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(WARNING)
RED MESSAGE (CAUTION)
AMBER MESSAGE (ADVISORY)
CYAN MESSAGE (STATUS)
WHITE MESSAGE Require immediate crew attention. These messages are accompanied by flashing master warning, triple chime attenson with or without voice message or dedicated tone. Require immediate crew awareness and future crew action may be required in the form of alternate system selection or performance limitation. These message are accompanied by flashing master caution and a single chime. Indicate safe or normal system operation which require crew awareness, over and above the dark cockpit philosophy. Indicate minor failures or reduction in systems capability, which require no crew action.

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04/20/21

Message Overview:

Message Name:

TR MULTIPLEXER 1B

Message Code:

B3-303874

Associated CAS:

None

Reporting LRU: R ENG TR MUX
System Description: 78-30-00
Schematic Diagram: None
Wiring Diagram: None

Message Description:

Right engine thrust reverser multiplexer fault 1B.

[MCID 1420]
TR MUX 1B.
Display of this MDC message is a No Dispatch fault or a Long-time dispatch fault. Check the EICAS display for confirmation. A fault in the thrust reverser harness between the thrust reverser door position indication switches and the ECU B was sensed.

Possible Causes:

  • Wiring Harness (W3)
  • Wiring Harness (W6)
  • Thrust Reverser (TR) Interface Connector (W3)
  • Thrust Reverser (TR) Interface Connector (W8)
  • MUX Assembly (W8)
  • Wiring Harness (W9)
  • Wiring Harness (W10)
  • Wiring Harness (W11)
  • Full Authority Digital Engine Control (FADEC) Electronic Control Unit B (ECU) (A42)
  • Upper Deploy Switch
  • Lower Deploy Switch
  • Stow Switch

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:

  1. MCID 1420 fault present, troubleshoot using the following steps for aircraft and engine fault isolation with reference to the Light Engine Maintenance Manual Subtask 72-00-00-810-254-A01.

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