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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 DCU 4

Message Code:

B3-303797

Associated CAS:

None

Reporting LRU: L ENG TR DCU
System Description: 78-30-00
Schematic Diagram: 31-41-00
78-30-00
Wiring Diagram: 31-41-13
78-32-09



Message Description:

Left engine thrust reverser DCU fault 4.

[MCID 1435]
TR Directional Control Unit 4.
A short to ground fault in the harness between the TR directional control unit and the ECU A or the ECU B was sensed.

Possible Causes:

  • Wiring Harness (W6)
  • Wiring Harness (W3)
  • Wiring Harness (W10)
  • Multiplexer Assembly (W8)
  • Directional Control Unit (DCU) Solenoid
  • 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 FADEC Electrical Harness from the Left Engine AMM 71-50-05-000-802
Installation of the FADEC Electrical Harness on the Left Engine AMM 71-50-05-400-802
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
Removal of the Thrust-Reverser Directional Control-Unit AMM 78-32-01-000-801
Installation of the Thrust-Reverser Directional Control-Unit AMM 78-32-01-400-801
General Visual Inspection of the Thrust-Reverser Wiring Harness AMM 78-33-00-210-801
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 1435 fault present, troubleshoot using the following steps for aircraft and engine fault isolation with reference to the Light Engine Maintenance Manual Subtask 72-00-00-810-266-A01.

Thrust Reverser Block

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