02/26/21
Message Overview:
Message Description:
The Spoiler Electronic Control Unit 2 (SECU2) has detected a Left Outboard LVDT 1 out of range.
Possible Causes:
- Left Outboard Multi-Function Power-Control Unit (MFS PCU) 1 (MPE39)
- Spoiler Electronic-Control Unit 2 (SECU 2) (A119)
- Associated Wiring
Troubleshooting Tips:
Advisory Wire/Service Bulletin:
- AW300-27-0037 - Spoiler Electronic Control Unit (SECU) - Circuit Breaker Reset Procedure
- AW300-27-0368 - Replacement of the Multifunction Spoiler Power Control unit (MFS PCU) - SB 100-27-17, SB 350-27-010
Forum Articles/Infoservice/Newsletter: None
NOTE: During wiring checks reference BD-100 Schematic Manual 27-62-00 page 2 to aid in the ring-out. All MFS Actuators will have similar measurements for comparison if anomalies are noted during ring-out.
| MF Spoiler Components | MFS PCU Pins | Values |
| Primary Coil (Vp) | 12 - 13 | 50-2000Ω |
| Secondary Coil (Va) | 9 - 10 | 50-1000Ω |
| Secondary Coil (Vb) | 10 - 11 | 50-1000Ω |
| Electro Hydro Valve R1 | 7 - 8 | 435-525Ω |
Quick Links:
| Removal of the Spoiler Electronic-Control Unit (SECU) | AMM 27-61-05-000-801 |
| Installation of the Spoiler Electronic-Control Unit (SECU) | AMM 27-61-05-400-801 |
| Electronic Rigging of the Spoiler Electronic-Control Unit (SECU) | AMM 27-61-05-820-801 |
| Electronic Rigging of the Spoiler Electronic-Control Unit (SECU) | AMM 27-61-05-820-802 |
| Removal of the Multi-Function Spoiler Power-Control Unit (MFS PCU) | AMM 27-62-01-000-801 |
| Installation of the Multi-Function Spoiler Power-Control Unit (MFS PCU) | AMM 27-62-01-400-801 |
| 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:
- Follow the circuit breakers reset procedure documented in AW300-27-0037.
- If system checks are good, do close out.
- If fault remains, continue with next step.
- Do Electronic Rigging of the Spoiler Electronic-Control Unit.
- If system checks are good, do close out.
- If fault remains, continue with next step.
- Visually inspect SECU's and tray's connectors for damages. Repair/replace as required.
- If system checks are good, do close out.
- If fault remains, continue with next step.
- Swap SECUs.
NOTE: Perform electronic rigging of both SECUs when either SECU is swapped or replaced. The intent is if a SECU that is being installed was previously rigged in a different location in the same aircraft or it is being installed in a different aircraft or the SECU is a spare part it requires electronic rigging (AMM 27-61-05-820-802) per the instructions in AMM TASK 27-61-05-400-801 Installation of the Spoiler Electronic-Control Unit (SECU).
- If system checks are good, do close out.
- If fault remains, continue with next step.
- Do wiring checks between SECU 2 connector A119AP1 and Left outboard MFS PCU connector MPE39P1. Repair/replace as required.
- If system checks are good, do close out.
- If fault remains, continue with next step.
- Swap MFS PCUs.
NOTE:- An Electronic Rigging of the SECUs is necessary after a MFS PCU swap/replacement.
- Suspected MFS PCU wiring can be ringed-out and compared (values above are approximated) with another MFS PCU known to be functional.
- Do close out.