11/05/25
Message Overview:
Message Name:
L IB MF SPOILER
Message Code:
B3-007912
| Associated CAS: | SPOILERS FAULT (CAUTION) |
| Reporting LRU: | SPOILER ECU 1 |
| System Description: | 27-61-00 - Control and Indication System (Spoilers) 27-62-00 - Multifunction Spoilers 27-63-00 - Ground Spoilers |
| Schematic Diagram: | 27-61-00-101 - Flight-Spoiler Control and Indication System 27-62-00-101 - Multi-Function Spoiler 27-63-00-101 - Ground Spoiler |
| Wiring Diagram: | 27-61-09 - Flight-Spoiler Control Lever (ECU 1) - ALL 27-62-05 - Spoiler Electronic -Control Unit (SECU) 1 - ALL |
Message Description:
Left Inboard Multi-Function Spoiler fault detected by Spoiler Electronic-Control Unit #1 (SECU1).
Possible Causes:
- Spoiler Electronic-Control Unit 1 (SECU 1) (A118)
- Left Inboard Multi-Function Spoiler Power-Control Unit (MFS PCU) (MPE37)
- Rotary Variable Differential Transformer (RVDT) (MT145)
- Associated Wiring
Troubleshooting Tips:
Advisory Wire/Service Bulletin:
- AW300-27-0368 - Replacement of the Multifunction Spoiler Power Control unit (MFS PCU) - SB 100-27-17, SB 350-27-010
Full Throttle Blog/Forum Articles/Infoservice/Newsletter: None
Flight Operation Notifications Manual (FONM): None
Quick Links:
| Standard Aircraft Configuration for Maintenance | AMM 12-00-00-867-803 |
| Electrical/Electronic Safety Precautions | AMM 24-00-00-910-801 |
| Electrostatic-Discharge Safety Precautions | AMM 24-00-00-910-802 |
| Connect Electrical Power to the Aircraft | AMM 24-00-00-861-801 |
| 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 |
| Removal of the Spoiler Proximity Sensor | AMM 27-61-09-000-801 |
| Installation of the Spoiler Proximity Sensor | AMM 27-61-09-400-801 |
| Operational Test of the Ground Spoiler System | AMM 27-63-00-710-802 |
| Removal of the Ground-Spoiler Selector Valve | AMM 27-63-01-000-801 |
| Installation of the Ground-Spoiler Selector Valve | AMM 27-63-01-400-801 |
| Removal of the Ground Spoiler Actuator | AMM 27-63-05-000-802 |
| Installation of the Ground Spoiler Actuator | AMM 27-63-05-400-802 |
| Rigging of the Ground-Spoiler Control Surface | AMM 27-63-09-820-801 |
Troubleshooting Recommendations:
- Perform the 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 damaged/bent contacts.
- If defects are found, repair/replace as required and do close out.
- If no defects are found, continue with next step.
- Interchange SECU 1 with SECU 2. Is the fault still present?
- If YES, continue with next step.
- If NO, replace defective SECU.
NOTE: An Electronic Rigging of the SECUs is necessary after a swap or an SECU replacement.
- Perform a Rigging Check of the Multi-Function Spoiler Control-Surface.
- If check is good, go to step 6.
- If check is not good, continue with next step.
- Perform the Rigging of the Multi-Function Spoiler Control-Surface.
- If system checks are good, do close out.
- If fault remains, continue with next step.
- Perform a wiring checks between SECU 1 connector A118AP1 and the Left Inboard Multi-Function Spoiler Power-Control Unit connector MPE37P1.
From To Result A118AP1-9J MPE37P1-7 A118AP1-9K MPE37P1-8 A118AP1-3G MPE37P1-9 A118AP1-4F MPE37P1-10 A118AP1-3H MPE37P1-11 A118AP1-8K MPE37P1-12 A118AP1-8J MPE37P1-13 - If wiring defects are found, repair defective wiring as required and do close out.
- If no defects are found, continue with the next step.
- Do RVDT( MT145) resistance checks from the SECU 1 connector A118AP1 as follows:
From SECU 1 To SECU 1 Result (Ohms) A118AP1-3A A118AP1-4E A118AP1-3A A118AP1-3B A118AP1-4E A118AP1-3B A118AP1-8D A118AP1-8C - Are the result satisfactory?
- If YES, continue with the next step.
- If NO, replace the RVDT (MT145) and do the close out.
- Replace the Multi-Function Spoiler Power-Control Unit (PCU). You may interchange with another MFS PCU for fault confirmation (All Multi-Function Spoiler Power-Control Units are interchangeable).
- Do close out.