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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.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
LANDING GEAR
GEARS AND DOORS - DESCRIPTION
A330/A340 FLEET DSC-32-10-10 P 8/14
FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
LANDING GEAR
GEARS AND DOORS - DESCRIPTION
A330/A340 FLEET DSC-32-10-10 P 9/14
FCOM 19 AUG 10
LANDING GEAR INDICATION AND WARNING ARCHITECTURE
Applicable to:
SCHEMATICS
Note: The landing gear position indications on center instrument panel are still provided by
LGCIU 1 even when LGCIU 2 is controlling gear cycle.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
LANDING GEAR
GEARS AND DOORS - DESCRIPTION
A330/A340 FLEET DSC-32-10-10 P 10/14
FCOM 19 AUG 10
Applicable to: ,
SCHEMATICS
Note: The landing gear position indications on center instrument panel are still provided by
LGCIU 1 even when LGCIU 2 is controlling gear cycle.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
LANDING GEAR
GEARS AND DOORS - DESCRIPTION
A330/A340 FLEET DSC-32-10-10 P 11/14
FCOM 19 AUG 10
Applicable to:
GRAVITY EXTENSION
The gravity extension system is an electro-mechanical system, controlled through two selectors
located on the center instrument panel. It permits main and nose landing gear extension in case of
a normal extension system failure.
When the related electrical selectors are set to down, the :
Landing gear hydraulic system is isolated from ‐ the green hydraulic system
‐ Main, nose landing gear doors, and gears electrically unlock
‐ Main and nose landing gears extend by gravity
Locking ‐ springs assist the downlocking
‐ Main and nose landing gear doors remain open.
‐ The center gear stays retracted and doors are closed.
After a free fall extension, it is possible to restore normal operation, provided green hydraulic
pressure is available.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
LANDING GEAR
GEARS AND DOORS - DESCRIPTION
A330/A340 FLEET DSC-32-10-10 P 12/14
FCOM 19 AUG 10
The indications given in the cockpit are the same as those for normal extension and retraction
(retraction indication for center landing gear).
Note: In case of landing gear gravity extension, the nose wheel steering is lost.
Applicable to: ,
GRAVITY EXTENSION
The gravity extension system is an electro-mechanical system, controlled through two selectors
located on the center instrument panel. It permits main and nose landing gear extension in case of
a normal extension system failure.
When the related electrical selectors are set to down, the :
‐ Landing gear hydraulic system is isolated from the green hydraulic system
‐ Main, nose landing gear doors, and gears electrically unlock
‐ Main and nose landing gears extend by gravity
‐ Locking springs assist the downlocking
‐ Main and nose landing gear doors remain open.
After a free fall extension, it is possible to restore normal operation, provided green hydraulic
pressure is available.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
LANDING GEAR
GEARS AND DOORS - DESCRIPTION
A330/A340 FLEET DSC-32-10-10 P 13/14
FCOM 19 AUG 10
The indications given in the cockpit are the same as those for normal extension and retraction.
Note: In case of landing gear gravity extension, the nose wheel steering is lost.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
LANDING GEAR
GEARS AND DOORS - DESCRIPTION
Intentionally left blank
A330/A340 FLEET DSC-32-10-10 P 14/14
FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
LANDING GEAR
GEARS AND DOORS - LANDING GEAR SYSTEM INTERFACE
A330/A340 FLEET DSC-32-10-20 P 1/4
FCOM 19 AUG 10
LGCIU
Applicable to: ALL
Two LGCIUs receive landing gear position information from the proximity detectors : landing gear
downlocked or uplocked, shock absorber compressed or extended, door open or closed.
This information is sent by the LGCIUs to other aircraft systems.
Proximity detector failures :
electrical failure is detected by the LGCIU which signals the associated ‐ output to the flight position
(shock absorber not compressed or landing gear uplocked).
Landing gear operation is then automatically controlled by the non affected LGCIU.
　
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