02/26/21
Message Overview:
Message Description:
Spoiler Electronic Control Unit 2 (SECU2) input fault detected by Horizontal Stabilizer Electronic Control Unit (HST ECU). This logic will set a STAB TRIM FAULT if one of the HSTECM-1 or HSTECM-2.
Possible Causes:
- Horizontal-Stabilizer-Trim Electronic-Control Unit (HST ECU) (A130)
- Spoiler Electronic-Control Unit 2 (SECU) (A119)
- Right Input/Output Concentrator (IOC) (A4-IOC2)
- Associated Wiring
Troubleshooting Tips:
Advisory Wire/Service Bulletin:
- AW300-27-0081 - Spoiler Electronic Control Unit (SECU) and Horizontal Stabilizer Electronic Control Unit (HSTECU) - Cold Temperature Circuit Breaker Reset Procedure
- AW300-27-0302 - SPOILERS FAULT EICAS Message Caused by TQA Idle Switch
Forum Articles/Infoservice/Newsletter:
- Perform the AW300-27-0081 reset procedure for the HSTECU if the message is displayed during initial power-up in cold temperature. The stab trim position indication on EICAS can also flash on and off as a result of this condition.
- If the aircraft is powered up with > 8° of aileron, the STAB TRIM FAULT will post. This can be verified by putting on hydraulics and looking at the spoiler synoptic page. Typically the outboard spoiler the yoke is tilted towards will go amber after self-test. Center the yoke and re-power-up the aircraft.
Quick Links:
| Electrical Rigging of the Pitch Trim System | AMM 27-41-00-820-801 |
| Rigging Check of the Pitch Trim System | AMM 27-41-00-220-801 |
| Removal of the Horizontal-Stabilizer-Trim Electronic-Control Unit (HST ECU) | AMM 27-41-21-000-801 |
| Installation of the Horizontal-Stabilizer-Trim Electronic-Control Unit (HST ECU) | AMM 27-41-21-400-801 |
| Operational Test of the Horizontal-Stabilizer-Trim Electronic-Control Unit (HST ECU) | AMM 27-41-21-710-801 |
| 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:
- Select the flight controls synoptic page and look for magenta or amber spoiler position indications. #2 SECU reports outboard Multi Function and Ground Spoiler Information. This verifies the system is not seeing the spoiler information.
- Pull the #2 SECU breaker CB2 - B9, reset after a couple seconds. This will initiate the Power-On BIT test or PBIT. Some clunking will be heard on the wing during this test, the SPOILER FAULT cyan CAS will post and that CAS will clear along with the STAB TRIM FAULT.
- If the STAB TRIM FAULT message with the B3-006880 MDC fault and a spoiler message are posted, continue by following the troubleshooting steps associated with the MDC equation of that spoiler message.
- Perform a wiring check (data bus) between SECUs, HST ECU, JB1 and JB2.
- If wiring defects are found, repair defective wiring as required and do close out.
- If no defects are found, continue with next step.
- Swap SECUs (Spoiler system must be rigged after SECU replacement). Is the fault still present?
- If YES, continue with next step.
- If NO, replace defective SECU.
- Replace HST ECU.
- Do close out.