04/20/21
Message Overview:
Message Name:
TR MULTIPLEXER 4
Message Code:
B3-303869
Associated CAS:
| Reporting LRU: | L ENG TR MUX |
| System Description: | 78-30-00 |
| Schematic Diagram: | None |
| Wiring Diagram: | None |
Message Description:
Left engine thrust reverser multiplexer fault 4.
[MCID 1421]
TR Multiplexer 4.
A fault in the thrust reverser multiplexer was sensed.
Possible Causes:
- MUX Assembly (W8)
- Wiring Harness (W3)
- Wiring Harness (W6)
- Thrust Reverser (TR) Interface Connector (W3)
- Thrust Reverser (TR) Interface Connector (W8)
- Wiring Harness (W9)
- Wiring Harness (W10)
- Wiring Harness (W11)
- Full Authority Digital Engine Control (FADEC) Electronic Control Unit A (ECU) (A41)
- Full Authority Digital Engine Control (FADEC) Electronic Control Unit B (ECU) (A43)
Troubleshooting Tips:
Advisory Wire/Service Bulletin: None
Forum Articles/Infoservice/Newsletter: None
Quick Links:
| Removal of the Engine Electronic Control Unit (ECU) | AMM 76-10-05-000-801 |
| Installation of the Engine Electronic Control Unit (ECU) | AMM 76-10-05-400-801 |
| Deactivation of the Thrust Reverser (For Maintenance) | AMM 78-30-00-040-801 |
| Activation of the Thrust Reverser (For Maintenance) | AMM 78-30-00-440-801 |
| Operational Test of the Thrust Reverser | AMM 78-30-00-710-801 |
| General Visual Inspection of the Thrust Reverser | AMM 78-30-00-210-802 |
| General Visual Inspection of the Thrust-Reverser Wiring Harness | AMM 78-33-00-210-801 |
| Removal of the Thrust-Reverser Harness (Multiplexer to Lower Deploy Switch and Electro-Hydraulic Primary Lock) | AMM 78-33-06-000-801 |
| Installation of the Thrust-Reverser Harness (Multiplexer to Lower Deploy Switch and Electro-Hydraulic Primary Lock) | AMM 78-33-06-400-801 |
| Removal of the Thrust-Reverser Harness (Multiplexer to Direction Control Unit and Upper Deploy Switches) | AMM 78-33-06-000-802 |
| Installation of the Thrust-Reverser Harness (Multiplexer to Direction Control Unit and Upper Deploy Switches) | AMM 78-33-06-400-802 |
| Removal of the Thrust-Reverser Harness (Multiplexer to Stow Switches) | AMM 78-33-06-000-803 |
| Installation of the Thrust-Reverser Harness (Multiplexer to Stow Switches) | AMM 78-33-06-400-803 |
| Removal of the Thrust-Reverser Harness (Multiplexer) | AMM 78-33-06-000-804 |
| Installation of the Thrust-Reverser Harness (Multiplexer) | AMM 78-33-06-400-804 |
| 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:
- MCID 1421 fault present, troubleshoot using the following steps for aircraft and engine fault isolation with reference to the Light Engine Maintenance Manual Subtask 72-00-00-810-255-A01.
