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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 EHPL 4

Message Code:

B3-303818

Associated CAS:

L REVERSER FAIL
(Caution)

Reporting LRU: L ENG TR EHPL
System Description: 78-30-00
Schematic Diagram: None
Wiring Diagram: None

Message Description:

Left engine thrust reverser EHPL fault 4.

[MCID 1431]
TR EHPL 4.
An open in the EHPL or reverse balk circuitry was sensed.

Possible Causes:

  • Wiring Harness (W11)
  • Electro-Hydraulic Primary-Lock (EHPL)
  • Wiring Harness (W1)
  • Aircraft Wiring Harness
  • Throttle Quadrant Assembly (TQA) (A51)

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
Operational Test of the Pivot-Door Actuator Internal-Lock AMM 78-32-00-710-801
Operational Test of the Electro-Hydraulic Lock Assembly AMM 78-32-00-710-802
Detailed Inspection of the S Hook Assemblies AMM 78-32-00-220-801
Detailed Inspection of the Pivot Door Hooks AMM 78-32-00-220-802
Detailed Inspection of the Pivot Door Actuators and Attachment Hardware AMM 78-32-00-220-803
Detailed Inspection of the Electro-Hydraulic Lock Assembly AMM 78-32-00-220-804
Detailed Inspection of the Hydraulic Lock Assembly AMM 78-32-00-220-805
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
Removal of the Thrust-Reverser Pivot Doors Actuators AMM 78-32-02-000-801
Installation of the Thrust-Reverser Pivot Doors Actuators AMM 78-32-02-400-801
Removal of the Thrust-Reverser Hydraulic Primary-Lock AMM 78-32-05-000-801
Installation of the Thrust-Reverser Hydraulic Primary-Lock AMM 78-32-05-400-801
Removal of the Thrust-Reverser Electro-Hydraulic Primary-Lock AMM 78-32-06-000-801
Installation of the Thrust-Reverser Electro-Hydraulic Primary-Lock AMM 78-32-06-400-801
Functional Test of the Thrust-Reverser Electro-Hydraulic Primary-Lock AMM 78-32-06-720-801
Removal of the Thrust-Reverser Isolation Control-Unit (ICU) AMM 78-32-07-000-801
Installation of the Thrust-Reverser Isolation Control-Unit (ICU) AMM 78-32-07-400-801
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 1431 fault present, troubleshoot using the following steps for aircraft and engine fault isolation with reference to the Light Engine Maintenance Manual Subtask 72-00-00-810-263-A01.

Thrust Reverser Block

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