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A.  Ground Lock Assemblies (Ref 32-00-01)
3.  Prepare Main Gear Downlock Sensor for Removal
A.  Check that external electrical power supply is shut down.
B.  Open all circuit breakers on landing gear circuit breaker panel P6.
C.  Check that ground lock assemblies are installed in all landing gear (Ref 32-00-01).
4.  Remove Main Gear Downlock Sensor
A.  Remove sensor and sensor cover from mounting bracket (Fig. 401).
B.  Disconnect electrical connector on wheel well ceiling. Remove sensor pin contacts from connector insert.
NOTE: Mark or record pin location of color coded leads for installation of new sensor.
C.  Remove third wire from ground point.
D.  Tie a line to electrical leads to facilitate installation and pull leads out of flexible conduit. Do not pull line out of conduit.
E.  Untie line and remove sensor from airplane.
5.  Install Main Gear Downlock Sensor
A.  Twist sensor leads together, tie a line to the end and thread them through the flexible conduit (Fig. 401).
504 
May 20/82  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  32-61-31 Page 401 

Main Gear Downlock Sensor Installation  500 
32-61-31 Page 402  Figure 401 (Sheet 1) BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Nov 15/68 

F03274
504  Main Gear Downlock Sensor Installation 
Aug 01/95  Figure 401 (Sheet 2) BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  32-61-31 Page 403 

B.  Position sensor and sensor cover in place on mounting bracket. Instal1 mounting bolts but do not tighten.
C.  Slide sensor on mounting bracket to obtain gap between sensor and sensor actuator as shown on detail A, Fig. 401. Tighten mounting bolts.
D.  Insert twisted sensor leads in wire bundle. Tie and clamp wire bundle.
E.  Trim sensor leads to length, install pin contacts on lead ends, and install pin contacts in connector insert in correct pin locations as noted in Par. 4.B.
F.  Ground third (yellow) sensor wire at ground point. Refer to Par. 4.C. for location.
G.  Check that landing gear lever is in the DN position.
H.  Connect electrical connector.
I.  Close all circuit breakers on landing gear circuit breaker panel P6.
J.  Apply electrical power to airplane.
K.  Check that all landing gear green lights are illuminated, that no landing gear red lights are illuminated and that landing gear aural warning is silent.
L.  Determine if there is a further need for electrical power on airplane; if not, shut down source.
502 
32-61-31 Page 404  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Jun 20/87 

NOSE GEAR UPLOCK SENSOR - REMOVAL/INSTALLATION
1.  General
A.  The following procedure applies to the nose gear uplock sensor.
2.  Equipment and Materials
A.  Ground Lock Assemblies - F72735 (Ref 32-00-01)
B.  Actuator bar for proximity sensors
(1)  
Material: 1020 steel per MIL-S-7952, 15-5 ph steel, or 17-4 ph steel per AMS 5643

(2)  
Size: For use on rectangular sensors - 1.5 x 0.75 x 0.050 inches

C.  Deactuator bars for proximity sensors
(1)  Material: 5052, 6061, 7076, or 2024 aluminum or sheet copper (0.05 inches thick)
3.  Prepare Nose Gear Uplock Sensor For Removal
A.  Open all circuit breakers on landing gear circuit breaker panel P6-2.
B.  Check that ground lock assemblies are installed in all landing gear (Ref 32-0-01).
4.  Remove Nose Gear Uplock Sensor
A.  Remove cover from the downlock sensor support beam.
B.  Remove the uplock sensor mounting bolts.
C.  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.
D.  Remove the sensor and the spacers from the mounting bracket.
E.  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.
F.  Disconnect uplock sensor leads from the terminal strip in the downlock sensor support beam. Note the terminal and lead wire colors for the new sensor installation.
　
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