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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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Quick Links

04/21/21

Message Overview:

Message Name:

TR TEST SWITCH 1A

Message Code:

B3-304278

Associated CAS:

None

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

Message Description:

Right engine thrust reverser test switch fault 1A.

[MCID 1453]
TR Test Switch 1A.
A fault in the TR ground test switch harness, between the TR ground test switch and the ECU A, was sensed.

WARNING: If MCID 1453, 1454, or 1455 is present inadvertent deployment of the thrust reverser may occur causing serious injury or death to personnel.

Possible Causes:

  • Wiring Harness (W6)
  • Full Authority Digital Engine Control Unit (FADEC) Electronic Control Unit B (ECU) (A40)

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) 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 1453 fault present, troubleshoot using the following steps for aircraft and engine fault isolation with reference to the Light Engine Maintenance Manual Subtask 72-00-00-810-284-A01.

Thrust Reverser Block

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