32-61-21
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
 B.
C.
D.
A
737-300/400/500MAINTENANCE MANUAL
 (b)
Size: For rectangular sensors - 1.5 x 0.75 x 0.05 inches.References

 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 29-15-00/201, Hydraulic Systems, A, B, and Standby

 (3)  
AMM 32-00-01/201, Ground Locks

 (4)  
AMM 32-61-00/501, Landing Gear Position Indicating and Warning System

 (5)
AMM 32-61-21/501, Main Gear Uplock SensorAccess

 (1)  
Location Zones 216 Left Main Wheel Well 217 Right Main Wheel Well

Install the Uplock Sensor (Fig. 401)
 S 864-011
 WARNING: MAKE SURE THE GROUND LOCKS ARE INSTALLED ON THE NOSE AND MAIN
_______ LANDING GEAR. AN ACCIDENTAL RETRACTION OF THE LANDING GEAR CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (1)  
Make sure the ground locks are installed on the nose and main landing gear (AMM 32-00-01/201).

 S 424-007

 (2)  
Do these steps to install the uplock sensor on the main landing gear:

 (a)  
If you found damage to the sensor or the adjacent area during the removal procedure, do these steps: 1) Examine the target for the sensor and the adjacent area for

 signs of possible damage. 2) If you found damage, repair or replace all damaged components or areas.
 NOTE: Damage to the sensor, the target, or the adjacent
____ areas is an indication of an incorrect sensor clearance.
 3)  If you found damage, do the adjustment procedure for the sensor clearance after you make the repairs (AMM 32-61-21/501).
 (b)  
Twist the sensor leads together.

 (c)  
Attach the line in the flexible conduit (used during the removal procedure) to the end of the sensor leads.

 (d)  
Carefully pull the sensor leads through the flexible conduit.

 (e)  
Install the mounting bolts on the sensor.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 CAUTION:_______INSTALL THE SPACERS AS TAGGED. IF YOU DO NOT INSTALL THE SPACERS AS TAGGED IN THE REMOVAL PROCEDURE, THE SENSOR CLEARANCE CAN CHANGE. AN INCORRECT CLEARANCE CAN CAUSE SENSOR DAMAGE OR INCORRECT SENSOR OPERATION.
 (f)  Install the spacers as tagged during the removal procedure.
 NOTE: If you change the installation of the spacers, a gear
____ retraction and extention procedure can be necessary.
 (g)  
Install the sensor on the mounting bracket.

 (h)  
Put the sensor in the correct position on the mounting bracket.

 (i)  
Install the washers and nuts on the mounting bolts and tighten the nuts.

 NOTE: If you replace the spacers or install them differently,
____
 do not tighten the nuts.

 (j)  
Put the twisted sensor leads into the wire bundle.

 (k)  
Attach the sensor wires to the wire bundle with a wiring clamp.

 (l)  
If it is necessary, cut the sensor leads to the correct length.

 (m)  
Replace the pins on the sensor lead ends.

 (n)  
Install the lead pins in the electrical connector.

 1)  Make sure that you installed the pins in the correct location.

 (o)  
Connect the third wire (yellow) at the ground point.

 (p)  
Connect the electrical connector.

 S 824-013
 (3)  If you have one or more of the conditions that follow, you must adjust (AMM 32-61-21/501), and do a test of the uplock sensor
___
 (AMM 32-61-00/501):

 (a)  
Damage to the sensor

 (b)  
Damage to the sensor mounting bracket or adjacent structure

 (c)  
Damage to the sensor target

 (d)  
If you changed the spacers

 S 714-014
 (4)  
If you do not have the conditions given before, do these steps to do a test of the uplock sensor:

 (a)  
Remove the DO-NOT-CLOSE tags and close all circuit breakers for the landing gear on the circuit breaker panel, P6-2.
　
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