and do close out.
- If wiring checks are good, continue with next step.
- Perform wiring checks within APU as follow:
From To Result P800-A P800-B - If wiring checks are not good, repair defective wiring as required and do close out.
- If wiring checks are good, continue with next step.
- 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 - If wiring checks are not good, repair defective wiring as required and do close out.
- If wiring checks are good, continue with next step.
- Replace FIDEEX CU.
- Do close out.