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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 TQA 1B

Message Code:

B3-304662

Associated CAS:

None

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

Message Description:

Right engine thrust reverser TQA fault 1B.

[MCID 1457]
TR TQA 1B.
An open circuit fault in the TQA solenoid wiring between the TQA solenoid pylon junctions and the ECU B, or the ECU B was sensed.

Possible Causes:

  • A short in the Harness between the Throttle Quadrant Assembly (TQA) Pylon Junctions and the ECU B
  • Forward Balk Solenoids in the Throttle Quadrant Assembly (TQA)
  • Reverse Balk Solenoids in the Throttle Quadrant Assembly (TQA)
  • Full Authority Digital Engine Control (FADEC) Electronic Control Unit B (ECU) (A42)

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Throttle Quadrant AMM 76-10-01-000-801
Installation of the Throttle Quadrant AMM 76-10-01-400-801
Operational Test of the Throttle Quadrant AMM 76-10-01-710-801
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
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 1457 fault present, troubleshoot using the following steps for aircraft and engine fault isolation with reference to the Light Engine Maintenance Manual TASK 72-00-00-810-283.

Thrust Reverser Block wd

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