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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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04/21/21

Message Overview:

Message Name:

TR U DEPLOY SWITCH 1B

Message Code:

B3-305020

Associated CAS:

None

Reporting LRU: L TR U DEPLOY SW
System Description: 78-30-00
Schematic Diagram: 78-30-00
Wiring Diagram: None

Message Description:

Left engine thrust reverser upper deploy switch fault 1B.

[MCID 1414]
TR Upper Deploy Switch 1B.
A fault in the TR upper deploy switch harness between the upper deploy switch and the ECU B was sensed.

Possible Causes:

  • Wiring Harness (W10)
  • Thrust Reverser (TR) Interface Connector (W3)
  • Thrust Reverser (TR) Interface Connector (W8)
  • MUX assembly (W8)
  • Wiring Harness (W3)
  • Wiring Harness (W6)
  • Upper Deploy Switch
  • Full Authority Digital Engine Control Unit (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
General Visual Inspection of the Thrust-Reverser Wiring Harness AMM 78-33-00-210-801
Removal of the Thrust-Reverser Door Deploy-Switch AMM 78-33-01-000-801
Installation of the Thrust-Reverser Door Deploy-Switch AMM 78-33-01-400-801
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 1414 fault present, troubleshoot using the following steps for aircraft and engine fault isolation with reference to the Light Engine Maintenance Manual TASK 72-00-00-810-243.

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