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CSP 700−6
Volume 2
15−10−15
RETRACTION AND EXTENSION SYSTEM
Normal retraction and extension of the landing gear is initiated by landing gear control lever
selection. The retraction or extension signal is sent to the LGECU which monitors various landing
gear proximity sensing inputs and weightonwheels
(WOW) inputs. If the correct parameters are
met, the LGECU sequentially energizes the appropriate selector valves to retract or extend the
landing gear using No. 2 and No. 3 hydraulic system pressures.
Landing Gear Retraction
For landing gear retraction, once the airplane is airborne (example: weightoffwheels,
nose wheel
centered) the LGECU commands and monitors the following events:
· Landing gear control lever solenoid downlock releases to permit up selection of the landing
gear control lever.
GEAR
IN TRANSIT
GF1510_015
LDG GEAR
· The door selector valve is energized and No. 3 hydraulic system powers all door uplocks
and door actuators.
· When the doors indicate open, the nose landing gear and main landing gear selector valves
are energized.
· No. 3 hydraulic system releases the respective downlocks and completely retracts the nose
landing gear (extension/retraction actuator). No. 2 hydraulic system will power the main
extension/retraction actuators and completely retracts the main landing gear assemblies.
The side brace actuator is energized only to disengage the internal downlocks during
retraction.
· The brake control unit will command the brake control valves (for approximately 4 seconds
after takeoff)
to pressurize the brakes and stop wheel rotation.
· Uplocks of the nose landing gear and the main landing gear are engaged to secure the
landing gears in the retracted position.
· 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
deenergized
when the gear is up and locked.
UP UP
GEAR
UP
UP AND LOCKED
GF1510_016
LANDING GEAR
Flight Crew Operating Manual REV 41, Jul 08, 2004
CSP 700−6
Volume 2
15−10−16
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.
GEAR
IN TRANSIT
GF1510_017
LDG GEAR
· The door selector valve is energized and No. 3 hydraulic system powers all door uplocks
and door actuators.
· When the doors indicate open, the nose landing gear and main landing gear selector valves
are energized.
· 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 deenergized.
· When the main landing gear is almost down (sensed by proximity) the retract actuator
powered by hydraulic system No. 2 is deenergized.
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.
· Downlocks of the nose landing gear and the main landing gear are engaged to secure the
landing gears in the extended position.
· 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.
DOWN AND LOCKED
GEAR
DN DN DN
GF1510_018
LANDING GEAR
REV 41, Jul 08, 2004 Flight Crew Operating Manual
CSP 700−6
Volume 2
15−10−17
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.
GF1510_019 MANUAL LANDING GEAR EXTENSION
Should a failure occur in the normal actuation system, landing gear extension is possible by pulling
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