B.  If you do not have the conditions given before, do these steps to do a test of the uplock sensor:
(1)  
Remove the DO-NOT-CLOSE tags and close all circuit breakers for the landing gear on the circuit breaker panel, P6-2.

(2)  
Supply electrical power (Ref 24-22-0/201).

(3)  
Make sure that hydraulic systems A and B are not pressurized (Ref 29-11-0/201 and  29-12-0/201).

(4)  
Put the control lever for the landing gear in the DN position.

(5)  
Make sure the green lights for the main gear are on.

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

(6)  
Move the throttle fully forward.

(7)  
Move the control lever for the landing gear to the UP position.

(8)  
Put the actuator on the uplock sensor.

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

(9)  
Put a deactuator on the downlock sensor.

(10)
Make sure the green light for the left gear or the right gear is not on.

(11)
Make sure the red light for the left gear or the right gear is not on.

(12)
Remove the actuator from the uplock sensor.

(13)
Make sure the red light for the left gear or the right gear is on.

(14)
Remove the deactuator from the downlock sensor.

(15)
Move the control lever for the landing gear to the OFF position.

C.  Remove electrical power if it is not necessary (Ref 24-22-00/201).
597 
32-61-21 Page 404  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Oct 20/92 

MAIN GEAR UPLOCK SENSOR - ADJUSTMENT/TEST
1. General
A.  The main gear uplock sensor must be in the up and locked condition before the sensor can be adjusted. With the gear up and locked, the uplock sensor is not accessible without removing the shock strut doors. Even when this is done, the working space is restricted.
B.  The alternative to the above procedure is to place the uplock mechanism in the up and locked condition without fully retracting the gear. This is accomplished in the following procedure which applies to both left and right gear uplock sensors.
2.  Main Gear Uplock Sensor Adjustment
A.  Equipment and Materials
(1)  Ground Lock Assemblies (Ref 32-00-01)
B.  Prepare Main Gear Uplock Sensor for Adjustment
(1)  
Check that all ground lock assemblies are installed (Ref 32-00-01).

(2)  
Jack airplane until all wheels are clear of ground (Ref Chapter 7, Jacking).

(3)  
Check that hydraulic system A and B are depressurized, (Ref 29-11-0, Maintenance Practices and 29-12-0, Maintenance Practices).

(4)  
Check that landing gear control lever is in OFF position.

C.  Adjust Main Gear Uplock Sensor
(1)  
Remove ground lock assembly from gear (Ref 32-00-01).

(2)  
Manually unlock gear.

(3)  
Manually retract gear about 45 degrees and support gear in this position with block under wheel.

NOTE:  Gear must be blocked well enough to support weight of man working on top of gear.

(4)  
Climb through other wheel well and manually rotate uplock mechanism of partially retracted gear to the up and locked condition.

(5)  
Change spacers as necessary for length to obtain required gap between sensor and sensor actuator (Fig. 501). Tighten sensor mounting bolts.

(6)  
Return uplock mechanism to unlocked condition.

(7)  
Remove support block from gear.

(8)  
Manually extend gear to the down and locked position.

(9)  
Install ground lock assemblies (Ref 32-00-01).

(10)
Test uplock sensor (Ref 32-61-0, Adjustment/Test).

(11)
Lower airplane and remove jacks (Ref Chapter 7, Jacking).

NOTE: Gear position may have to be adjusted slightly to accomplish this.
500 
May 20/82  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  32-61-21 Page 501 

Main Gear Uplock Sensor Adjustment  559 
32-61-21  Figure 501  Aug 15/76 
Page 502 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

559 
Feb 15/80  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  32-61-21 Page 503 

MAIN GEAR DOWNLOCK SENSOR - REMOVAL/INSTALLATION
1.  General
A.  The following procedure applies to both left and right gear downlock sensors.
2.  Equipment and Materials
　
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