03/02/21
Message Overview:
Message Description:
No R-SECU-1 data received at DCU (from SECU 2).
Possible Causes:
- Spoiler Electronic-Control Unit (SECU) No.2 (A119)
- Data Concentrator Unit (DCU) (A14)
- Associated Wiring
Troubleshooting Tips:
Advisory Wire/Service Bulletin:
- AW300-27-0037 - Spoiler Electronic Control Unit (SECU) - Circuit Breaker Reset Procedure (20501 - 20999)
Forum Articles/Infoservice/Newsletter: None
- Reset SECU1 circuit breaker 'SPOILER CTRL 1' CBP1-B9 if any of the inboard MFS and GS #2, #4, #5 and #7 surface indication are amber or magenta.
- Reset SECU2 circuit breaker 'SPOILER CTRL 2' CBP2-B9 if any of the inboard MFS and GS #1, #3, #6 and #8 surface indication are amber or magenta.
NOTE 1: It is not permissible to cycle the SECU 1 or 2 circuit breakers in the air.
NOTE 2: If CAS messages SPOILERS FAULT (Caution), SPOILERS FAULT (Advisory) and STAB TRIM FAULT (Advisory) are all displayed at the same time on the EICAS momentarily for few seconds (between 3 to 20 seconds) and possibly MDC messages B3-007899 XTALK ARINC BUS [SPOILER ECU 1] or B3-007932 XTALK ARINC BUS [SPOILER ECU 2], B3-007882NO L-SECU-1 BUS TO DCU [SPOILER ECU 1], B3-007915NO R-SECU-1 BUS TO DCU [SPOILER ECU 2] and B3-007969 INVALID SECU INPUT [STALL COMPUTER] displayed together in the fault message history at the time of failure, download and send both SECU NVM files to the Bombardier Customer Response Center (CRC) for analysis.
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 Data Concentrator Unit (DCU) | AMM 31-41-01-000-802 |
| Installation of the Data Concentrator Unit (DCU) | AMM 31-41-01-400-802 |
| 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:
- Visually inspect the back of the box for pin damage or in the rack. If damaged, repair pin.
- Swap SECU 1 with SECU 2. If problem follows, replace SECU 2.
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). - Check wiring from DCU to SECU 2. If damaged, repair wiring.
- Replace DCU.
- Do close out.
