you during the installation.

 (g)  
Attach a pull-line to the electrical leads.

 NOTE: The pull-line will help you pull the wires for the new
____ sensor through the conduit during installation. Make sure the line is longer than the length of the conduit. You can attach something to the free end of the pull-line to stop the line at the end of the conduit.
 S 024-004
 (4)
Do these steps to remove the sensor from the mounting bracket:

 (a)  
Remove the nuts and the bolts to remove the sensor from the mounting bracket.

 (b)  
Carefully pull the sensor wires through the conduit.

 NOTE: Do not pull the free end of the pull-line out through
____
 the conduit.

 1)  Disconnect the pull-line from the sensor wires.
 (c)  Remove the sensor from the mounting bracket.
 1)  Keep the shim for the installation of the new sensor, if it is not attached to the bracket.
 TASK 32-61-51-404-005
 3.  Install the Nose Gear Down Sensor
_________________________________
 A.  Special Tools and Equipment
 (1)  
Ground Locks - F72735 (AMM 32-00-01/201)

 (2)  
Deactuator bars for the proximity sensors:

 (a)  
Material: 5052, 6061, 7075, or 2024 aluminum or sheet copper

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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.
 For round sensors - 1.0 x 1.0 x 0.05 inches.References
 (1)  
24-22-00/201, Manual Control

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

 (3)
32-00-01/201, Ground LocksAccess

 (1)  
Locations Zones 101 Control Cabin 102 Control Cabin 203 Nose Wheel Wall 204 Nose Landing Gear

Install the Down Sensor (Fig. 401)
 S 424-007
 (1)  
Do these steps to install the sensor on the mounting bracket.

 (a)
Install the shim and the sensor on the mounting bracket.

 NOTE: This step is not necessary if the shim stayed on the
____ bracket during the removal. If the shim was removed, install the same shim.
 (b)  
Do a check of the clearance between the sensor and the target. Make sure it is correct, as shown on Fig. 401. 1) If it is necessary, add or remove shims to adjust the

 clearance between the sensor and the target.

 (c)  
Make sure the target has not moved and is attached tightly to the trunnion assembly. 1) If it is necessary, adjust the target.

 S 434-008
 (2)  
Do these steps to put the sensor wires through the conduit:

 (a)  
Twist the sensor leads together.

 (b)  
Attach the pull-line that you used for the removal of the sensor to the sensor leads.

 (c)  
From the electronic equipment center side of the wheel well, carefully pull the sensor wires through the conduit.

 (d)  
If the sensor wires are too long, cut the wires to the correct length.

 (e)  
Install splices to connect the sensor wires to the airplane wires.

 (f)  
Install the third wire (yellow) at the ground connection.

 S 864-013
 (3)  
Remove the DO-NOT-CLOSE tags and close these circuit breakers on the P6 panel:

 (a)  
AURAL WARNING

 (b)  
GEAR SWITCH & ANTISKID TEST

 (c)  
LIGHTS

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 (4)  S 714-015Do these steps to do a test of the primary down sensor: (a) Supply electrical power (AMM 24-22-00/201). (b) Make sure that hydraulic systems A and B are not pressurized (AMM 29-15-00/201). (c) Make sure the control lever for the landing gear is in the DN position. (d) Make sure the green light for the nose gear is on.
　
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