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A.  Remove the two nuts and all washers.
B.  Make a note of the locations and tag the spacers so you can install the spacers in the same location.
NOTE:  If you change the spacer configuration, the clearance between the sensor and the target can change. Adjustment of the sensor clearance requires an uplock sensor adjustment.
C.  Remove the sensor and the spacers from the mounting bracket.
D.  Examine the sensor, the mounting bracket, and the adjacent area for possible damage.
NOTE:  Damage to the sensor is an indication of an incorrect clearance between the sensor and the target.
(1)  If you find damage, make a note of the damage for the installation procedure.
E.  Remove the sensor electrical connector found on the wheel well ceiling.
F.  Make a note of the pin locations and the lead wire colors for the new sensor installation.
G.  Remove the sensor pins from the connector.
H.  Make a note of the ground point location.
I.  Remove the third wire (yellow) from the ground point.
J.  Prepare a line that is longer than the flexible conduit.
NOTE:  This line will help to install the sensor leads in the flexible conduit.
K.  Attach the line to the sensor electrical leads.
L.  Carefully remove the sensor leads from the flexible conduit.
(1)  Do not pull the line fully out from the conduit.
M.  Remove the line from the sensor leads.
N.  Remove the sensor from the airplane.
597 
Feb 20/94  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  32-61-21 Page 401 

Main Gear Uplock Sensor Installation  559 
32-61-21  Figure 401 (Sheet 1)  Aug 15/76 
Page 402 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

532 Main Gear Uplock Sensor Installation May 01/76 Figure 401 (Sheet 2) 32-61-21 Page 402A/402B BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

5. Install Main Gear Uplock Sensor
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 (Ref 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.
F.  Install the spacers as tagged during the removal procedure.
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.
NOTE:  If you change the installation of the spacers, a gear retraction and extension 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.
597 
Oct 20/92  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  32-61-21 Page 403 

6.  Adjustment and Test
A.  If you have one of more of the conditions that follow, you must adjust (Ref 32-61-21/501), and do a test of the uplock sensor (Ref 32-61-0/501):
(1)  
Damage to the sensor

(2)  
Damage to the sensor mounting bracket or adjacent structure

(3)  
Damage to the sensor target

(4)  
If you changed the spacers
　
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