03/02/21
Message Overview:
Message Description:
No PSEU-B data received at SECU 2 and DCU CH. B is not reporting failure.
Possible Causes:
- Spoiler Electronic-Control Unit 2 (SECU 2) (A119)
- Right Input/Output Concentrator Unit (IOC) (A4-IOC2)
- Junction Box 2 (JB2)
- Proximity-Sensor Electronic Unit (PSEU) (A9)
- Integrated-Avionics Processor System (IAPS) Card Cage (ICC) (A4)
- Associated Wiring
Troubleshooting Tips:
Advisory Wire/Service Bulletin:
- AW300-27-0037 - Spoiler Electronic Control Unit (SECU) - Circuit Breaker Reset Procedure (20501 - 20999)
- AW300-27-0081 - Spoiler Electronic Control Unit (SECU) and Horizontal Stabilizer Electronic Control Unit (HSTECU) - Cold Temperature Circuit Breaker Reset Procedure (20501 - 20999)
Forum Articles/Infoservice/Newsletter: None
Data transmission path (PSEU to SECU 1).
PSEU-B data is transmitted from the PSEU CH. B via the ARINC 429 PSEU-B data bus to the Right IOC and to the DCU Ch. B. Then, from the R IOC via the ARINC 429 R-GP-5 data bus to the SECU 2.
Quick Links:
| Removal of the Junction Box JB4 | AMM 24-63-13-000-802 |
| Installation of the Junction Box JB4 | AMM 24-63-13-400-802 |
| Removal of the Junction Box JB4 Circuit-Cards | AMM 24-63-13-000-803 |
| Installation of the Junction Box JB4 Circuit-Cards | AMM 24-63-13-400-803 |
| Functional Test of Junction Box JB4 | AMM 24-63-13-720-801 |
| 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 27-61-05-820-802 |
| Operational Test of the Integrated-Avionics Processor System (IAPS) | AMM 31-45-00-710-801 |
| Removal of the Integrated-Avionics Processor System (IAPS) Card Cage (ICC) | AMM 31-45-01-000-801 |
| Installation of the Integrated-Avionics Processor System (IAPS) Card Cage (ICC) | AMM 31-45-01-400-801 |
| Removal of the Input/Output Concentrator Unit (IOC) | AMM 31-45-05-000-801 |
| Installation of the Input/Output Concentrator Unit (IOC) | AMM 31-45-05-400-801 |
| Operational Test of the Input/Output Concentrator Unit (IOC) | AMM 31-45-05-710-801 |
| Removal of the Proximity-Sensor Electronic Unit (PSEU) | AMM 32-61-09-000-801 |
| Installation of the Proximity-Sensor Electronic Unit (PSEU) | AMM 32-61-09-400-801 |
| Functional Test of the Proximity-Sensor Electronic Unit (PSEU) | AMM 32-61-09-720-801 |
| 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.
- Check in Current Fault and Fault History in the MDC for fault related to WOW / PSEU.
- If a fault is found in the MDC, go to this failure troubleshooting page first.
- If no faults are found, 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.
- If system checks are good, do close out.
- If fault remains, continue with next step.
NOTE: An Electronic Rigging of the SECUs is necessary after a swap or a SECU replacement.
- Swap IOCs.
- If system checks are good, do close out.
- If fault remains, continue with next step.
- Perform wiring checks of the ARINC 429 PSEU-B data bus from Junction Box 2 (Test Point 92 ARINC Hi / Test Point 95 ARINC Lo) to IAPS connector A4P1. Repair/replace as required.
- If system checks are good, do close out.
- If fault remains, continue with next step.
- Replace PSEU.
- If system checks are good, do close out.
- If fault remains, continue with next step.
- Replace IAPS Card Cage (ICC).
- Do close out.