25-57-03
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 S 494-025
 (2)  Install the safety strut for the side cargo door if it is necessary (Ref 52-32-16/401).
 NOTE: It is optional to install the safety strut.
____
 S 494-017
 WARNING: BE CAREFUL WHEN YOU ARE NEAR THE OPENING OF THE SIDE CARGO
_______ DOOR. INSTALL THE PERSONNEL SAFETY NET ACROSS THE OPENING OF THE DOOR WHEN AN ACCESS STAND OR A PLATFORM IS NOT AT THE DOOR OPENING. THE MAIN DECK COMPARTMENT IS 16 FEET ABOVE THE GROUND. INJURY TO PERSONS CAN OCCUR IF THEY FALL THROUGH THE OPENING OF THE DOOR.
 (3)  
Install the personnel safety net across the door opening if it is necessary.

 S 014-026

 (4)  
Remove the guide/restraint rails, rail supports, and rollout guide/stops adjacent to the sill assembly (Ref 25-58-02/401).

 S 864-028

 (5)
Retract the side guides on the sill assembly if they are extended.

 S 864-029

 (6)  
Fold the outboard sills on the top of the inboard sills.

 S 864-030

 (7)  
Attach the outboard sills to the inboard sills with the two
 hold-down straps.

 NOTE: The hold-down straps are at the forward and aft ends of the
____
 sill assembly.

 D. Remove the Sill Assembly
 S 034-004
 (1)  Lift the shear-plunger levers to release the sill assembly from the floor fittings.
 NOTE: There are 11 shear-plunger levers on the forward sill and the
____ aft sill. Ten of the shear-plunger levers are on the inboard side of each sill. The remaining shear-plunger lever is on the outboard side of each sill.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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 ALL  ú ú 01 Page 402 ú Feb 10/91
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747-400 MAINTENANCE MANUAL
 S 034-032
 (2)  
Move the forward sill approximately 1.5 inches in the forward direction.

 S 034-033

 (3)  
Move the aft sill approximately 1.5 inches in the forward direction.

 NOTE: The tension studs on the bottom of the aft sill must align
____ with the holes in the floor fittings.
 S 024-071
 (4)  
Remove the aft sill.

 S 034-034

 (5)  
Move the forward sill approximately 3.0 inches in the aft direction.

 NOTE: The tension studs on the bottom of the forward sill must
____ align with the holes in the floor fittings.
 S 024-072
 (6)  Remove the forward sill.
 TASK 25-57-03-404-008
 3. Sill Assembly Installation (Fig. 401)
__________________________
 A. References
 (1)  
25-58-02/401, Outboard Guide/Restraint Rails

 (2)  
52-32-00/001, Side Cargo Door

 (3)  
52-32-16/401, Side Cargo Door Safety Strut

 B. Access
 (1)  Location Zone
 210 Main Deck

 C. Procedure
 NOTE: The outboard sills must be folded on the top of the inboard sills
____
 before you install the sill assembly.

 S 434-035
 (1) Lift the shear-plunger levers to retract the shear-plunger studs.
 NOTE: There are 11 shear-plunger levers on the forward sill and the
____ aft sill. Ten of the shear-plunger levers are on the inboard side of each sill. The remaining shear-plunger lever is on the outboard side of each sill.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 25-57-03
 ALL  ú ú 04 Page 403 ú Oct 10/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
　
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