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EICAS
ELECTRICAL
MANAGEMENT
SYSTEM
GF1510_004
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual Volume 2
LANDING GEAR
NOSE LANDING GEAR ASSEMBLY
The nose gear assembly consists of:
.
Oleo-pneumatic shock strut (main fitting).
.
Hydraulic extension/retraction actuator.
.
Uplock mechanism.
.
Drag brace including a downlock mechanism.
.
Set of nose gear doors and linkages.
The nose gear bay is completely enclosed by an aft door mechanically linked to the nose gear and by two forward doors hydraulically actuated by a mechanism located in the nose landing gear bay area. During normal operation the forward doors open only during gear retraction and extension (transit) operation. The forward doors are manually deployed by the manual release system and can be opened for ground maintenance operation when required. The aft door is mechanically linked to the nose gear and positioned to the open and closed position with each main gear operation.
The nose gear retracts forward into the nose bay area and is held in the retracted position by an uplock mechanism. During normal operation, a downlock actuator and assist springs within the drag brace ensures downlock when the gear is extended. The nose gear is actuated by hydraulic system No. 3 to operate the uplocks (gear and door), downlocks and actuators.
In the event of an hydraulic system failure, a dedicated operating system provides a means to manually extend (freefall) the gear. As with the main gear, emergency extension of the nose gear is achieved by pulling the same landing gear manual release handle located on the pedestal in the flight compartment. Downlock of the nose gear is achieved through a mechanical locking device. Two downlock assist springs mounted on the drag brace assist nose gear extension. System No. 3 hydraulic pressure to the nose gear is maintained while in extended position.
The nose hydraulically actuated doors, gear sequencing and position sensing are controlled and continuously monitored by the LGECU. Any fault or position deviation detected is annunciated on EICAS.
Volume 2 Flight Crew Operating Manual Rev 2A, Apr 11, 2005
LANDING GEAR
NOSE LANDING GEAR SCHEMATIC
NOSE LANDING DOOR
GEAR UPLOCK UPLOCK MANUAL RELEASE
RETRACTION ASSEMBLY
ACTUATOR DOOR RETRACTION
ACTUATOR
AFT DOOR
DRAG BRACE
DOWNLOCK
STEERING ACTUATOR NOSE GEAR FORWARD DOOR
UPLOCK PINTORQUE LINKS (BETWEEN ACTUATORS)(DISCONNECT FOR TOWING) SHOCK STRUT
GF1510_005
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual Volume 2
LANDING GEAR
NOSE GEAR DOWNLOCK SAFETY PIN
A downlock safety pin is installed within the drag brace assembly to secure the nose landing gear in position while on ground.
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