25-53-16
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A

747-400 MAINTENANCE MANUAL
DOORSILL ROLLER (6 LOCATIONS)
SEE A
CARGO
DOOR
OPENING

FWD FORWARD COMPARTMENT
DOORSILL ROLLER (6 LOCATIONS)
SEE A
CARGO
DOOR
OPENING

BALL TRANSFER
PANEL (REF) DOORSILL ROLLER
BALL UNIT
BOLT 
0.07 (+0.04/-0.05)  (2 LOCATIONS) 
INCH 
FWD  AFT COMPARTMENT  SHIMS 
SUPPORT 
BOLT  BRACKET 
(2 LOCATIONS) 

DOORSILL ROLLER A Doorsill Roller InstallationFigure 401
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747-400 MAINTENANCE MANUAL
 S 034-006
 (2)  
Remove the four bolts which attach the doorsill roller to the structure.

 S 024-007

 (3)  
Remove the doorsill roller.

 NOTE:____There are shims below the doorsill roller. Keep the shims with the doorsill roller.
 TASK 25-53-16-404-009
 3.  Doorsill Roller Installation (Fig. 401)____________________________
 A. Special Tools and Equipment
 (1)  3PRE65B00040 Lower Cargo Door Opening Safety Barrier
 B. Consumable Materials
 (1)  A00247 Sealant - BMS 5-95
 C. References
 (1)  
24-22-00/201, Manual Control

 (2)  
52-34-00/001, Forward/Aft Cargo Doors

 (3)  
IPC 25-53-16

 D. Access
 (1)  Location Zone
 100 Lower Half of Fuselage

 E. Procedure
 S 424-028
 (1)  
Put the doorsill roller with the shims in its position on the structure.

 S 434-027

 (2)  
Install the four bolts which attach the doorsill roller to the structure but do not tighten them.

 S 224-029

 (3)  
Measure the distance from the top of the doorsill roller to the top of the ball units.

 NOTE:____The ball units are in the adjacent ball-transfer panels. The distance must be 0.07 (+0.04/-0.05) inches.
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747-400 MAINTENANCE MANUAL
 S 824-030
 (4)  
If the distance is not 0.07 (+0.04/-0.05) inches, adjust the thickness of the shims.

 S 434-031

 (5)  
Tighten the four bolts.

 S 394-032

 (6)  
Apply the sealant around the bolts to make a seal.

 S 714-033

 (7)  
Make sure the doorsill roller turns freely.

 F. Put the Airplane Back to Its Usual Condition
 S 094-021
 (1)  
Remove the safety barrier (3PRE65B00040) from the opening of the cargo compartment if it is not necessary.

 S 414-022

 (2)  
Close the cargo compartment door (Ref 52-34-00/001).

 S 864-023

 (3)  
Remove the electrical ground power if it is not necessary (Ref 24-22-00/201).

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747-400 MAINTENANCE MANUAL
 CARGO HANDLING CONTROL PANELS - REMOVAL/INSTALLATION
____________________________________________________
 1.  General_______
 A.  There are two tasks in this procedure. The first task is the removal of the cargo handling control panels. The second task is the installation of the control panels.
　
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