*
AIMS
*
Air data inertial reference unit (ADIRU) on battery relay
*
APU external shutdown
*
ATC control panel
*
Automatic direction finder (ADF) receiver(2)
*
Brake status lights
*
Brouter
*
Center system tail and wing flight control shutoff valves
*
Cockpit voice recorder control panel
*
Distance measuring equipment (DME) interrogator (2)
*
Drain line valve (2)
*
Drain mast heater (2)
*
HF communication (HF) transceiver (2)
*
Multi-mode receiver (MMR) (3)
*
Jettison nozzle valve (2)
*
Landing gear lever lock
*
Maintenance access terminal (MAT)
*
Radio altitude (RA) transceiver (3)
*
Traffic alert and collision avoidance system (TCAS)
computer
*
VOR/MB receiver (2)
*
Water drain line hose heater thermostat
*
Wing root landing light heating
*
Window heat control unit (WHCU) (2)
*
Weather radar (WXR) transceiver (2).
WOW Card Inputs
The WOW cards get inputs from:
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Page 5 D633W101-BEJ Sep 05/2002
AIR/GROUND SYSTEM -INTERFACES
*
AIMS (time and date, flight phase/leg, airplane registration number, ICAO code)
*
Bus power control unit (external power available)
*
ELMS (air/ground relay status)
*
Ground test enable switch
*
Load sensors
*
Radio altitude (RA) transceiver (3).
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777 AIRCRAFT MAINTENANCE MANUAL
AIR/GROUND SYSTEM -INTERFACES
EFFECTIVITY BEJ ALL 32-09-00
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D633W101-BEJ Jan 05/2002
AIR/GROUND SYSTEM -WOW LOAD SENSOR
Purpose
The load sensors measure the load on the main landing gear beams to find when the airplane has weight on wheels.
Location
Two load sensors are on each main landing gear (MLG) beam. The load sensors attach to mounting brackets. Covers supply protection to the sensors. These covers attach to the MLG beam.
Functional Description
The load sensor is a variable reluctance strain measurement device.
The sensor has two pieces which attach by mounting brackets to the MLG beam structure in two places. The two pieces move independently as the MLG beam bends.
One piece has a target and the other piece has two coils. The target and coils do not touch each other.
These two pieces connect by a flexible bellows.
In the air mode, the MLG beam is in an unloaded condition and the sensor target is in the in-air position.
In the ground mode, airplane weight causes the MLG beam to bend. This changes the distance between the target and the coils and causes the target to be in the on-ground position.
The load sensor sends an analog signal to the WOW cards.
Training Information Point
You remove a panel from the bottom of the wing to get access to the load sensors. The panel attaches to the MLG beam and the spoiler beam.
A cutout in the spoiler beam lets you see the load sensors.
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777 AIRCRAFT MAINTENANCE MANUAL
AIR/GROUND SYSTEM -WOW LOAD SENSOR
EFFECTIVITY BEJ ALL 32-09-00
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D633W101-BEJ Jan 05/2002
AIR/GROUND SYSTEM -WOW CARDS AND AIR/GROUND RELAYS
Purpose
Two WOW cards get the weight-on-wheels signals from the WOW sensors. The WOW cards then send air/ground data to other airplane systems. The WOW cards also control master air/ground relays in ELMS.
Air/ground relays get the signals from the WOW cards and supply air/ground analog signals to other aircraft systems.
Location
The right WOW card is in the P84 systems card file in the main equipment center. The left WOW card is in the P85 systems card file in the main equipment center.
The air/ground relays are in the ELMS P110, P210, and P310 power management panels (not shown) in the main equipment center.
Training Information Point
The WOW cards are electrostatic sensitive.
The WOW cards are software loadable. See chapter 45-10-00 for more information.
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