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the end of gear retraction.
All gear doors open during landing gear transit. The hydraulically operated doors close at the end of
each retraction and extension sequence.
Gears and doors’ actuation are electrically-signalled by two Landing Gear Control and Interface Units
(LGCIUs).
The LGCIUs process gear and door positions, sequencing control and gear lever selection. They
also provide landing gear information on the ECAM, and ground/flight signals for other aircraft
systems.
GENERAL
Applicable to: ,
The landing gear consists of :
‐ Two inboard retracting main gears,
‐ A forward retracting nose gear.
Gear doors enclose the landing gear bays. Gears and doors are electrically-controlled and
hydraulically-operated.
The doors which are fitted to the landing struts are mechanically-operated by the gear, and close at
the end of gear retraction.
All gear doors open during landing gear transit. The hydraulically operated doors close at the end of
each retraction and extension sequence.
Gears and doors’ actuation are electrically-signalled by two Landing Gear Control and Interface Units
(LGCIUs).
The LGCIUs process gear and door positions, sequencing control and gear lever selection. They
also provide landing gear information on the ECAM, and ground/flight signals for other aircraft
systems.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
LANDING GEAR
GEARS AND DOORS - DESCRIPTION
A330/A340 FLEET DSC-32-10-10 P 2/14
FCOM 19 AUG 10
MAIN GEAR
Applicable to: ALL
Each main gear is a four wheel, twin tandem bogie assembly having an oleopneumatic shock
absorber.
Each main wheel is fitted with an antiskid brake.
A shortening mechanism, attached to the wing, reduces main gear length by retracting the shock
absorber into the main leg during retraction.
An hydraulically-operated pitch trimmer on each bogie beam damps the movement and ensures
return to normal position after liftoff.
NOSE GEAR
Applicable to: ALL
The two-wheel nose gear comprises an oleopneumatic shock strut and a nosewheel steering system.
It retracts forward into the fuselage.
CENTER GEAR
Applicable to:
The center gear is a two wheel assembly (identical wheels to those of the main gears) installed on
the rear bulkhead in the main gearbay.
It comprises a two stage oleopneumatic shock absorber installed in the main fitting.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
LANDING GEAR
GEARS AND DOORS - DESCRIPTION
A330/A340 FLEET DSC-32-10-10 P 3/14
FCOM 19 AUG 10
SCHEMATICS
Applicable to: ALL
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
LANDING GEAR
GEARS AND DOORS - DESCRIPTION
A330/A340 FLEET DSC-32-10-10 P 4/14
FCOM 19 AUG 10
MAIN L/G
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
LANDING GEAR
GEARS AND DOORS - DESCRIPTION
A330/A340 FLEET DSC-32-10-10 P 5/14
FCOM 19 AUG 10
Applicable to: ALL
NOSE L/G
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
LANDING GEAR
GEARS AND DOORS - DESCRIPTION
A330/A340 FLEET DSC-32-10-10 P 6/14
FCOM 19 AUG 10
Applicable to:
CENTER GEAR
GEAR AND DOOR OPERATION
Applicable to:
NORMAL OPERATION
Landing gear normal operation is controlled by the lever located on the center instrument panel.
Gear and door sequencing is electrically-controlled by the LGCIUs. Each LGCIU controls one
complete gear cycle and switches over automatically at each landing gear retraction cycle or in
case of failure.
All gears and doors are hydraulically-actuated by the green hydraulic system. Hydraulic supply
is automatically isolated by closing a safety valve above 280 kt. It is maintained closed until the
landing gear lever is moved to the DOWN position and the aircraft speed decreases below 280 kt.
The center gear may be inhibited by ground maintenance action. Therefore, it will be
mechanically-fixed in the uplock position while doors will continue to operate during the landing
gear retract/extend sequence.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
LANDING GEAR
GEARS AND DOORS - DESCRIPTION
A330/A340 FLEET DSC-32-10-10 P 7/14
FCOM 19 AUG 10
GEAR AND DOOR OPERATION
Applicable to: ,
NORMAL OPERATION
Landing gear normal operation is controlled by the lever located on the center instrument panel.
Gear and door sequencing is electrically-controlled by the LGCIUs. Each LGCIU controls one
complete gear cycle and switches over automatically at each landing gear retraction cycle or in
　
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