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The shock absorber includes 2 centering cams, the lower
cam is part of the plunger tube and the upper cam is
part of the sliding tube. When the shock absorber is
fully extended the pressure of the nitrogen causes the
cams to engage. The wheels then return automatically
to the center position.
TMULD1I02-T01 LEVEL 2
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
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UF94200
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TMULD1I02-P01 LEVEL 2
LANDING GEAR COMPONENTS - NLG SHOCK ABSORBER - CENTERING CAM
EFFECTIVITY 32-00-00 Page 3
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LANDING GEAR COMPONENTS
MLG SHOCK ABSORBER
LOCATION
ZONE: 731, 741
DESCRIPTION
The shock absorber is a telescopic oleo-pneumatic unit
which includes the sliding tube. It is installed in
the main fitting to transmit the landing, take off and
taxiing loads to the wing.
When the shock absorber is compressed, the load is
transmitted to the hydraulic fluid and nitrogen gas.
The shock absorber is a 2 stage unit and contains four
chambers:
- a first stage gas chamber contains gas at a
low pressure and hydraulic fluid,
- a recoil chamber that contains hydraulic fluid,
- a compression chamber that contains hydraulic
fluid,
- a 2nd stage gas chamber that contains gas at
a high pressure.
Primary control of the shock absorber recoil is:
- the fluid flow from the recoil chamber into
the gas chamber,
- the fluid flow from the gas chamber into
the compression chamber.
TMULD1I02-T02 LEVEL 2
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TMULD1I02-P02 LEVEL 2
LANDING GEAR COMPONENTS - MLG SHOCK ABSORBER
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THIS PAGE INTENTIONALLY LEFT BLANK
TMULD1I02 LEVEL 2
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32 - LANDING GEAR
32-00-00 LANDING GEAR COMPONENTS
CONTENTS:
LGCIU
Proximity Detectors
Safety Valve
Selector Valve Manifold
Hydraulic Fuses
MLG Actuating Cylinder
MLG Uplock Box
MLG Door Actuating Cylinder
MLG Door Uplock Box
NLG Actuating Cylinder
NLG Uplock Box
NLG Door Actuating Cylinder
NLG Door Uplock Box
Cut-Out Valve
Vent Valves
Door Bypass Valves
TMULD2I01 LEVEL 3
EFFECTIVITY 32-00-00 Page 1
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LANDING GEAR COMPONENTS
LGCIU
IDENTIFICATION
FIN: 5GA1 (LGCIU1), 5GA2 (LGCIU2)
LOCATION
ZONE: 121 (LGCIU1), Rack 93VU
122 (LGCIU2), Rack 94VU
DESCRIPTION
Each Landing Gear Control and Interface Unit (LGCIU)
consists of an ARINC 600 4 MCU (Modular Concept Unit)
case that contains:
- 7 Printed Circuit Boards (PCU),
- an On Board Replaceable Memory Module (OBRM),
- a Power Supply Unit (PSU).
PROXIMITY DETECTORS
IDENTIFICATION
FIN: See table
DESCRIPTION
The proximity detector consists of:
- a proximity sensor,
- a sensor target.
The proximity sensor uses the variable reluctance
principle and operates on the detection of ferrous
metals. In this application the ferrous metal sensor
target supplies the electrical signal.
As the sensor target moves into or out of the proximity
sensor’s actuation area it causes a change in the
proximity sensor’s electrical property.
BE CAREFUL: If the aircraft is electrically supplied
and a piece of ferrous metal is set on the
proximity sensor, a flight configuration
can be read by its associated system.
TMULD2I01-T01 LEVEL 3
EFFECTIVITY 32-00-00 Page 2
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LANDING GEAR COMPONENTS - LGCIU - PROXIMITY DETECTORS
TMULD2I01-P01 LEVEL 3
　
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