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MAIN DOOR
The main door is attached to the fuselage struture by
two hinges and is operated by an hydraulic actuator.
Attached to the forward end of the main door is the
hydraulic actuator and an uplock roller which is used
to keep the main door in the closed position.
Installed on the rear end of the main door are steps,
used for access to the gear well compartment.
Two ramps are installed on the inside of the main door.
These ramps make sure that the gear does not catch on
the main door during a free-fall extension.
Two proximity sensors and targets send the door open
position signal of the main door to the Landing Gear
Control and Interface Units (LGCIUs).
MAIN LANDING GEAR DOOR UPLOCK
The MLG door uplock is closed mechanically, locking
the door in the closed position, and hydraulically
opened, releasing the door during normal extension and
retraction sequences. The uplock can also be opened
mechanically in free fall extension and ground door
opening.
HINGED FAIRING
The hinged fairing is attached to the wing skin by a
single hinge and to the landing gear by an adjustable
tie rod.
The adjustable tie rod causes the hinged fairing to
follow the landing gear during the landing gear
extension and retraction.
FIXED FAIRING
The fixed fairing is attached to the outboard side of
the landing gear main fitting by two types of
attachment assembly.
Two adjustable studs are installed on the front of the
main fitting.
Three rod ends are installed, one on the front of the
main fitting and two on the rear of the main fitting.
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MAIN LANDING GEAR DOORS DESCRIPTION
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32 - LANDING GEAR
32-21-00 LANDING GEAR AND DOORS - NOSE
LANDING GEAR DESCRIPTION
CONTENTS:
General
Shock Strut Assembly
Shock Absorber
Actuating Cylinder
Drag Strut Assembly
Lockstay Assembly
Lockstay Downlock Actuator
Sliding Tube
Rotating Tube
Torque Link
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EFFECTIVITY 32-21-00 Page 1
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
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EFFECTIVITY Page 101
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LANDING GEAR AND DOORS - NOSE LANDING GEAR DESCRIPTION
GENERAL
The nose gear retracts forward into the fuselage, and
thus favorably assisted by aerodynamic moments during
gear extension.
The nose gear includes :
- a shock strut assembly,
- a drag strut assembly,
- a lockstay assembly,
- a gear actuating cylinder,
- nose wheel steering system components.
SHOCK STRUT ASSEMBLY
The shock strut assembly hangs on the structure from
two trunnions. It includes the shock absorber.
SHOCK ABSORBER
The shock absorber is an integral shock absorber filled
with hydraulic fluid and nitrogen through a single
standard servicing valve at the upper part of the leg.
It also includes the two centering cams which return
the wheels to the centered position when the gear is
extended.
ACTUATING CYLINDER
The actuating cylinder operates the nose gear during
retraction and extension sequences.
DRAG STRUT ASSEMBLY
The drag strut assembly consists of a forestay at the
top, a tubular arm at the bottom which are
interconnected by a universal joint. The uplock roller
is installed on the upper hinge pin of the universal
joint.
LOCKSTAY ASSEMBLY
The lockstay assembly provides an overcentered stop
and a geometric lock of the nose gear. It includes
both systems downlock proximity detectors.
On the ground, a safety pin locks the two arms of the
lockstay.
LOCKSTAY DOWNLOCK ACTUATOR
The downlock actuator locks and unlocks both brace
assemblies of the lockstay. It is assisted by two
springs.
SLIDING TUBE
The sliding tube includes the wheel axle. It is
inclined 9 degrees forward, this design allows the
wheels to return freely to the centered position.
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