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EFFECTIVITY 32-00-00 Page 3
Aug 31/96
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 32 LANDING GEAR
UF94200
EFFECTIVITY Page 73
ALL
LANDING GEAR DOORS GROUND OPENING DESCRIPTION/OPERATION
HYDRAULIC OPERATION
Each by-pass valve has three hydraulic connections
marked A, B and C.
- port A : door open line,
- port B : door close line from the selector
valve,
- port C : door close line to the door actuating
cylinder.
During normal operation of the landing gear, port A
is closed and port B is connected to port C allowing
the respective door actuating cylinder and door uplock
to be operated.
When the ground door opening control handle is
operated, port B is closed and port A is connected to
port C.
A locking plunger in the by-pass valve stops the
movement of the control lever from the "DOOR OPEN" to
the "DOOR CLOSED" position.
Before any selection can be made, a hydraulic pressure
greater than 70 bars (1015 psi) must be supplied to
port B to retract the locking plunger.
TMULDGW01-T02 LEVEL 3
EFFECTIVITY 32-00-00 Page 4
Aug 31/96
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 32 LANDING GEAR
UF94200
EFFECTIVITY Page 74
ALL
LANDING GEAR AND DOORS GROUND OPENING DESCRIPTION/OPERATION - HYDRAULIC OPERATION
TMULDGW01-P02 LEVEL 3
EFFECTIVITY 32-00-00 Page 5
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 32 LANDING GEAR
UF94200
EFFECTIVITY Page 75
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THIS PAGE INTENTIONALLY LEFT BLANK
TMULDGW01 LEVEL 3
EFFECTIVITY 32-00-00 Page 6
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 32 LANDING GEAR
UF94200
EFFECTIVITY Page 76
ALL
32 - LANDING GEAR
32-31-00 LANDING GEAR AND DOORS - LGCIU
CONTROL SIGNALS
CONTENTS:
Up Selection
Down Selection
Door Uplocks
Door Fully Open
Gear Uplocks
Gear Downlocks
Extended or Compressed
Door Selector Valve
Gear Selector Valve
L/G Retraction Interlock Solenoid
LGCIU 2
TMULDGG01 LEVEL 3
EFFECTIVITY 32-31-00 Page 1
Dec 31/94
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 32 LANDING GEAR
UF94200
EFFECTIVITY Page 77
ALL
LANDING GEAR AND DOORS - LGCIU CONTROL SIGNALS
UP SELECTION
Two UP selection signals which come from the lever,
are sent to the Landing Gear Control Interface Unit
(LGCIU) to initiate the gear retraction sequence.
DOWN SELECTION
Two DOWN selection signals coming from the lever, are
sent to the LGCIU to initiate the gear extension
sequence.
DOOR UPLOCKS
Three door uplock signals which come from door uplock
proximity detectors, are sent to the LGCIU to indicate
whether doors are uplocked, or not.
DOOR FULLY OPEN
Four door fully open signals (two for nose doors) which
come from the corresponding proximity detectors, are
sent to the LGCIU to indicate whether doors are fully
open, or not.
GEAR UPLOCKS
Three gear uplock signals which come from gear uplock
proximity detectors, are sent to the LGCIU to indicate
whether gears are uplocked, or not.
GEAR DOWNLOCKS
Three gear downlock signals which come from gear
downlock proximity detectors, are sent to the LGCIU
to indicate whether gears are down and locked, or not.
EXTENDED OR COMPRESSED
Three shock-absorber signals which come from the oleo
proximity detectors are sent to the LGCIU to indicate
whether shock-absorbers are compressed, or not.
Note that nose landing gear "flight" information is
given when the gear is extended and wheels are in the
centered position.
DOOR SELECTOR VALVE
After analysing all the input signals, the LGCIU sends
two signals to the corresponding solenoid of the door
selector valve according to the position of the gears.
GEAR SELECTOR VALVE
After analysing all the input signals, the LGCIU sends
two signals to the corresponding solenoid of the gear
selector valve according to the position of the doors.
L/G RETRACTION INTERLOCK SOLENOID
After analysing all shock absorber signals, the LGCIU
sends a signal to the lever interlock solenoid to
prevent gear retraction if any shock absorber is
compressed.
TMULDGG01-T01 LEVEL 3
EFFECTIVITY 32-31-00 Page 2
Dec 31/94
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 32 LANDING GEAR
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