(4)  
Test switch per paragraph 3.

3.  Door Locked Switch Test
A.  Equipment and Materials
(1)  Test lamp or equivalent to check circuit continuity.
B.  Test Door Locked Switch
(1)  
Ensure main cargo door is closed and locked.

(2)  
Check continuity across terminals 1-2, 10-11 and 7-8 of switch. There shall be no electrical continuity across these terminals.

(3)  
Operate main cargo door external handle to unlocked position.

(4)  
Check continuity across terminals 1-2, 10-11 and 7-8 of switch. Electrical continuity shall exist across these terminals.

(5)  
Return external handle to locked position.

511 
May 15/69  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  52-32-121 Page 501 

Main Cargo Door Locked Switch Adjustment  511 
52-32-121  Figure 501  May 15/69 
Page 502 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

MAIN CARGO DOOR POSITION SWITCH - ADJUSTMENT/TEST
1. General
A.  The main cargo door position switch is installed in the center of the body doorsill and access is obtained by opening door.
2.  Door Position Switch Adjustment
A.  Adjust Door Position Switch (Fig. 501).
(1)  
Manually open main cargo door (Ref 52-32-0, Manual Operation).

(2)  
Remove screws from switch mounting casting, disconnect switch connector and remove switch from mounting.

(3)  
Reinstall switch mounting casting in door sill without switch.

(4)  
Place modeling clay on switch mounting to simulate switch plunger location.

(5)  
Manually close main cargo door.

(6)  
Open main cargo door and remove switch mounting casting.

(7)  
Measure the distance (x) from striker pin impression to inboard face of switch mounting casting (Fig. 501).

(8)  
Install switch in mounting casting so switch plunger is the (x) distance + 0.16 inch from inboard face of mounting casting (Fig. 501).

(9)  
Install keying washer, lockwasher and nut and firmly tighten.

(10)
Connect switch to airplane wiring and install switch mounting casting on doorsill.

(11)
Close main cargo door manually.

(12)
Test switch per par. 3.

538 
Aug 15/73  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  52-32-131 Page 501 

3.  Door Position Switch Test
A.  Test Door Position Switch
(1)  
With main cargo door closed, apply airplane electrical power and check that main cargo door circuit breaker is closed.

(2)  
Check that the main cargo door unlocked light is extinguished.

(3)  
Open cargo door normally.

(4)  
Check that the main cargo door unlocked light illuminates.

(5)  
Close main cargo door

Door Position Switch Adjustment  517 
52-32-131  Figure 501  Jan 15/71 
Page 502 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

MAIN CARGO DOOR LOCKPIN NO. 3 AND 6 SWITTCHES - ADJUSTMENT/TEST
1. General
A.  Two lockpin switches are mounted on the cargo door; one at lockpin No. 3 and one at lockpin No. 6, with the switch plunger located in line with the respective lockpin. Remove door lining for access (Ref 52-32-81, Removal/Installation).
2.  Adjust Main Cargo Door No. 3 and No. 6 Lockpin Switches (Fig. 501)
A.  Ensure that main cargo door and lock mechanism is properly rigged (Ref 52-32-11,
Adjustment/Test).

B.  Adjust No. 3 or No. 6 lockpin switch so that plunger is depressed by the lockpin as specified in Fig. 501.
C.  Tighten adjustment nuts.
D.  Test switch per par. 3.
3.  Test Main Cargo Door No. 3 and No. 6 Lockpin Switches (Fig. 501)
A.  With electric power on 28-volt ac bus No. 2, close MAIN CARGO DOOR CONTROL circuit breaker on P6 panel.
B.  Operate cargo door to closed and latched position.
C.  Check that lockpin viewing lights at latch viewing windows No. 2 and 7 are illuminated (this provides indication that lockpin switches No. 3 and 6 have been depressed by the respective lockpins and are functioning properly). Check that main cargo door warning light on annunciator panel is not illuminated.
D.  Operate main cargo door external handle to unlocked position. Check that door warning light on annunciator panel is illuminated and No. 3 and 6 lockpin lights are extinguished.
　
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