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Door uplock proximity detectors signal the LGCIU that
the doors are uplocked.
As soon as the last door closes and locks, the LGCIU
cancels the landing gear "raise" signal and maintains
the door close signal as long as the safety valve is
open.
TMULDGE03-T06 LEVEL 3
EFFECTIVITY 32-31-00 Page 12
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 32 LANDING GEAR
UF94200
EFFECTIVITY Page 42
ALL
LANDING GEAR RETRACTION - DOOR CLOSING
TMULDGE03-P06 LEVEL 3
EFFECTIVITY 32-31-00 Page 13
Nov 30/97
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 32 LANDING GEAR
UF94200
EFFECTIVITY Page 43
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LANDING GEAR NORMAL OPERATION
RETRACTION
HYDRAULIC SHUT OFF
Air Data Inertial Reference Units 1 and 3 send a signal
to the safety valve to shut off the hydraulic pressure
to the landing gear system.
When the airspeed is greater than 260 ±5 kts the
hydraulic circuit to the landing gear is depressurized.
TMULDGE03-T07 LEVEL 3
EFFECTIVITY 32-31-00 Page 14
Nov 30/97
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 32 LANDING GEAR
UF94200
EFFECTIVITY Page 44
ALL
LANDING GEAR RETRACTION - HYDRAULIC SHUT OFF
TMULDGE03-P07 LEVEL 3
EFFECTIVITY 32-31-00 Page 15
Nov 30/97
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 32 LANDING GEAR
UF94200
EFFECTIVITY Page 45
ALL
SELF EXAMINATION
What is the normal retraction sequence?
A - Door open, gear up, door close, cancel
gear up signal.
B - Door open, gear up, door close, maintain
gear up signal.
C - Door open, gear up, door close, cancel
door close signal.
Before the landing gear can be retracted, what must
the LGCIU detect?
A - Three shock absorbers extended.
B - Three shock absorbers compressed.
C - Only one shock absorber extended.
When is the hydraulic circuit depressurized after
retraction?
A - As soon as the selector lever is moved
to neutral.
B - As soon as the airspeed is greater than
260 ± 5 kts.
C - As soon as the last door is closed.
TMULDGE03 LEVEL 3
EFFECTIVITY 32-31-00 Page 16
Nov 30/97
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 32 LANDING GEAR
UF94200
EFFECTIVITY Page 46
ALL
32 - LANDING GEAR
32-33-00 LANDING GEAR AND DOORS - FREE
FALL EXTENSION
CONTENTS:
General
Initial Configuration
Lever Movement up to 1.5 Turns
Lever Movement between 1.6 and 1.8 Turns
Lever Movement between 1.9 and 3 Turns
Self Examination
TMULDGL02 LEVEL 3
EFFECTIVITY 32-33-00 Page 1
Jan 31/95
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 32 LANDING GEAR
UF94200
EFFECTIVITY Page 47
ALL
LANDING GEAR AND DOORS - FREE FALL EXTENSION
GENERAL
Free fall extension is used either when :
- both LGCIUs have failed,
- green hydraulic low pressure,
- one door cannot be opened hydraulically,
- one gear leg cannot be lowered hydraulically.
If both LGCIUs fail the solenoids are not energized
and the door "close" lines are not pressurized.
If the green hydraulic pressure is low the door "close"
lines are not pressurized.
INITIAL CONFIGURATION
The safety valve is open and residual pressure supplies
the door "close" line downstream of the selector valve.
Gears and doors are uplocked.
Note that the door bypass valves (1, 2 and 3) are only
operated during ground maintenance.
TMULDGL02-T01 LEVEL 3
EFFECTIVITY 32-33-00 Page 2
Jan 31/95
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 32 LANDING GEAR
UF94200
EFFECTIVITY Page 48
ALL
FREE FALL EXTENSION - INITIAL CONFIGURATION
TMULDGL02-P01 LEVEL 3
EFFECTIVITY 32-33-00 Page 3
Jan 31/95
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 32 LANDING GEAR
UF94200
EFFECTIVITY Page 49
ALL
LANDING GEAR AND DOORS - FREE FALL EXTENSION
LEVER MOVEMENT UP TO 1.5 TURNS
Rotating the gravity extension crank handle initially
operates the cut-out valve and both vent valves to
depressurize the system by connecting the entire
landing gear hydraulic system to return.
TMULDGL02-T02 LEVEL 3
EFFECTIVITY 32-33-00 Page 4
Jan 31/95
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