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Normal retraction or 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 weight-on-wheels
(WOW) inputs. If the correct parameters are met, the LGECU sequentially energizes
the appropriate selector valves to retract or extend the landing gear using hydraulic
pressures No. 2 and No. 3.
HORN
MUTED
GX_14_016
For Training Purposes Only
Sept 04
14-19
P I LOT T R A I N I N G GU I D E
LANDING GEAR AND BRAKES
LANDING GEAR RETRACTION
For landing gear retraction, once the airplane is airborne (i.e.: weight-off-wheels,
nosewheel 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
• The door selector valve is energized and hydraulic system No. 3 powers all door
uplocks and door actuators
• When the doors indicate open, the nose landing gear and main landing gear
selector valves are energized
• Hydraulic system No. 3 releases the respective downlocks and completely retracts
the nose landing gear (extension/retraction actuator). Hydraulic system No. 2 will
power the main gear 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 main 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 de-energized when the gear is up and locked
GEAR UP
DN
DN LCK
RELEASE
LDG GEAR
GX_14_017
IN TRANSIT
GEAR
UP UP UP
GX_14_018
UP AND LOCKED
P I LOT T R A I N I N G GU I D E
LANDING GEAR AND BRAKES
14-20 For Training Purposes Only
Sept 04
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
• The door selector valve is energized and hydraulic system No. 3 powers all door
uplocks and door actuators
• When the doors indicate open, the nose landing gear and main landing gear
selector valves are energized
• Hydraulic system No. 3 releases the respective uplocks and extends the nose
landing gear (extension/retraction actuator). Hydraulic system No. 2 will power
the main extension/retraction actuator to extend the main landing gear and at this
time the side brace actuator remains de-energized
• When the main landing gear is almost down (sensed by proximity) the extension/
retraction 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
• 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
GEAR UP
DN
DN LCK
RELEASE
LDG GEAR
GX_14_019
IN TRANSIT
DN DN
GEAR
DN
DOWN AND LOCKED
GX_14_020
For Training Purposes Only
Sept 04
14-21
P I LOT T R A I N I N G GU I D E
LANDING GEAR AND BRAKES
Landing Gear Manual Release Handle
MANUAL LANDING GEAR EXTENSION
Should a failure occur in the normal actuation system, landing gear extension is
possible by pulling the landing gear manual release handle located on the center
pedestal in the flight compartment. The design configuration allows the system to be
restowed to its initial position under any conditions by simply reversing the manual
release handle movement.
NOTE
Manual landing gear extension is carried out with the landing
gear control lever in the down position.
For manual extension procedures, refer to the non-normal procedures, MANUAL
LANDING GEAR EXTENSION in the Airplane Flight Manual CSP 700-1.
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