11/25/22
Message Overview:
Message Description:
The difference in angular position of the two RVDTs located on the flap lever trigger, LH & RH RVDT difference > 10°.
The RVDT voltage is checked, trigger, voltage out of range for > 30 milliseconds.
Possible Causes:
- Flap Lever (A120)
- Flap Control Unit (FCU) (A124)
- Associated Wiring
Troubleshooting Tips:
Advisory Wire/Service Bulletin: None
Forum Articles/Infoservice/Newsletter: None
Quick Links:
| Removal of the FLAP Lever | AMM 27-51-01-000-801 |
| Installation of the FLAP Lever | AMM 27-51-01-400-801 |
| 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 FCU breaker CB1 - B13 & B14 and CB2 - B12.
- If system checks are good, do close out.
- If fault remains, continue with next step.
- Reset FCU by pushing the FLAP RESET button on the Maintenance Test Control Panel.
- If system checks are good, do close out.
- If fault remains, continue with next step.
- Perform wiring checks between the flap lever A120 to the flap control unit. Repair as required.
- If system checks are good, do close out.
- If fault remains, continue with next step.
- Replace the flap control handle.
A. If the system checks are good, do the close out.
B. If the fault remains, continue with next step. - Replace the flap contol Unit (FCU).
- Do close out.
