500  Cargo Compartment Door Installation 
Feb 15/77  Figure 401 (Sheet 2)  52-31-0 
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

Cargo Compartment Door Installation  500 
52-31-0  Figure 401 (Sheet 3)  May 15/69 
Page 404 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

500  Cargo Compartment Door Installation 
Feb 15/77  Figure 401 (Sheet 4)  52-31-0 
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

B.  Install Cargo Compartment Door
NOTE:  Door being installed must have already been fitted to airplane.
(1)  
Apply organic corrosion inhibiting compound to door hinge areas, under scuff plates, and lower 3 to 4 inches of door interior per instructions in 51-21-91.

(2)  
Insert door through opening into cargo compartment.

(3)  
Connect hinge arms (2, Fig. 401) to door as follows:

(a)  
Examine hinge attach bolts and nuts prior to installation.  If bolt threads show evidence of bottoming out, the nut should be checked for damaged thread and replaced if necessary along with a proper bolt.

NOTE:  Variations in shim thickness between the hinge fitting and door necessitate selective bolt length dependent on amount of stackup. Use of proper length bolts ensure the integrity of the hinge attachment.

(b)  
Install shims removed in step 3.A.(8) between hinge arms (2) and door; connect hinge arm to door with bolt (3). 1) After installation, if any bolt is loose or not clamping hinge fitting securely to

door, the bolt should be removed and checked for proper grip length. If bolt does not fully engage locking feature of nut, a longer bolt should be installed.
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(4)  
Position door on door support brace and connect snubber (16) to bracket on door with  bolt (17). Check that the snubber restrains the free fall of door from the open position.

WARNING:  TO AVOID INJURY TO PERSONNEL WORKING ON OR NEAR THE DOOR, ALWAYS USE THE RED COLORED DOOR SUPPORT BRACE TO HOLD DOOR OPEN WHEN BALANCE MECHANISM AND SNUBBER ARE DISCONNECTED.

(5)  
Pull 8 to 10 inches of balance mechanism cable from door and place clamp on cable to prevent retraction.

(6)  
Connect balance mechanism cable (12) to cable clip (15) on overhead floor beam (1). Remove clamp from cable.

(7)  
Connect door lanyard assembly (14) to door or to floor beam.

(8)  
Install latch support clip (13) on overhead floor beam (1). The clip was removed as a safety precaution.

4.  Installation, New Cargo Compartment Door
A.  Prepare for installation.
(1)
The following items must be removed from old door for installation on new door.

(a)  
Door lanyard assembly.

(b)  
Door balance mechanism (Ref 52-31-11).

(c)  
Doorstops (2 places) on lower edge of aft door only.

(d)  
Doorstop pins and lock springs 12 places on forward door,10 places on aft door.

(e)  
Door seals and door up-latch.

(2)  
Install door up-latch (11, Fig. 401) on new door.

NOTE:  The latch hook bracket is provided with slotted holes to allow adjustment of the up-latch hook per step B.(16).

(3)  
Install doorstops (two places) on lower edge of aft door only.

(4)  
Install stop pins 10 places on aft door, 12 places on forward door (detail C).

NOTE:  Install stop pins with thin coating of MIL-C-16173, Grade 2, corrosion preventive compound on both internal and external surfaces of mating threads.

(5)  
Remove roller stop fittings, serrated plates and shims (detail A) from doorframe, two places. Collect and tag shims for reinstallation.

NOTE:  Door warning switch must be disconnected from forward roller stop fitting.

(6)  
Remove centering pads and shims from doorframes two places (detail B).

(7)  
Apply organic corrosion inhibiting compound to door areas per par. 3.B.(1).

(8)  
Apply a 0.12 inch fillet of sealant between the inboard edge of the door stop pin and the door stop fitting.

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