03/02/21
Message Overview:
Message Description:
The spoiler deployed input is invalid, declared invalid by the SECU, or wiring fault. Verify SECU 1, SECU 2, and aircraft wiring.
Possible Causes:
- Spoiler Electronic-Control Unit 1 (SECU) (A118)
- Spoiler Electronic-Control Unit 2 (SECU) (A119)
- Stall Protection Computer (SPC) (A178)
- Associated Wiring
Troubleshooting Tips:
Advisory Wire/Service Bulletin: None
Forum Articles/Infoservice/Newsletter: None
NOTE: 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:
| Operational Test of the Stall Protection System (SPS) | AMM 27-32-00-710-801 |
| Removal of the Stall Protection Computer | AMM 27-32-01-000-801 |
| Installation of the Stall Protection Computer | AMM 27-32-01-400-801 |
| 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 |
| 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:
- In Maintenance Main Menu, select LRU INDEX/OPERATIONS and check Stall Protection Computer label 354.
- When either SECU Status Fail, SPC label 354 bit 15 is set to 1.
XXXX XXXX XXXX XXXX X1XX XX00 = SPC A = SECU 1 INTERFACE FAIL.
XXXX XXXX XXXX XXXX X1XX XX01 = SPC B = SECU 2 INTERFACE FAIL.
NOTE: Use SPC label 354 SDI (bit 10-9) to determine defective SPC. - Do wiring checks between SPC connector A178AP1 and SECU1 when SPC label 354 bit 15=1 and SDI is 00. Repair as required.
- If system check are good, do close out.
- If fault remains continue to next step.
- Do wiring checks between SPC connector A178BP1 and SECU2 when SPC label 354 bit 15=1 and SDI is 01. Repair as required.
- If system checks are good, do close out.
- If fault remains continue to next step.
- Replace SECU.
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 check are good, do close out.
- If fault remains continue to next step.
- Reset the following circuit breakers and perform the Pilot Activated Test (PAT) of the Stall Protection System on the Systems Test control-panel located on the center pedestal.
STALL L PWR CB1-B10 STALL R PWR CB2-B10 - If system checks are good, do close out.
- If fault remains, continue with next step.
- Replace SPC.
- If system checks are good, do close out.
- If fault remains continue to next step.
- Do close out.