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The alternate extend power pack has a hydraulic pump operated by an electric motor. The alternate extend power pack pressurizes fluid from the center hydraulic system. This fluid then goes to door release/safety valve modules for each landing gear and unlocks the landing gear doors.
Fluid then goes to alternate uplock release actuators for each landing gear and unlocks the uplocks for the landing gear.
The landing gear doors open and the landing gear extend by airloads and their own weight. The landing gear tires may contact the landing gear doors during an alternate extension.
The alternate extend pressure switch stops operation of the power pack after the extend cycle is complete.
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LANDING GEAR ALTERNATE EXTENSION SYSTEM -INTRODUCTION

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LANDING GEAR ALTERNATE EXTENSION SYSTEM -COMPONENT LOCATIONS

Main Landing Gear Wheel Well
These components are in each main landing gear wheel well:
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Main landing gear door release/safety valve module

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Main landing gear alternate uplock release actuator.

The alternate extend power pack is in the left main landing gear wheel well.
Nose landing Gear Wheel Well
These components are in the nose landing gear wheel well:
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Nose landing gear door release/safety valve module

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Nose landing gear alternate uplock release actuator

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Alternate extend hydraulic pressure switch.

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LANDING GEAR ALTERNATE EXTENSION SYSTEM -COMPONENT LOCATIONS

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LANDING GEAR ALTERNATE EXTENSION SYSTEM -ALTERNATE GEAR SWITCH

General
The alternate gear switch is on the landing gear panel on the P2 center forward panel.
This switch is a guarded, two-position toggle switch. The positions of the switch are NORM and DOWN. The switch is spring-loaded to the NORM position.
You hold the alternate gear switch momentarily in the DOWN position to start the alternate gear extension.
Training Information Point
You can operate the alternate gear switch with the landing gear lever in the UP or DN position.
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LANDING GEAR ALTERNATE EXTENSION SYSTEM -ALTERNATE GEAR SWITCH

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777 AIRCRAFT MAINTENANCE MANUAL

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LANDING GEAR ALTERNATE EXTENSION SYSTEM -GROUND DOOR OPERATION CONTROLS

Purpose
Ground door switches permit you to open and close the landing gear doors on the ground.
Location
These switches are on these two panels:
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P56 wheel well electrical service panel

*
P40 service and APU shutdown panel.

Wheel Well Electrical Service Panel Switches
The wheel well electrical service panel is on the bottom of the airplane behind the main landing gear wheel wells.
These two switches on the wheel well electrical service panel control the landing gear doors:
*
Arm doors switch

*
All doors open/MLG doors close switch.

The arm doors switch is a two-position toggle switch. The two positions are OFF and ARM. The all doors open/MLG doors close switch is a three position switch. The positions are MLG DOOR CLOSE, OFF, and ALL DOORS OPEN. To operate the switches, you must pull them out from the OFF detent. Both switches are spring-loaded to OFF.
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You must operate both switches at the same time. You move the arm doors switch to the ARM DOORS position. You move the all doors open/MLG doors close switch to the ALL DOORS OPEN position to open all landing gear doors (MLG and NLG). This operates the LG alternate extension system.
You move the arm doors switch to the ARM DOORS position and the all doors open/MLG doors close switch to the MLG DOORS CLOSE position to close the MLG doors. The doors close with center hydraulic system pressure.
Two control switches make sure that a single electrical failure does not accidentally operate the landing gear doors.
Service and APU Shutdown Panel Switches
The service and APU shutdown panel is on the aft side of the nose landing gear shock strut.
Two switches on the service and APU shutdown panel operate the nose landing gear doors:
　
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