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 2.  Forward Retractable Guide Rails (Fig. 1)
_______________________________
 A.  The forward retractable guide rails are for the alternate loading and unloading configuration (P1A, P2A, P2B). The guide rails are in the up position during the alternate configuration and are down for the standard configuration (P1, P2).
 B.  When the guide rails are in the up position, the "CAUTION RAILS UP" warning light flash to warn of the need to contour the P1A and P2A to prevent damage to the structure.
 3.  Guide/Restraint Rails (Fig. 1)
_____________________
 A.  The guide/restraint rails are in the nose cargo area, and are for loading and unloading of the pallets P1 and P2. These rails hold the pallets in the lateral and vertical position in the nose area.
 4.  Park Rails (Fig. 1)
__________
 A.  The park rails are on the right side of the nose cargo area. The park rails are to put the P2 or P2A pallet in the parking positions.
 5.  Directional Guide Rail (Fig. 1)
______________________
 A.  The directional guide panel installs in the forward center of the main deck cargo compartment. It contains six casters which are part of the conveyor system, and a manually moveable directional guide.
 B.  The moveable directional guide must be in the right or left position during loading and unloading operations to help in transport the cargo modules to the necessary area.
 C.  The panel is retractable below the conveyor plane to let the loading and unloading of 20FT and 40FT long cargo modules.
 6.  Restraint/Caster Units (Fig. 1)
______________________
 A.  The restraint/caster unit contains caster rollers to help in the movement of the cargo modules during loading and unloading operations, and two retractable restraints to give lateral and vertical restraint to modules parked in these positions.
 B.  The retractable restraints must be manually retracted during the movement of the cargo modules.
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A

747-400 MAINTENANCE MANUAL
FORWARD RETRACTABLE NOSE CARGO DOOR
GUIDE RAIL
SILL/ROLLER SEE A
(REF)
LOCK TRAY GUIDE/RESTRAINT RAIL
SEE E SEE B RESTRAINT/CASTER UNIT (P1-P2) SEE F PARK RAIL (P2A) SEE C
SIDE LOCK SWING RAIL
SEE L PARK RAIL (P2) SEE C
SIDE LOCK SEEM
DIRECTIONAL GUIDE RAIL
SEE N
CASTER TRAY SEE G
RETRACTABLE CENTERLINE BUMPER
SEE P
FIXED CENTERLINE BUMPER
SEE O
FORWARD SECTION
Main Deck Cargo Restraining Equipment Figure 1 (Sheet 1)
C87541
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400
MAINTENANCE MANUAL

RETRACTABLE CENTER GUIDE/RESTRAINT (WITH ROLLER)
SEE

OUTBOARD GUIDE RAIL

SEE ROLLER TRAY SEE

 

 

LOCK/ROLLER TRAY SEE

RETRACTABLE END LOCK SEE

FIXED
CENTERLINE
BUMPER

SEE

MID SECTION

Main Deck Cargo Restraining Equipment
Figure 1 (Sheet 2)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
C87542
A

747-400
MAINTENANCE MANUAL

RETRACTABLE 
CENTERLINE 
BUMPER 
SEE  P 
RETRACTABLE CENTER 
SIDE CARGO  GUIDE/RESTRAINT 
DOOR SILL  SEE  Y 
(REF) 

FIXED CENTERLINE BUMPER
RETRACTABLE CENTER GUIDE/RESTRAINT
SEE O (WITH ROLLER) RETRACTABLE
SEE W END STOP
SEE T
RETRACTABLE CENTER GUIDE/RESTRAINT (WITH CASTER)
　
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