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A
737-300/400/500MAINTENANCE MANUAL
 (b)  
Supply electrical power (AMM 24-22-00/201).

 (c)  
Make sure that hydraulic systems A and B are not pressurized (AMM 29-15-00/201).

 (d)  
Put the control lever for the landing gear in the DN position.

 (e)  
Make sure the green lights for the main gear are on.

 NOTE: These lights are above the control lever for the landing
____
 gear.

 (f)  
Move the throttle fully forward.

 (g)  
Move the control lever for the landing gear to the UP position.

 (h)  
Put an actuator on the uplock sensor.

 NOTE: It is only necessary to put the actuator and deactuator
____
 on the sensors you replace.

 (i)  
Put a deactuator on the downlock sensor.

 (j)  
Make sure the green light for the left gear or the right gear is not on.

 (k)  
Make sure the red light for the left gear or the right gear is not on.

 (l)  
Remove the actuator from the uplock sensor.

 (m)  
Make sure the red light for the left gear or the right gear is on.

 (n)  
Remove the deactuator from the downlock sensor.

 (o)  
Move the control lever for the landing gear to the OFF position.

 (5)  
Remove electrical power if it is not necessary (AMM 24-22-00/201).

 S 864-015
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A
737-300/400/500MAINTENANCE MANUAL
 MAIN GEAR UPLOCK SENSOR - ADJUSTMENT/TEST
_________________________________________
 1.  General
_______
 A.  The main gear uplock must be in the up and locked position before you can measure the sensor clearance. With the gear up and locked, you cannot get access to the uplock sensor unless you remove the shock strut doors.
 TASK 32-61-21-825-001
 2.  Measure and Adjust the Clearance for the Main Gear Uplock Sensor
________________________________________________________________
 A.  Special Tools and Equipment
 (1)  
Airplane Jacks (AMM 07-11-11/201)

 (2)  
Ground Locks - F72735 (AMM 32-00-01/201)

 B.  
References

 (1)  
AMM 07-11-11/201, Jack Airplane

 (2)  
AMM 24-22-00/201, Manual Control

 (3)  
AMM 29-15-00/201, Hydraulic Systems A, B, and Standby

 (4)  
AMM 32-00-01/201, Ground Locks

 (5)  
AMM 32-13-11/401, Main Gear Shock Strut Doors

 C.  
Access

 (1)  
Location Zones
 216 Left Main Wheel Well
 217 Right Main Wheel Well
 310 Left Main Landing Gear
 410 Right Main Landing Gear

 D.  
Prepare to Measure the Sensor Clearance

 S 865-002
 CAUTION: OPEN THE CIRCUIT BREAKERS THAT FOLLOW BEFORE YOU DO THE TEST.
_______ IF YOU DO NOT OPEN THE CIRCUIT BREAKERS, HYDRAULIC FLUID AND PRESSURE CAN MOVE FROM SYSTEM A TO SYSTEM B.
 (1)  
Open these circuit breakers on the P6-2 panel and install DO-NOT-CLOSE tags:

 (a)  
PRIMARY LG TRANSFER VALVE CONTROL (C781)

 (b)  
SECONDARY LG TRANSFER VALVE CONTROL (C799)

 S 495-003
 (2)  Make sure the ground locks are installed in all the landing gear (AMM 32-00-01/201).
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