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fully open position back to the LGCIU in order to
continue the sequence.
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ALL
LANDING GEAR EXTENSION - DOOR OPENING
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ALL
LANDING GEAR NORMAL OPERATION
EXTENSION
GEAR DOWN
When ALL doors are fully open, the LGCIU commands a
gear extension while maintaining the doors "open"
signal.
The gear proximity detectors signal to the LGCIU that
the gears are downlocked.
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
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UF94200
EFFECTIVITY Page 34
ALL
LANDING GEAR EXTENSION - GEAR DOWN
TMULDGE03-P02 LEVEL 3
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
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EFFECTIVITY Page 35
ALL
LANDING GEAR NORMAL OPERATION
EXTENSION
DOOR CLOSING
When ALL the gear is down and locked, the LGCIU signals
the doors to close and lock stay actuators to
pressurize, while maintaining the gear extended
signal.
Door closing hydraulic pressure is fed to the lock
stay actuators to back up the downlock springs.
Door uplock proximity detectors signal to the LGCIU
that the doors are uplocked.
As the doors begin to close, the LGCIU cancels the
gear extended signal while maintaining the door "close"
signal.
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
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UF94200
EFFECTIVITY Page 36
ALL
LANDING GEAR EXTENSION - DOOR CLOSING
TMULDGE03-P03 LEVEL 3
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EFFECTIVITY Page 37
ALL
LANDING GEAR NORMAL OPERATION
RETRACTION
Setting the landing gear control lever to UP causes
system 1 and 2 changeover. This allows the system which
was previously in standby to control the next
retraction and extension sequence.
Each Landing Gear Control Interface Unit controls one
complete gear cycle: one UP selection and one DOWN
selection.
DOOR OPENING
The LGCIU must detect all three shock absorbers
extended before allowing the selection of the landing
gear control lever to UP.
The LGCIU signals the doors to open via selector
valves, and the doors proximity detectors signal the
doors’ fully open position back to the LGCIU, in order
to continue the sequence.
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
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UF94200
EFFECTIVITY Page 38
ALL
LANDING GEAR RETRACTION - DOOR OPENING
TMULDGE03-P04 LEVEL 3
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 32 LANDING GEAR
UF94200
EFFECTIVITY Page 39
ALL
LANDING GEAR NORMAL OPERATION
RETRACTION
GEAR UP
When ALL doors are fully open, the LGCIU signals the
landing gear to raise while maintaining the doors
"open" signal to keep the doors "open" line
pressurized.
The gear uplock proximity detectors signal the LGCIU
that the gear is uplocked.
TMULDGE03-T05 LEVEL 3
EFFECTIVITY 32-31-00 Page 10
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 32 LANDING GEAR
UF94200
EFFECTIVITY Page 40
ALL
LANDING GEAR RETRACTION - GEAR UP
TMULDGE03-P05 LEVEL 3
EFFECTIVITY 32-31-00 Page 11
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 32 LANDING GEAR
UF94200
EFFECTIVITY Page 41
ALL
LANDING GEAR NORMAL OPERATION
RETRACTION
DOOR CLOSING
When ALL the landing gear is up and locked, the LGCIU
signals the doors to close while maintaining landing
gear UP signal to keep the "raise" line pressurized.
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