B.  The door is closed by pulling on the handle of the lanyard which releases the latch (Fig. 2). This handle is adjacent to the cargo retaining net just inside and forward of the door opening, and is accessible to personnel standing on the ground. The lanyard to which it is attached is so designed that the handle has to be pulled outside the door opening before the latch will disengage. After the latch is disengaged, a continued pull on the lanyard brings the door down until the operating handle is within reach of the operator's left hand. The handle is grasped by lifting the handle out of its recess. As soon as a firm grip is established on the operating handle, the handle of the lanyard is released and springs back to its normal position within the cargo compartment. Counterclockwise rotation of the operating handle aligns the latch rollers with their latch fittings and allows the door to be pulled down and latched by a clockwise rotation of the handle. This final movement engages both latch rollers in their fittings, actuates the door warning proximity switch de-energizing the appropriate warning light in the control cabin. When the door is thus closed and latched, the handle may be released to spring back into its recess.
WARNING:  ENSURE HANDLE ROTATION IS COMPLETE BEFORE STOWING EXTERNAL HANDLE TO ENSURE LATCHES ARE ENGAGED.
526 
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500  Cargo Compartment Door Operation 
Nov 15/66  Figure 2  52-31-0 
Page 5 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

CARGO COMPARTMENT DOORS - TROUBLE SHOOTING
1. Forward and Aft Lower Lobe Cargo Doors Trouble Shooting Chart

500 
May 15/78  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  52-31-0 Page 101 

500 
52-31-0 Page 102  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  May 15/78 

CARGO COMPARTMENT DOORS - REMOVAL/INSTALLATION
1. General
A.  The forward and aft cargo compartment doors are similar in design and operation (Fig. 401  and 402).
B.  Two procedures are given to cover the following:
(1)  
Removal/Installation of an existing cargo compartment door (Ref par 3).

(2)  
Installation of a new cargo compartment door or a door that has not been fitted to the airplane (Ref par. 4).

2.  Equipment and Materials
A.  Door support brace - 2- x 4-inch wood painted red of suitable length to support the door in open position, or equivalent
B.  C-clamp (or equivalent) to hold balance mechanism cable
C.  Corrosion Preventive Compound - MIL-C-16173, Grade 2, or equivalent (Ref 20-30-21)
D.  Organic Corrosion Inhibiting Compound - BMS 3-23 (Ref 20-30-21)
E.  Sealant - BMS 5-95
3.  Removal/Installation, Existing Cargo Compartment Door
A.  Remove Cargo Compartment Door
(1)  
Open cargo compartment door. Using the door support brace, position door as necessary to facilitate removal of equipment.

(2)  
Remove latch support clip (13, Fig. 401) from overhead floor beam (1) This is a safety precaution to ensure use of the door support brace.

WARNING:  IF DOOR BALANCE MECHANISM AND SNUBBER ARE DISCONNECTED AND DOOR IS LATCHED OPEN, THE ACCIDENTAL UNLATCHING OF THE DOOR CAN RESULT IN INJURY TO PERSONNEL AS DOOR WILL FALL TO THE CLOSED POSITION.

(3)  
Place clamp on door balance mechanism cable at inner surface of door to prevent cable from retracting when disconnected from overhead beam.

(4)  
Disconnect door balance mechanism cable from cable clip (15, Fig. 401) on overhead floor beam (1).

(5)  
Remove clamp installed on cable in step 3.

CAUTION:  CABLE IS UNDER HIGH TENSION. HOLD CABLE FIRMLY DURING REMOVAL OF CLAMP. RELEASE CABLE GRADUALLY, PERMITTING SPRINGS TO RETRACT SLOWLY.

(6)  
Disconnect lanyard assembly (14) from door or from floor beam (l).

(7)  
Disconnect snubber (16) from door by removing bolt (17).

(8)
Remove hinge bolts (3) to disconnect door from hinge arms (2).
Collect and tag shims for reinstallation.

(9)  
Remove door and door support brace through opening.

551 
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Cargo Compartment Door Installation  526 
　
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