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AIRCRAFT SYSTEMS
LANDING GEAR
PRELIMINARY PAGES - TABLE OF CONTENTS
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FCOM 19 AUG 10
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
LANDING GEAR
GEARS AND DOORS - DESCRIPTION
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GENERAL
Applicable to: ALL
The landing gear consists of :
two ‐ main gear that retract inboard,
‐ a nose gear that retracts forward.
Doors enclose the landing gear bays. Gear and doors are electrically controlled and hydraulically
operated.
The doors, which are fitted to the landing gear struts, are operated mechanically by the gear and
close at the end of gear retraction.
All gear doors open while the gear is retracting or extending.
Two Landing Gear Control and Interface Units (LGCIUs) control the extension and retraction of the
gear and the operation of the doors. They also supply information about the landing gear to ECAM
for display, and send signals indicating whether the aircraft is in flight or on the ground to other
aircraft systems.
A hand crank on the center pedestal allows the flight crew to extend the landing gear if the aircraft
loses hydraulic systems or electrical power.
MAIN GEAR
Applicable to: ALL
Each main gear has twin wheels and an oleopneumatic shock absorber.
Each main wheel has an antiskid brake.
NOSE GEAR
Applicable to: ALL
The two-wheeled nose gear has an oleopneumatic shock strut and a nose wheel steering system.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
LANDING GEAR
GEARS AND DOORS - DESCRIPTION
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DRAWINGS
Applicable to: ALL
MAIN LANDING GEAR
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
LANDING GEAR
GEARS AND DOORS - DESCRIPTION
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NOSE GEAR
OPERATION OF GEAR AND DOORS
Applicable to: ALL
NORMAL OPERATION
The flight crew normally operates the landing gear by means of the lever on the center instrument
panel.
The LGCIUs control the sequencing of gear and doors electrically. One LGCIU controls one
complete gear cycle, then switches over automatically to the other LGCIU at the completion of the
retraction cycle. It also switches over in case of failure.
The green hydraulic system actuates all gear and doors. When the aircraft is flying faster than
260 kt, a safety valve automatically cuts off hydraulic supply to the landing gear system. Below
260 kt, the hydraulic supply remains cut off as long as the landing gear lever is up.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
LANDING GEAR
GEARS AND DOORS - DESCRIPTION
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FCOM 19 AUG 10
EMERGENCY EXTENSION
If the normal system fails to extend the gear hydraulically, the flight crew can use a crank to extend
it mechanically.
When a crew member turns the crank, it :
isolates the landing gear hydraulics ‐ from the green hydraulic system,
‐ unlocks the landing gear doors and the main and nose main gear,
‐ allows gravity to drop the gear into the extended position.
Locking springs help the crew to crank the main gear into the locked condition, and aerodynamic
forces assist in the locking of the nose gear.
The gear doors remain open.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
LANDING GEAR
GEARS AND DOORS - DESCRIPTION
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FCOM 19 AUG 10
The flight crew can reset the emergency extension system in flight after using it for training (if
green hydraulic pressure is available).
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
LANDING GEAR
GEARS AND DOORS - DESCRIPTION
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A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
LANDING GEAR
GEARS AND DOORS - LANDING GEAR SYSTEM/INTERFACE
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LGCIUS
Applicable to: ALL
GENERAL
The LGCIUs receive position information from the landing gear, cargo door, and landing flap
systems.
LANDING GEAR
The LGCIUs receive the following information about the landing gear from proximity detectors :
‐ gear locked down or up,
‐ shock absorbers compressed or extended,
‐ landing gear door open or closed.
　
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