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The target is near the sensors when the MLG truck is tilted between 10 and 13 degrees forward wheels up ( TILT position). The target is in the far position when the MLG truck is less than 10 degrees forward wheels up (UNTILT position).
The PSEU supplies a signal that the airplane is on the ground.
Training Information Point
The sensor assemblies on the forward part of the MLG truck are different than the sensor assemblies on the aft part of the truck.
The truck tilt sensors are LRUs. There is no adjustment of the sensors or the target after replacement.
The primary flight computers (PFCs) use the truck position signal to operate the auto speedbrakes. The brake system control unit (BSCU) uses the same signal to operate the autobrakes.
EFFECTIVITY BEJ ALL  32-61-00 
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LG POSITION INDICATING AND WARNING SYSTEM -MLG TRUCK TILT PROXIMITY SENSORS

EFFECTIVITY BEJ ALL  32-61-00 
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D633W101-BEJ  Jan 05/2002 

LG POSITION INDICATING AND WARNING SYSTEM -MLG TRUCK TILT PRESSURE SENSORS

Purpose
A truck tilt pressure sensor for each of the MLG truck tilt actuators sends truck tilt pressure data to the HYDIM cards. The HYDIM cards send a high pressure signal to the AIMS when the truck tilt pressure is more than 2500 psi. The HYDIM cards send a low pressure signal when the truck tilt pressure is less than 2400 psi. The AIMS sends these signals to the primary flight control computers (PFCs) to operate the auto-speedbrakes.
Location
The MLG truck tilt pressure sensors are above the MLG truck near the main landing gear beam.
EFFECTIVITY BEJ ALL  32-61-00 
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LG POSITION INDICATING AND WARNING SYSTEM -MLG TRUCK TILT PRESSURE SENSORS

EFFECTIVITY BEJ ALL  32-61-00 
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D633W101-BEJ  Jan 05/2002 

LG POSITION INDICATING AND WARNING SYSTEM -MLG SEMI-LEVER GEAR PROXIMITY SENSOR

Purpose
Two semi-lever gear (SLG) sensors monitor the hydraulic struts on the left and right main landing gear. These sensors provide input to the PSEUs.
Physical Description
The semi-lever gear proximity sensors are flange mount inductance-type sensors.
Location
There is one semi-lever gear (SLG) sensor on each main landing gear hydraulic strut. The sensor is located at the top of the hydraulic strut.
Functional Description
The hydraulic strut allows the MLG truck to tilt the forward wheels up ( TILT position) at landing and take-off. The hydraulic strut is LOCKED into the tilt position only at take-off.
The SLG sensor monitors a target that is inside the hydraulic strut near the top of the cylinder. The target remains separated from the top of the cylinder except at take-off. At the take-off the lockup piston is hydraulically moved upwards to lock the strut in the truck tilted position. The upward movement of the lockup piston pushes the target to the top of the cylinder and the SLG sensor detects the target being near it. The sensor sends the target location data on to the PSEU.
EFFECTIVITY BEJ ALL  32-61-00 
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LG POSITION INDICATION AND WARNING SYSTEM -MLG SEMI-LEVER GEAR PROXIM

EFFECTIVITY BEJ ALL  32-61-00 
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D633W101-BEJ  May 05/2003 

LG POSITION INDICATING AND WARNING SYSTEM -NLG NOT-COMPRESSED PROXIMITY SENSORS

Purpose
Two NLG not-compressed sensors supply NLG shock strut compressed -not compressed data to the PSEUs.
Location
The sensors are on the aft side of the NLG shock strut. The targets attach to the upper torsion link.
Functional Description
When the airplane is on the ground, airplane weight compresses the nose landing gear. The NLG compressed targets are in the far position.
When the airplane is in the air, the inner cylinder of the NLG shock strut extends to move the torsion links to the not-compressed position. This moves the targets near the NLG not-compressed sensors.
The PSEUs supply NLG not-compressed sensor data to the ECS miscellaneous cards and to the equipment cooling controllers to operate the equipment cooling supply fans.
EFFECTIVITY BEJ ALL  32-61-00 
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LG POSITION INDICATING AND WARNING SYSTEM -NLG NOT-COMPRESSED PROXIMITY SENSORS

EFFECTIVITY BEJ ALL  32-61-00 
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D633W101-BEJ  May 05/2003 

LG POSITION INDICATING AND WARNING SYSTEM -INDICATIONS -EICAS DISPLAY

General
In normal operation, the EICAS display shows the position of the three landing gear with a single symbol format.
　
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