K87566
Cargo Carrying System 554
25-56-0 Figure 1 Nov 01/75
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
2. Cargo Carrying System Components (Fig. 2)
A. Transfer Panels, or Ball Mats
(1) Transfer panels or ball mats, are installed on floor tracks opposite main cargo door. Each panel is provided with a series of balls which allow low friction movement of pallets in any direction across surface of ball mat area. For personnel safety, the balls are spring-mounted so that if a man treads on any individual ball it will depress and allow his foot to contact the panel surface.
B. Roller Trays
(1) Roller tray assemblies are attached to four center floor tracks (No. 3, 4, 5, and 6) throughout cargo carrying area, beginning aft of main cargo door, to enable low friction movement of cargo pallets to or from the door. Each assembly consists of a number of rollers mounted in a channel section. All roller trays are similar in design and method of attachment to floor tracks, but vary in length according to number of rollers installed in each tray.
C. Lateral Movement Restraint Assemblies
(1)
Cargo pallets are restrained from lateral movement by a series of components along the sides of the system. These components consist of guide rail assemblies, retractable side guides, and side restraint guides.
(2)
Guide rail assemblies are installed in forward main cabin area (No. 1 and 2 pallet positions), three on right-side floor track No. 7, and one on left-side floor track No. 2 immediately aft of main cargo door. Each guide rail assembly consists of three side restraint guides attached to a common rail section. The two forward right-side guide rails have ball rollers. The two aft guide rails have cylindrical rollers. Each guide rail assembly is furnished with three vertical restraint lips which can be retracted to accommodate a 9G pallet and which are similar to those on the side restraint guides.
(3)
Retractable side guides are set in voids in No. 1 transfer panel and attached to floor track No. 2 and keyhole-slotted anchorplates in cabin floor. Guide rails of retractable side guide assemblies are raised after cargo pallets No. 1 and 2 are installed to restrain lateral movement of pallets towards left side of cabin. Each retractable guide rail is equipped with a vertical restraint lip. This should be extended when guide rail is extended for normal use of the 3G system; it should only be retracted to accommodate a 9G pallet, or when the guide rail is itself retracted.
554
Nov 01/75 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 25-56-0 Page 3
K87571 K87577 K87582 K87588
Cargo Carrying System Components 554
25-56-0 Figure 2 (Sheet 1) Nov 01/75
Page 4
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
554 Cargo Carrying System Components
Nov 01/75 Figure 2 (Sheet 2) 25-56-0
Page 5
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Cargo Carrying System Components 554
25-56-0 Figure 2 (Sheet 3) Nov 01/75
Page 6
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
554 Cargo Carrying System Components
Nov 01/75 Figure 2 (Sheet 4) 25-56-0
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
(4) Side restraint guides are attached to floor tracks No. 2 and 7 in areas of pallets No. 3 thru 7, and to keyhole-slotted anchorplates installed in cabin floor at proper intervals inboard of floor tracks. Each guide assembly consists of a base section with a cylindrical roller, short rail section, and vertical restraint lip plate attached to the rail section. Vertical restraint lip can be installed in two alternative positions: overhanging inboard face of siderail (extended) or overhanging outboard face of siderail (retracted). A detent pin is inserted in a hole in siderail to position restraint lip when extended or retracted.
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