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selection. The retraction or extension signal is sent to the proximity sensing electronic unit
(PSEU) which monitors various landing gear proximity sensing inputs and weight-on-wheels
inputs. If the correct parameters are met, the PSEU energizes a selector valve to retract or
extend the landing gear using No. 3 hydraulic system.
The landing gear control lever is equipped with a solenoid lock which prevents an up
selection of the landing gear control lever with the aircraft on the ground. In the event of a
solenoid lock malfunction, a downlock release (DN LCK REL) on the landing gear control
panel, permits up selection of the landing gear control lever by overriding the solenoid lock.
Retraction and extension of each landing gear is driven by a retract/extend actuator.
Tension springs assisted by a downlock actuator ensure that the main gear locks in the
down position. The lock is released at the start of the retraction cycle. An uplock assembly
locks the main gear in the retracted position. An uplock release actuator releases the uplock
assembly at the start of the extension cycle.
The nose landing gear (NLG) is hydraulically extended in the aft direction and mechanically
locked in the down position. The NLG is hydraulically retracted in the forward direction and
mechanically locked in the up position.
The main landing gear doors and the nose landing gear aft door are mechanically linked to
the respective landing gears, and therefore, retract and extend with the landing gears. The
nose landing gear forward doors are actuated hydraulically from No. 3 hydraulic system.
The nose landing gear forward doors open before extension and retraction and then close
after extension and retraction.
REV 56, Jan 31/03
Vol. 1 16--20--2
LANDING GEAR
Nose and Main Landing Gear
Flight Crew Operating Manual MASTER
CSP A--013
Main Landing Gear <MST>
Figure 16---20---1
MLG DOOR
ASSEMBLY
DOOR
BRUSH
MLG
RETRACTION
ACTUATOR
DOWNLOCK
ACTUATOR
MLG
SHOCK STRUT
MLG
MAIN BEAM
<0044>
Vol. 1 16--20--3
REV 56, Jan 31/03
LANDING GEAR
Nose and Main Landing Gear
Flight Crew Operating Manual
CSP A--013
MASTER
Nose Landing Gear
Figure 16---20---2
DOOR
ACTUATOR
DOOR
SPRING
FORWARD
DOORS
STEERING
ACTUATORS
DRAG
BRACE
DOOR
SELECTOR
VALVE DOOR
MECHANISM
ACTUATOR
AFT
DOOR
DOWNLOCK
ASSIST SPRINGS
MANUAL
DISCONNECT
TORQUE
LINK
SHOCK
STRUT UPLOCK
PIN
DOOR
MECHANISM
NOSE GEAR
LOCKING PIN
REV 56, Jan 31/03
Vol. 1 16--20--4
LANDING GEAR
Nose and Main Landing Gear
Flight Crew Operating Manual MASTER
CSP A--013
Nose Landing Gear Doors --- Ground Operation
Figure 16---20---3
NOSE DOOR toggle
switch
OPEN -- opens nose landing
gear doors and disables the
nose landing gear door selector
valve. The nose landing gear
doors will remain open with or
without hydraulic power, as
long as the switch is in
this position.
FLT/NORM -- closes nose
landing gear doors and
enables the nose landing
gear door selector valve,
provided there is hydraulic
power.
External Service Panel
CAUTION
Ensure that the nose landing gear bay area is clear
before selecting the nose door switch to FLT/NORM.
EXT AC
PUSH
CKPT CALL
PUSH
HDPH
LAMP MIC
TEST
PKG BRK
ON
BATT
ON
AVAIL
IN USE
CALL
APU
SHUT--OFF
NOSE
DOOR
OPEN
FLT/
NORM
Vol. 1 16--20--5
REV 56, Jan 31/03
LANDING GEAR
Nose and Main Landing Gear
Flight Crew Operating Manual
CSP A--013
MASTER
For landing gear retraction,
Once the aircraft is airborne, with no weight-on-wheels signal, the PSEU commands and
monitors the following events:
S The landing gear control lever solenoid downlock is released to permit UP selection of the
landing gear control lever
S The nose landing gear doors selector valve is energized, to open the forward nose
landing gear doors
S The nose landing gear and main landing gear selector valves are energized to release
the downlocks and the main and nose landing gears retract. Hydraulic pressure from the
nose landing gear up-line is routed to activate the brake control valves to stop main wheel
rotation
S Uplocks of the nose landing gear and main landing gear are engaged to secure the
landing gears in the retracted position
　
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