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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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08/20/19

Message Overview:

L REVERSER FAULT
(Advisory)

DDG Reference: 78-31-01
Pilot Action (QRH): ADVISORY 1-4
System Description: 78-30-00
Schematic Diagram: None
Wiring Diagram: None

Fault Description:

THRUST REVERSER (TR) ISOLATION CONTROL UNIT (ICU), ISOLATION VALVE (IV) PRESSURE OUTPUT DISAGREES WITH THE ICU COMMAND.
Hydraulic Pressure Switch and Isolation Valve Fault Detection logic:

  1. Both hydraulic pressure switch signals inside the ICU are compared with TR Isolation Valve command. If the two switch contacts agree but disagree with the IV command then an isolation valve failure shall be flagged.
  2. If both hydraulic pressure switch contacts, in one ICU disagree with each other, then a switch fault is assumed.
  3. If IV solenoid is energized and both hydraulic pressure switch contacts indicate low pressure, but the doors still operate (LVTs indicating change from stowed to unstowed at 14% door open position or vice versa) then a failure of the pressure switches shall be assumed.

Possible Causes:

  • Hydraulic System contamination
  • Isolation Control Unit (ICU)
  • L Engine Electronic Controller (EEC)
  • Wiring between Isolation Control Unit (ICU) and L Engine Electronic Controller (EEC)

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Opening of the Cowls AMM 71-10-00-010-801  [ Global Express ]  [ G5000 ]  [ Global XRS ]
Closing of the Cowls AMM 71-10-00-410-801  [ Global Express ]  [ G5000 ]  [ Global XRS ]
Deactivation of the Thrust Reverser (for Maintenance) AMM 78-30-00-040-801  [ Global Express ]  [ G5000 ]  [ Global XRS ]
Activation of the Thrust Reverser (for Maintenance) AMM 78-30-00-440-801  [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Isolation Control Unit AMM 78-33-01-000-801  [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Isolation Control Unit AMM 78-33-01-401-801  [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: WM 71-50-00  [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wire Repair SPM 20-12-10  [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Engine Electronic Controller (EEC) Mod 73-101559 EMM 73-21-01-000-801-B00
Installation of the Engine Electronic Controller (EEC) Mod 73-101559 EMM 73-21-01-400-801-B001

Troubleshooting Recommendations:

  1. Select related CAIMS message below:

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