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S The nose landing gear doors selector valve is energized, to close the forward nose
landing gear doors.
NOTE
The nose landing gear wheel well area can be
inspected by opening the forward nose landing gear
doors, through selection of the NOSE DOOR switch
on the External Service Panel.
For landing gear extension,
The PSEU commands and monitors the following events:
S The landing gear control lever is manually selected to the DN position
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 extend main and nose landing gears
S Downlocks of the nose landing gear and main landing gear are engaged to secure the
landing gears in the extended position
S The nose landing gear doors selector valve is energized, to close the forward nose
landing gear doors.
Ground lock pins are inserted by ground crew to prevent inadvertent retraction of the landing
gear when the aircraft is on the ground.
REV 56, Jan 31/03
Vol. 1 16--20--6
LANDING GEAR
Nose and Main Landing Gear
Flight Crew Operating Manual MASTER
CSP A--013
Landing Gear Controls
Figure 16---20---4
Landing Gear
Control Lever
Down Lock
(lever solenoid)
Used to prevent
inadvertent landing
gear up selection
when on ground.
When airborne, a
WOW signal
completes a circuit
which disengages
the lock and permits
gear up selection.
Landing Gear Control Panel
Centre Instrument Panel
Landing Gear
Control Lever Down
Lock Release Lever
Used if there is a
fault in the solenoid
release circuit.
Move switch down
and hold down to
manually override the
LDG GEAR control
lever solenoid lock.
LDG GEAR
BTMS OVHT HORN
WARN RESET
OFF
ARMED
ANTI SKID
DN LCK
REL
OVHT TEST
WARN FAIL
MLG BAY
OVHT
UP
DN
MUTED
TEST
Landing Gear Lever
Controls retraction and
extension of the landing
gear. Lever must be
pulled out to be moved
to alternate position.
UP -- Retracts landing gear.
DN -- Extends landing gear.
Mute Horn
Switch/Light
Mutes landing gear
warning horn. White
light will come on to
indicate that landing
gear warning horn
has been mute.
Vol. 1 16--20--7
REV 56, Jan 31/03
LANDING GEAR
Nose and Main Landing Gear
Flight Crew Operating Manual
CSP A--013
MASTER
Landing Gear Manual Release
Figure 16---20---5
Landing Gear Manual Release Handle
Center Pedestal
MANUAL
RELEASE
LANDING
GEAR
PUSH FULLY TO STOW button (red)
Used to reset the manual release system
(stow the LG PULL handle):
Hold handle, press button and then slowly
return handle to the stowed position.
LANDING GEAR MANUAL RELEASE
handle (red)
Used to manually lower the landing gear:
Pull handle and hold handle in the fully
extended position until EICAS indicates the
nose and main landing gear are in the
down and locked position.
NOTE
Considerable force is required to
operate the landing gear manual release
system. N
REV 56, Jan 31/03
Vol. 1 16--20--8
LANDING GEAR
Nose and Main Landing Gear
Flight Crew Operating Manual MASTER
CSP A--013
Landing Gear Retraction and Extension --- Schematic
Figure 16---20---6
LDG GEAR
UP
DN
DN LCK
REL
LG PULL
ACCUMULATOR
NO.2 HYDRAULIC
SYSTEM
ACCUMULATOR
NLG DOORS
SELECTOR
VALVE
NLG DOORS
DUMP VALVE
NLG DOORS
CAM LOCK
NLG
UPLOCK
NOSE LANDING
GEAR SELECTOR
VALVE
NOSE LANDING
GEAR DUMP
VALVE
NOSE LANDING
GEAR ACTUATOR
BRAKE CONTROL
VALVES
NOSE WHEEL
STEERING
NLG
DOWNLOCK
PSEU
MAIN GEAR
SELECTOR
VALVE
MAIN GEAR
DUMP VALVE
LH MAIN GEAR
ACTUATOR
LH MAIN GEAR
UPLOCK
LH MAIN GEAR
DOWNLOCK
ASSIST
ACTUATOR
RH MAIN GEAR
ACTUATOR
RH MAIN GEAR
UPLOCK
RH MAIN GEAR
DOWNLOCK
ASSIST
ACTUATOR
MAIN GEAR
DOWNLOCK
ASSIST
SELECTOR
VALVE
NO.3 HYDRAULIC
SYSTEM
LANDING GEAR
MANUAL
RELEASE
HANDLE
LANDING
GEAR
CONTROL
CENTRE
INSTRUMENT
PANEL
CENTRE
　
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