S 425-210
 S 845-209
 

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757 MAINTENANCE MANUAL
 MAIN GEAR PROXIMITY SENSORS - MAINTENANCE PRACTICES
___________________________________________________
 1.  General
_______
 A.  This procedure contains four tasks for the proximity sensors for the main landing gear.
 NOTE: Refer to AMM 32-09-07/201 for the tasks for the truck tilt
____
 sensors on the main landing gear.

 (1)  
The first task is for the removal of the sensor.

 (2)  
The second task is for the installation of the sensor.

 (3)  
The third task does a test of the sensor.

 (4)  
The fourth task measures and adjusts the clearance between the sensor and its target.

 B.  
All of these tasks are for the proximity sensors that follow:

 (1)  
Landing gear down and locked sensors (S10057, S10070, S10061, S10074) (Fig. 201).

 (2)  
Landing gear up and locked sensors (S10239, S10069, S10240, S10073) (Fig. 202).

 (3)  
Door closed sensors for the main landing gear (S10241, S10242, S10072, S10076) (Fig. 203).

 C.  
Usually the sensors are installed with a wire harness or conduit attached to the sensors. This does not include the landing gear up and landing gear door sensors. Put the sensor wires through the conduit when you remove or install them. On the sensors for landing gear up and landing gear doors the wires do not go through a conduit.

 TASK 32-61-02-002-001
 2.  Remove the Proximity Sensors for the Main Landing Gear
______________________________________________________
 A.  Equipment
 (1)  
Pin Insertion/Extraction Tool - MIL-C-83723

 B.  
References

 (1)  
24-22-00/201, Electrical Power - Control

 (2)  
32-00-15/201, Landing Gear Door Locks

 (3)  
32-00-20/201, Landing Gear Downlocks

 (4)  
Chapter 20, Wiring Diagram Manual

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MAINTENANCE MANUAL

 C. Access
 (1)  
Location Zones
 143 MLG Wheel Well (Left)
 144 MLG Wheel Well (Right)
 731 Main Landing Gear (MLG) (Left)
 741 Main Landing Gear (MLG) (Right)

 D.
Prepare for the Removal

 S 492-002
 (1)  
Make sure the downlocks are installed on the nose and main landing gear (AMM 32-00-20/201).

 S 492-003

 (2)  
Make sure the chocks are installed on the wheels.

 S 492-004
 WARNING:_______OBEY THE INSTALLATION PROCEDURE FOR THE DOOR LOCKS. THE DOORS OPEN AND CLOSE QUICKLY. THE MOVEMENT OF THE DOORS CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT.
 (3)  Open the doors for the landing gear and install the door locks (AMM 32-00-15/201).
 NOTE: The doors for the nose and the main landing gear open at
____ the same time when you use the ground release.
 S 862-005
 (4)  
Make sure the electrical power is removed (AMM 24-22-00/201).

 S 212-030

 (5)  
Look at the sensor, its mounting bracket and the target for signs of damage.

 (a)  
Make a record if the damage is found. This data will be used during the installation.

 E.
Remove the Proximity Sensor

 S 022-006
 (1)  
Do the steps that follow to remove the landing gear down and locked sensors (Fig. 201):

 (a)  
Disconnect the conduit electrical connector from the bracket on the rear spar.

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MAINTENANCE MANUAL

LEFT MAIN LANDING GEAR (RIGHT EQUIVALENT)
FLEXIBLE CONDUIT (REF)
MAIN LANDING
GEAR DOWN AND
LOCKED SENSORS

A
1
LEFT S10061 SYSTEM 1 LEFT S10074 SYSTEM 2 RIGHT S10057 SYSTEM 1 RIGHT S10070 SYSTEM 2 LOCK LINK ASSEMBLY (REF)
SEE  A  CONDUIT  CONNECTOR 
COUPLING  BRACKET (REF) 
NUT

INBD
FWD
LOCK
ACTUATOR
(REF)
LOCK LINK ASSEMBLY (REF) REAR SPAR (REF) ELECTRICAL CONNECTOR
A  FWD
INBD LOCK LINK ASSEMBLY (REF)
　
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