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The brake control unit will command the brake control valves (for approximately 4 seconds after take-off) to pressurize the brakes and stop wheel rotation.
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Uplocks of the nose landing gear and the main landing gear are engaged to secure the landing gears in the retracted position.
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When uplock is achieved, the nose and main landing gear doors selector valves are energized to close the nose and main landing gear doors. The gear selector valves are de-energized when the gear is up and locked.
UP AND LOCKED
GF1510_016
Volume 2 Flight Crew Operating Manual
Rev 2A, Apr 11, 2005
RETRACTION AND EXTENSION SYSTEM (CONT'D)
Landing Gear Extension
For landing gear extension, the LGECU commands and monitors the following events:
. Landing gear control lever is manually selected to the DN position.
IN TRANSIT
GF1510_017
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The door selector valve is energized and No. 3 hydraulic system powers all door uplocks and door actuators.
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When the doors indicate open, the nose landing gear and main landing gear selector valves are energized.
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No. 3 hydraulic system releases the respective uplocks and extends the nose landing gear (extension/retraction actuator). No. 2 hydraulic system will power the main extension/ retraction actuators (used to raise and lower the main gear) to extend the main landing gear and at this time the side brace actuator remains de-energized.
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When the main landing gear is almost down (sensed by proximity) the retract actuator powered by hydraulic system No. 2 is de-energized. At the same time, the main landing gear (side brace actuator) is energized using hydraulic system No. 3 to power the gear to the downlock position.
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Downlocks of the nose landing gear and the main landing gear are engaged to secure the landing gears in the extended position.
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When downlock is achieved, the nose and main landing gear doors selector valves are energized to close the nose and main landing gear doors. The nose and main gear selector valves remain energized to keep a positive pressure on the downlock mechanisms.
GF1510_018
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual Volume 2
LANDING GEAR
LANDING GEAR MANUAL RELEASE HANDLE
The following schematic represents the operation of the landing gear release handle in the extended and stowed positions.
LG Manual Release Handle
. To manually extend the landing gear:
Pull the handle through all detent positions until the handle locks in the full extended position.
. To reset the manual release system: Keep a slight pressure on the handle to pre vent the handle from rapidly returning to stow
while pushing in the "PUSH FULLY TO STOW" button. Guide the handle to its stow position.
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本文链接地址：庞巴迪环球5000公务机机组操作手册 Bombardier Global-起落架(9)
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