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A.  Lift both locking handles to the unlocked position to disengage pins in the attachment fittings.
B.  Grasping the locking handles, pull threshold section outboard until the hinge fittings disengage from pins in the attachment fittings and remove threshold section.
C.  Remove attachment fittings from floor track No. 1.
3.  Install Threshold Sections (Fig. 401)
A.  Attach threshold section attachment fittings to floor track No. 1 adjacent to corresponding part numbered decals on cabin floor.
B.  Grasping the threshold section locking handles (in the unlatched position) place section in position to allow the hinge fittings to engage with the pins in the floor track attachment fittings.
NOTE:  The three threshold sections overlap each other and must be installed in order; the aft section first, followed by the center section and then the forward section.
C.  Press the locking handles down to the latched position to engage pins in the attachment fittings.
511 
Aug 15/73  25-56-91 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Page 401 

Main Cargo Door Threshold Assemblies Installation  511 
25-56-91  Figure 401  May 15/68 
Page 402 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

THRESHOLD ASSEMBLY - ADJUSTMENT/TEST
1.  General
A.  Adjustment/Test of the main cargo door threshold assembly consists of an adjustment to the two pallet roll-out stops mounted on the main cargo door threshold assembly center section. 
B.  These stops are raised (unlatched) during cargo pallet loading to provide pallet restraint if a pallet should move back out of the main cargo door opening before it is properly located on the system. The arm of the roll-out stop must be in the latched (down) position during cargo pallet unloading. The following adjustment procedure is made to ensure that the roll-out stop arm is properly restrained by the two ball plungers, when in the latched position.
2.  Adjust Roll-Out Stop Arm Ball Plunger (See figure 501.)
A.  Press down and position the roll-out-stop arm in the latched position.
B.  Rotate ball plungers (in or out) equally until a manual force of 7 pounds (+3 or -3) applied upwards on the arm is required to unlatch the stop.
511 
May 15/68  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  25-56-91 Page 501 

Main Cargo Door Threshold Pallet Lock Adjustment  511 
25-56-91  Figure 501  May 15/68 
Page 502 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

BARRIER NET - REMOVAL/INSTALLATION
EFFECTIVITY
Passenger/Cargo Convertible Airplanes
1. Remove Barrier Net (Fig. 401)
A.  Push in and rotate fittings at end of barrier net radial straps 60 degrees in either direction to release from fittings on fuselage structure.
B.  Swing fittings in floor forward slightly and rotate down into recess in floor. Install barrier net floor fitting coverplates.
C.  Close access on sidewall to cover fittings mounted on structure behind decorative panels.
NOTE:  Inboard end of passenger service unit spacer panel must be lowered before access door can be closed.
Upper access cover on right window panel should be slid up until spring clips engage slots in window panel.
D.  Install overhead stowage compartments, end caps and/or closure panels removed for barrier net installation (Ref 25-21-311).
E.  Install left and right forward curved ceiling panels adjacent to end cap of forward lowered ceiling (Ref 25-21-341).
2.  Install Barrier Net (Fig. 401)
A.  Provide access to barrier net fittings mounted on structure behind cabin lining.
(1)  
Slide upper access cover on right window panel down.

(2)  
Open hinged access doors on sidewall panels.

CAUTION:  OPEN DOORS FROM FORWARD SIDE TO AVOID DAMAGING DOOR PANELS. DOORS ARE HINGED AT AFT EDGE.

(3)  
Remove left and right most forward curved ceiling panels (Ref 25-21-341).

(4)  
Remove overhead stowage compartments, closure panels and/or end caps as required to provide access to fittings in stowage compartment area.

(5)  
Release fasteners and lower inboard end of passenger service unit spacer panel with access door.

Feb 15/81 25-56-112 Page 401
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

Cargo Barrier Net Installation  536 
25-56-112  Figure 401 (Sheet 1)  May 15/73 
　
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