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 (b) (c) (d) (e)  1) Do the task to adjust the sensor (3), if it is necessary.If it is necessary, cut the sensor wires to the correct length.Install new terminal lugs (8) on the sensor wire ends.Connect the sensor wires to the terminal strip with the washer (7), lockwasher (6), and nut (5).Do a check of the terminals and the wire color for the correct electrical connections.
 S 862-079
 (3)  Remove the DO-NOT-CLOSE tag and close this circuit breaker on the overhead circuit breaker panel, P7: (a) 7F23, LANDING GEAR DSP & CONT ALTN (alternate sensor) (b) 7F22, LANDING GEAR DSP & CONT PRI (primary sensor)
 S 722-075
 (4)  Do the task which does a test of the uplock sensor.
 S 862-076
 (5)  Open this circuit breaker on the overhead circuit breaker panel, P7 and attach a DO-NOT-CLOSE tag: (a) 7F23, LANDING GEAR DSP & CONT ALTN (alternate sensor) (b) 7F22, LANDING GEAR DSP & CONT PRI (primary sensor)
 S 432-078
 (6)  Continue the installation procedure:
 CAUTION:_______ MAKE SURE YOU SEAL THE ELECTRICAL TERMINALS. IF YOU DO NOT SEAL THE TERMINALS, CONTAMINATION CAN GO INTO THE JUNCTION BOXES AND CAUSE DAMAGE TO THE SENSORS.
 (a)  Seal the electrical terminals: 1) Clean the surface of the terminals with the solvent. 2) Apply a thin layer of the primer on the surface of the terminals and let the primer dry. 3) Apply the sealant on the surface of the terminals with a short bristle brush.
 (b) (c) (d)  Tighten the conduit nut (4) to the sensor (3) by hand.Install a lockwire on the conduit nut.Install the junction box cover (J18, left gear; J21, right gear).

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747-400 MAINTENANCE MANUAL
 S 862-012
 (7)  
Remove the DO-NOT-CLOSE tag and close this circuit breaker on the overhead circuit breaker panel, P7:

 (a)  
7F23, LANDING GEAR DSP & CONT ALTN (alternate sensor)

 (b)  
7F22, LANDING GEAR DSP & CONT PRI (primary sensor)

 S 862-014
 (8) Put the airplane back to the ground mode (Ref 32-09-02/201).
 TASK 32-61-21-822-038
 4.  Adjust the Uplock Sensor for the Wing Gear (Airplane Not On Jacks)__________________________________________
 A. Standard Tools and Equipment
 (1)  
Actuating Tool - (0.5 inch diameter 24 inches long) with rubber sleeve (Recommended)

 (2)  
A wood bar with a sufficient length to move the uplock mechanism (Alternative)

 B.
References

 (1)  
09-11-00/201, Towing

 (2)  
24-22-00/201, Manual Control

 (3)  
29-11-00/201, Main Hydraulic Supply System

 (4)  
32-00-30/201, Landing Gear Door Locks

 (5)  
32-09-03/501, Proximity Switch Electronics Unit

 C.
Access

 (1)  
Location Zone
 135 Wing Landing Gear Wheel Well, LH
 136 Wing Landing Gear Wheel Well, RH

 D.
Prepare for the Adjustment

 S 862-082
 (1)  Make sure there is no pressure to hydraulic system No. 4 (Ref 29-11-00/201).
 S 492-046
 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.
 (2)  Make sure that ground locks for the nose and main landing gear are installed (AMM 09-11-00/201).
 S 492-047
 WARNING:_______OBEY THE INSTALLATION PROCEDURE FOR THE DOOR LOCKS. THE DOORS OPEN AND CLOSE QUICKLY. THE MOVEMENT OF THE DOORS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (3)  Install the door locks on the main landing gear (AMM 32-00-30/201).
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747-400 MAINTENANCE MANUAL
 E. Adjust the Uplock Sensor (Fig. 202)
　
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