before the internal stops touch each other.
 EXAMPLE:_______Assume there is 1 turn. 3 turns minus 1 turn equals 2 turns. Thus, adjust the switch to operate 2 turns sooner.
 S 865-037
 (24)
 Close and latch the cargo door.

 S 415-032

 (25)
 Install the cargo door lining, ceiling and sidewall as it is necessary (Ref 25-52-01/401).

 S 865-038

 (26)
 Remove the electrical power if it is not necessary (Ref 24-22-00/201).

 TASK 52-34-00-705-039
 4.  System Test - Cargo Door Operating Mechanism____________________________________________
 A. General
 (1)  This is a check of the manual and electric door operating and sequence mechanisms, and switches.
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747-400
MAINTENANCE MANUAL

 (2)  
For a fast check to find unserviceable conditions of the forward or aft cargo door systems, refer to 52-34-00/601.

 (3)  
The airplane must be on its gear with no supporting jacks installed and with an operating weight of zero.

 (4)  
This procedure is for the forward cargo door. The procedure for the aft door is equivalent.

 B.
Standard Tools and Equipment

 (1)  
Scale - Push Pull (0-75 lbs)

 (2)  
Speed Wrench - 1/2-inch drive

 (3)  
Torque Wrench - 30-40 pound inches

 C.
References

 (1)  
12-21-04/301, Doors Servicing

 (2)  
24-22-00/201, Manual Control

 (3)  
52-09-00/801, Door Seals

 (4)  
AIPC 52-34-09 Fig. 1, AIPC 52-34-09 Fig. 2

 (5)  
SSM 52-34-01, 52-35-01

 (6)  
WDM 52-71-01, 52-71-11

 D.
Access

 (1)  
Location Zone 122 Forward Cargo Container Compartment, Forward Half 142 Aft Cargo Container Compartment

 (2)  
Access Panel
 821R Door - Forward Cargo Compartment
 822R Door - Aft Cargo Compartment

 E.
Procedure

 S 865-024
 (1)  
Supply electrical power (Ref 24-22-00/201).

 S 865-025

 (2)  
Make sure the circuits breakers are closed for the applicable cargo door, as follows:

 (a)  
P59 Aft Equipment Panel
 1) AFT CARGO DOOR POWER UNITS

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 (b)  P414 Power Distribution Center - Left 1) 414A21 LOWER CARGO DOOR FORWARD 2) 414F15 CARGO DOOR CONTROL FORWARD 3) 414F16 CARGO DOOR CONTROL AFT 4) Make sure the applicable cargo door is closed, latched and
 locked.
 S 735-026
 (3)  
Cargo Door - Test

 (a)  
Look at the door synoptic page on the EICAS display.

 (b)  
Make sure there is not a box adjacent to the applicable cargo door on the door synoptic page.

 (c)  
Make sure the applicable caution messages do not show on the EICAS display: 1) DOOR FWD CARGO 2) DOOR AFT CARGO.

 (d)  
Make sure the applicable status messages do not show on the EICAS display: 1) DOOR FWD CARGO 2) DOOR AFT CARGO

 (e)  
With the door closed, push the trigger on the master latch lock handle.

 (f)  
Make sure the applicable caution message shows on the EICAS display: 1) DOOR FWD CARGO 2) DOOR AFT CARGO.

 (g)  
Look at the door synoptic page on the EICAS display.

 (h)  
Make sure there is a box adjacent to the applicable cargo door on the door synoptic page.

 (i)  
Make sure the green LATCHES CLOSED light on the external door control panel is on.

 (j)  
Push 1/2 to 1 inch from the top end of the master latch lock handle with a spring scale.
　
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