02/26/21
Message Overview:
Message Description:
No Flap Control Unit (FCU) ARINC Signal at Remote Data Concentrator (RDC) and Stall protection Computer (SPC). Check power, circuit breakers and FCU (If FCU is replaced, flaps must be rigged).
Possible Causes:
- Flap Control Unit (FCU) (A124)
- Associated Wiring
Troubleshooting Tips:
Advisory Wire/Service Bulletin:
- AW300-27-0058 - Flap Control Unit - CAS Messages Reset procedure (20501 - 20999)
Forum Articles/Infoservice/Newsletter: None
In the MDC system parameters, an FPU PRESS XDCR SIGNAL showing 3740 PSI indicates the FCU have detected a malfunction in the system and do not send the excitation signal to the FPU pressure transducer.
MDC REPORT: SYSTEM PARAMETERS
FILENAME:
DATE:
...
FLAP SURFACE ANGLE - 3.74 DEG
FPU PRESS XDCR SIGNAL - 3740 PSI
APU HOURS - 1116.75 HRS
…
Source of the problem still has to be found.
Quick Links:
| Removal of the Flap Control Unit (FCU) | AMM 27-51-05-000-801 |
| Installation of the Flap Control Unit (FCU) | AMM 27-51-05-400-801 |
| Operational Test of the Flap Control Unit (FCU) | AMM 27-51-05-710-801 |
| Wiring - Maintenance Practices - ALL | SPM 20-12-00-02 |
| Wire Repair - Maintenance Practices - ALL | SPM 20-12-10-02 |
| Electrical Connectors - Maintenance Practice - ALL | SPM 20-20-00-02 |
Troubleshooting Recommendations:
- Reset the following circuit breakers.
- If system checks are good, do close out.
- If fault remains, continue with next step.
FLAP R IND CB2-B12 FLAP L IND CB1-B13 FLAP CTRL CB1-B14 - Reset the FCU by pressing the FCU reset button on the MAINTENANCE TEST control-panel. If unable to reset, engage the Alternate Flaps button with the left hydraulic system pressurized, and attempt another reset using the Flap Reset switch on the left galley.
- If system checks are good, do close out.
- If fault remains, continue with next step.
- If fault remains, replace FCU per AMM.
- Do close out.