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 8.  Retractable Side Door Guide/Restraint Rails (Fig. 1)
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 A.  Two retractable guide/restraint rails span the opening of side door cargo transfer area on the left side of the compartment to permit the loading and unloading of cargo units. Each rail contains retractable side lock restraints, rail support release handles and cargo tiedown fittings. The side lock restraints are extended and retracted by lowering and raising the side lock release handles located outboard of the rail. The rails attach to rail supports secured to the seat tracks and floor fittings. Removal of the rails from the rail supports is accomplished by rotating each release handle outboard to disengage retaining pins from the rails. The rails are hinge linked to guide rails located just forward and aft of the side cargo door opening. Quick-release pins are provided for rapid disengagement of the retractable guide/restraint rails from the hinge link fittings installed on the guide rails located forward and aft of the door opening.
 9.  Retractable Side Door Rollout Guide/Stops (Fig. 1)
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 A.  Five retractable rollout guide/stops span the opening of the side door cargo transfer area on the left side of the cargo compartment. During cargo loading operations the guide/stops are extended. With the guide/stops extended, they are forced down as a cargo unit is loaded thru the side door opening and then re-extend after the cargo unit has passed over them to prevent cargo unit from inadvertently rolling back out of the airplane. The guide/stops are located beneath the retractable side door guide/restraint rails. Each guide/stop contains a stowage lock plunger release lever, retraction trigger and guide/stop head. The stowage lock plunger release lever located on aft end of the guide/stop when operated releases guide/stop head to the extended position. Retraction of the guide/stop head is accomplished by pushing down on the retraction trigger located outboard of the guide/stop. Operation of rollout guide/stops requires side door guide/restraint rails be folded forward and aft of the side door opening.
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 25-58-00
 ALL  ú ú 01B Page 14 ú Oct 10/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400
MAINTENANCE MANUAL

 10. Side Door Sill Roller/Caster and Guide Assembly (Fig. 1)
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 A.  A sill assembly spans the opening of the side door cargo transfer area on the left side of the cargo compartment to facilitate the transferring of cargo units into and out of the airplane. The sill assembly consists of a forward and aft sill containing casters, rollers and retractable side guides. The outboard section of each sill folds onto the inboard section of each sill to the stowed position. Retractable side guides when extended provide guidance for cargo units transferring into and out of the cargo compartment and must be retracted prior to stowing the outboard sill sections.
 11. Retractable Center Guide/Restraints (Fig. 1)
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 A.  Retractable center guide/restraints are installed along the centerline of the cargo compartment to provide guidance and restraint of 88 and/or 96-inch wide cargo units. Each center guide/restraint contains casters or rollers (except in side door cargo transfer area) which serve as part of the conveyor system, two pushdown guide/restraints for restraining 88-inch wide cargo units , and one retractable center guide/restraint for restraining 96-inch wide cargo units. The pushdown and center guide/ restraints contain vertically mounted rollers for guiding cargo units and swiveling vertical restraints which are spring centered to pivot automatically out of the way when contacted by interferring cargo units.
 12. Retractable Centerline Bumper (Fig. 1)
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 A.  A retractable centerline bumper is to give protection for the retractable center guide/restraints installed aft of the bumper. The centerline bumper is shock-absorber mounted and is retracted during handling of 96x238.5-inch long (20 foot) cargo units. Retraction of the bumper is accomplished by operation of the latch release lever located on top of the bumper.
 13. Lock/Stop Roller-Caster Trays (Fig. 1)
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 A.  Three rows of lock/stop roller-caster trays are installed along the entire length of the cargo compartment on each side of the airplane centerline. Locks and stops are intermittently spaced throughout the length of the trays to provide longitudinal and vertical restraint for the cargo units. Three locks and/or stops restrain the forward and aft ends of each cargo unit and may be relocated in 1-inch increments throughout the tray length for differing lengths of cargo units. Rollers and casters serve as part of the conveyor system and may be relocated in 1-inch increments throughout the length of the tray.
　
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