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Continuous and periodic tests are performed by the PSEU to monitor specific aircraft
systems health and status. Landing gear position and status are displayed on the engine
indication and crew alerting system (EICAS) primary page. The landing gear position
indication is removed 30 seconds after the landing gear is in the up and locked position with
the flaps at 0 degrees.
Vol. 1 16--30--2
LANDING GEAR
Proximity Sensing System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Proximity Sensing System --- Schematic <1025>
Figure 16---30---1
OUTBD GROUND
SPOILER STOWED
PARK BRAKE
SOV CLOSED
CABIN PRESSURE
CONTROLLER
AVIONICS
COOLING SYS
CLOCK
GEAR HANDLE
DOWNLINK
SERVICE LIGHTING
FADEC L/R
FIDEEX
INBD GROUND
SPOILER STOWED
PROXIMITY
SENSORS
DATA
FLAPS/SLATS
POSITION
CABIN PRESSURE
PARK BRAKE ON
THRUST LEVERS
POSITION
NOSE GEAR
DOOR OPENED
HORN MUTE
ON
ATTITUDE HEADING
REFERENCE SYS
AIR TRAFFIC CONTROL
TRANSPONDERS 1,2
TRAFFIC ALERT
COLLISION
AVOIDANCE SYS
GROUND PROXIMITY
WARNING SYSTEM
FLIGHT DATA
RECORDER
STALL WARNING
SYS/AOA
HORIZ STAB TRIM
CONTROL UNIT 1,2
FLAP ELECTRONIC
CONTROL UNIT 1,2
HYDRAULIC MOTOR
PUMPS
ANTI SKID
INBD/OUTBD
STALL PROTECTION
SYSTEM
AIR DATA SENSOR
HEATER CONTROL UNIT
FUEL SYSTEM
COMPUTER UNIT
AUXILIARY POWER
UNIT (ECU, FIRE)
THRUST REVERSER
1,2
AIR DRIVEN
GENERATOR
AUTO DEPLOY
UTILITY BUS
SHED
IRS SYS
EICAS
P
ROXIMITY
SE
NSOR
ELE
CTRONICS UNIT
DATA
CONCENTRATOR
UNITS
INPUTS OUTPUTS
NOSE WHEEL
STEERING:
DOWN LOCK
WOW 1,2
SIGNS:
NO SMOKING
FASTEN
SEAT BELT
NOSE GEAR
SOLENOIDS:
EXTEND
RETRACT
MAIN LANDING
GEAR
SOLENOIDS:
EXTEND
RETRACT
DOOR SELECT
VALVE:
OPEN
CLOSED
COMMUNICATIONS:
COCKPIT
VOICE
RECORDER
INTERCOM
MAIN LANDING
GEAR:
WOW 1,2
DOWNLOCK 1,2
UPLOCK
NOSE GEAR:
WOW 1,2
DOWLOCK 1,2
UPLOCK
OLEO EXTEND
NOSE DOOR:
L/R CLOSED
UPLOCK
PAX DOOR:
PIN 1,2 LOCKED
CAM 1,2 LOCKED
LANDING GEAR
COMMANDS:
EXTEND
RETRACT
DOOR CLOSED:
COCKPIT EMERG
HATCH
AFT EQPT
BAY DOOR
OVERWING
DOORS LH/RH
AVIONICS BAY
SERVICE/EMERG
BAGGAGE
COMPARTMENTS
HANDLE LOCKED:
PAX DOOR
SERVICE/EMERG
BAGGAGE
COMPARTMENTS
AVIONICS BAY
DC BUS 1
DC BUS 2
BAT BUS
BAT BUS
BAT BUS
CB1--G1
CB2--G1
CB2--P1
CB2--P2
CB2--P3
PSEU CH A
PSEU CH B
WOW RELAY
PSEU CH A
PSEU CH B
SPOILER ELECTRONIC
CONTROL UNITS
Vol. 1 16--30--3
LANDING GEAR
Proximity Sensing System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Landing Gear Position Indicator <1001>
Figure 16---30---2
BRT
UP (white) -- Indicates that respective landing
gear is in the up and locked position.
DN (green) -- Indicates that respective landing
gear is in the down and locked position.
(amber) -- Indicates that respective landing
gear is in transition.
(red) -- Indicates that respective landing
gear is not safe.
-- -- (amber dashes) -- Indicates that respective
landing gear is in unknown position.
Landing Gear Position Indicator
Primary Page
Vol. 1 16--30--4
LANDING GEAR
Proximity Sensing System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Proximity Sening System EICAS Indications <1001>
Figure 16---30---3
PROX SYSTEM
PROX SYS CHAN
WOW OUTPUT
WOW INPUT
WOW INPUT caution (amber)
Indicates that two or more WOW
sensors disagree or have failed.
WOW OUTPUT caution (amber)
Indicates that WOW output failed or
disagrees with another critical output.
PROX SYS FAULT 1 status (white)
Indicates a failure of any one PSEU
input or output related to a critical
aircraft system.
PROX SYSTEM caution (amber)
Indicates loss of both PSEU channels.
PROX SYS FAULT 2 status (white)
Indicates that any one non--critical
sensor or an input or output is failed
or unreasonable.
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