(2)  
For emergency access to the aft cargo compartment the cabin floor access panel above the aft cargo compartment is removed. The exposed blowout panel may then be pushed down into the cargo compartment for access. The words, "Push Down for Emergency Access to Cargo Compartment" are stenciled on the upper surface of the blowout panel.

2.  Anchor Plates

A.  Anchor plates are on the sidewalls of both cargo compartments and on the aft compartment ceiling. See figure 1 for typical anchor plate locations. Each anchor plate has a flat mounting surface on one side and it has a slot and lips to receive a quick-release tiedown fitting on the other side. The anchor plates hold the outboard edges of the webbing when the webbing is in place. (See figure 2.)
B.  Each anchor plate is fastened to the body structure by two screws. The body structure that the anchor plates are fastened to will withstand a load on each anchor plate that is not greater than 800 pounds and that has no lateral component that is greater than 200 pounds. The lateral component is the component that lies parallel to the surface that the plate is fastened to and that also lies in a plane that is at right angles to the airplane’s longitudinal axis.
3.  Tiedown Tracks
A.  A pair of tiedown tracks is in the deck of each cargo compartment. The tracks run fore and aft for the full length of the compartment. The forward compartment tracks are about 32 inches apart and the aft compartment tracks are about 31 inches apart. Each pair of tracks is offset to the left with respect to the airplane’s centerline. The upper surfaces of the tracks are nearly flush with the deck panels. The tracks are fastened to the airplane body frames by lockbolts.
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

L08639 H60632
518  Cargo Compartments 
Dec 15/72  Figure 1  25-52-0 
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

Cargo Compartment Anchorplates and Webbing  518 
25-52-0  Figure 1 (Sheet 2)  Dec 15/72 
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

EFFECTIVITY
AIRPLANES NOT EQUIPPED WITH STANCHIONS

H60635
518  Cargo Compartment Anchorplates and Webbing 
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

B.  On airplanes equipped with stanchions, the upper surface of each track has stanchion sockets and tiedown holes. Six pairs of tiedown holes and two stanchion sockets are spaced along the length of each forward compartment track. Each aft compartment track has seven pairs of tiedown holes and two stanchion sockets. The two tiedown holes of each pair have their centers one inch apart. A restraining slot is between the two tiedown holes of each pair.
C.  On airplanes equipped with stanchions, the lower ends of the cargo net stanchions fit in the tiedown holes or the stanchion sockets that are in the upper surface of the track. Quick-release fasteners can also be held by the restraining slots in the spaces between tiedown holes.
D.  On airplanes not equipped with stanchions, the upper surface of each track has groups of tiedown holes spaced along the compartment for attachment of tiedown fittings. In each group, the tiedown holes are located 1 inch apart and are connected by a slot.
4.  Stanchions (Airplanes so equipped)
A.  The forward compartment has four stanchions and the aft compartment has six. The stanchions stand upright when they are in place and they reach between the deck or the sidewall and the ceiling. Figure 1 shows the locations of the installed stanchions.
B.  An aluminum tube forms the main part of the stanchion. A latch mechanism is at the upper end of the tube. The latch mechanism has a piston which can slide in or out along the axis of the tube. (See figure 2.) A spring pushes the piston toward the extended position. The upper end of the piston is shaped to match a ceiling fitting. The lower end of the stanchion has an indexing pin which fits the tiedown track holes. Loop fittings are fastened to the tube at places that are suitable for attaching the webbing.
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C.  The upper ends of the stanchions are held in place by fittings on the ceiling. The lower ends of the stanchions are held in place by the tiedown tracks or by fittings on the sidewalls.
D.  Some of the webbing straps are attached to the stanchions when the webbing is in place. A stanchion can be removed by retracting the piston at its upper end.
　
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