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A spring moves the isolation/power centering valve to the OFF position. This removes power from the EHSV and supplies pressure to both sides of the actuator. A return port in the center of the actuator (hole-in-the-wall) reduces pressure in the side of the actuator that is opposite to the actuator position. This moves and keeps the actuator in the centered position.
The spring-loaded lock collar locks the actuator after the pressure unlock solenoid removes the hydraulic pressure.
System faults will also disarm the main gear steering system.
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MAIN GEAR STEERING SYSTEM -HYDRAULIC FUNCTIONAL DESCRIPTION

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MAIN GEAR STEERING SYSTEM -INDICATIONS

Alert and Status Messages
The CONFIG GEAR STEERING warning message shows when a steering/locking PCA is not locked during takeoff.
The MAIN GEAR STEERING advisory message shows if a main gear steering/locking PCA is commanded locked and is not locked.
The MAIN GEAR STEERING status message shows if there is a failure in a component in the main gear steering system or if a steering/locking PCA is disabled.
Maintenance Page Indications
The multi-function display (MFD) shows steering tiller position on the landing gear brake and steering maintenance page. The angle of the main gear aft axles and locked/unlocked status also show on this display.
The page also shows failure or disable (manual shutoff valve closed) conditions below the aft axle angle display.
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777 AIRCRAFT MAINTENANCE MANUAL

MAIN GEAR STEERING SYSTEM -INDICATIONS

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777 AIRCRAFT MAINTENANCE MANUAL

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LG POSITION INDICATING AND WARNING SYSTEM -INTRODUCTION

Purpose The PSEUs supply the position data through the left and right
ARINC 629 buses to AIMS, the Warning Electronics Units and to The landing gear position indicating and warning system shows
other systems. landing gear position on the flight deck displays.
Inputs
The landing gear position indicating and warning system uses these proximity sensors to supply landing gear position data to the PSEUs:
*
Left and right MLG up and locked proximity sensors (4)

*
Left and right MLG side brace down proximity sensors (4)

*
left and right MLG drag brace down proximity sensors (4)

*
Left and right MLG door closed proximity sensors (4)

*
Left and right MLG truck tilt proximity sensors (4)

*
NLG locked proximity sensors (2)

*
NLG up proximity sensors (2)

*
NLG down proximity sensors (2)

*
NLG not compressed proximity sensors (2)

*
NLG door closed proximity sensors (2).

The PSEUs also use input from the landing gear control lever and the alternate gear extend switch to.
General Description
The landing gear position indicating and warning system is a dual redundant system. Each PSEU gets position input from a different proximity sensor in each location.
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LG POSITION INDICATING AND WARNING SYSTEM -INTRODUCTION

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LG POSITION INDICATING AND WARNING SYSTEM -MLG UP AND LOCKED PROXIMITY SENSORS

Purpose
Two MLG up and locked sensors on each of the MLG supply uplock input to the PSEUs.
Location
The sensors are on the forward and aft sides of the MLG uplock assembly.
The proximity sensor targets are also on the uplock assembly and move with the uplock hook.
Functional Description
The targets are near the proximity sensors when the uplock assembly is in the uplocked position.
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LG POSITION INDICATING AND WARNING SYSTEM -MLG UP AND LOCKED PROXIMITY SENSORS

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LG POSITION INDICATING AND WARNING SYSTEM -MLG DOWN PROXIMITY SENSORS

Purpose
Main landing gear down proximity sensors supply downlock data to the PSEUs. There are four MLG down proximity sensors for each MLG.
　
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