L REV LOCK FAIL

08/19/19

Message Overview:

L REV LOCK FAIL
(Caution)

DDG Reference:	78-31-01
Pilot Action (QRH):	ENG 05-19
System Description:	78-30-00
Schematic Diagram:	78-34-00 [ Global Express ] [ G5000 ] [ Global XRS ]
Wiring Diagram:	78-33-01 [ Global Express ] [ G5000 ] [ Global XRS ]

Fault Description:

Tertiary lock or left primary locks are unlocked with the thrust reverser pivoting doors in the stowed position.

NOTE: Thrust reverser is commanded STOW, doors are not in transit or deployed, tertiary lock switch is unlocked or door stow switches are in deployed status.

Possible Causes:

Tertiary Lock
Primary Lock Actuator / Mechanism

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Roll Royce NTO 66: - TRU - Binding Primary Door Lock Mechanism + Roll Royce NTO 135 - Issue of repeat technical variance 11595R (T/R Stow Switch)

CAIMS System Diagnostic LRU Test page for the DAU Discrete Inputs can be used to read the following Thrust Reverser discrete inputs:

TRA T/R Deploy switches
T/R Tertiary lock position switches
T/R upper and lower door solenoid status
T/R DCV valve solenoid status

Quick Links:

Visual Check of the Thrust Reverser	AMM 78-30-00-210-807 [ Global Express ] [ G5000 ] [ Global XRS ]
Manual Opening of the Pivoting Doors	AMM 78-31-01-010-801 [ Global Express ] [ G5000 ] [ Global XRS ]
Manual Closing of the Pivoting Doors	AMM 78-31-01-410-801 [ Global Express ] [ G5000 ] [ Global XRS ]
Schematic Diagram 78-33-00	SSM 78-33-00 [ Global Express ] [ G5000 ] [ Global XRS ]
Removal of the Primary Lock Actuator and Mechanism	EMM 78-33-04-000-801
Installation of the Primary Lock Actuator and Mechanism	EMM 78-33-04-400-801
Removal of the Tertiary Lock	EMM 78-33-05-000-801
Installation of the Tertiary Lock	EMM 78-33-05-400-801
General Visual Inspection of the Tertiary Lock	EMM 78-33-05-210-801

Troubleshooting Recommendations:

Manually open the pivoting doors and inspect for distortion, debris or damage.
1. If an abnormal condition is found, apply corrective action and do close out.
2. If inspection is good, continue with next step.
Inspect left and right primary lock actuator and mechanism for damage.
1. If damage is found, apply corrective action and do close out.
2. If no damage is found, continue with next step.
Inspect tertiary lock for damage. Inspect the tertiary lock spring, making sure that it is in place in its groove, not broken or not twisted out of place. See image below.
1. If damage is found, apply corrective action and do close out.
2. If no damage is found, continue with next step.
Swap left and/or right primary lock actuator with lock actuators on opposite thrust reverser assembly.
1. If fault follows, replace the defective lock actuator.
2. If fault remains, continue with next step.
Swap upper and/or lower tertiary lock with tertiary locks on opposite thrust reverser assembly to confirm the fault and replace defective tertiary lock.
Do close out.