777 AIRCRAFT MAINTENANCE MANUAL
NOSE LANDING GEAR AND DOORS -SHOCK STRUT
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NOSE LANDING GEAR AND DOORS -DRAG STRUT AND LOCK LINK ASSEMBLIES
General
Drag strut and lock link assemblies hold the nose landing gear in the extended and retracted positions.
Drag Strut Assembly
The drag strut assembly has upper and lower struts which attach by a hinge in the center.
The upper drag strut is trunnion-mounted to the side walls in the nose wheel well.
The lower drag strut attaches to a hinge on the shock strut.
Lock Link Assembly
The lock link assembly has forward and aft lock links and two lock springs.
The forward and aft lock links attach by a hinge.
The lock springs help keep the lock link in the locked position.
Training Information Point
A lock pin hole in the lock link assembly permits you to install a down lock pin. Use this pin to keep the nose gear in the down and locked position.
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NOSE LANDING GEAR AND DOORS -DRAG STRUT AND LOCK LINK ASSEMBLIES
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NOSE LANDING GEAR AND DOORS -NLG DOORS
Nose Landing Gear Doors
Two forward and two aft NLG doors aerodynamically seal the nose gear wheel well to reduce drag.
Forward Doors
The forward doors attach to the outboard edges of the NLG wheel well. A hydraulic actuator opens and closes the forward doors. Each forward door attaches to the NLG wheel well with two hinges.
Aft Doors
The aft doors attach to the outboard edges of the NLG wheel well. They connect to the side braces and operate mechanically with the gear during extension and retraction. Each aft door attaches to the NLG wheel well with two hinges.
The nose landing gear doors are made of composite materials.
Training Information Point
You use the alternate extension system to open the forward doors on the ground. See the landing gear alternate extension system section for more information on the ground door operation (SECTION 32-35).
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777 AIRCRAFT MAINTENANCE MANUAL
NOSE LANDING GEAR AND DOORS -NLG DOORS
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777 AIRCRAFT MAINTENANCE MANUAL
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32-30-00
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BOEING PROPRIETARY -Copyright # -Unpublished Work -See title page for details.
EXTENSION-RETRACTION -INTRODUCTION
General
Extension and retraction lowers and raises the landing gear.
These are part of extension and retraction:
*
The landing gear control system (SECTION 32-31)
*
The main landing gear extension and retraction (SECTION 32-32)
*
The nose landing gear extension and retraction (SECTION 32-34)
*
The landing gear alternate extension system (SECTION 32-35).
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777 AIRCRAFT MAINTENANCE MANUAL
EXTENSION-RETRACTION -INTRODUCTION
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777 AIRCRAFT MAINTENANCE MANUAL
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32-31-00
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LANDING GEAR CONTROL SYSTEM -INTRODUCTION
Purpose
The landing gear control system controls the extension and retraction of the main and nose landing gears.
Components
Landing gear control system components are:
*
The landing gear control lever module
*
The NLG selector/bypass valve
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