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 A.  A service door is located on the lower center line between fuselage stations 580 and 600. Contained in the pan beneath the door are one 4.25 inch drain port and one flush port with accompanying valve control handle for the waste tank.
 B.  The door is constructed of an aluminum outer skin with brackets and bumpers attached to the inner side. It is approximately 11.00 by 13.50 inches with the 13.50 inch side centered on B.L.O. A piano hinge attaches to the forward edge. Three trigger type latches secure it in the closed position.
 7.  Pneumatic System Ground Service Access Door (Fig. 7)
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 A.  A service door, located on the underside of the fuselage just forward of the left wing gear wheel well, provides access to the pneumatic system ground connectors. The door consists of an outer aluminum panel with an inner aluminum stiffening panel, and has two hinges on the forward side and two quick-release fasteners on the aft side.
 8.  Refueling Access Doors (Fig. 8)
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 A.  Hinged access doors are installed in the lower side of the wing leading edge just outboard of the inboard nacelle to permit access to the fueling receptacles. On the left wing immediately outboard of the fuel station door is a hinged door for access to the fueling station control panel.
 9.  Operation
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 A.  Functional Description
 (1)  
Stabilizer Jackscrew Access Door (Fig. 5)

 (a)  
To open the door from the outside, the trigger is depressed allowing the handle to drop sufficiently to allow it to be grasped. The handle is then rotated down to the full open position (approximately 90 degrees). This withdraws the rollers from latched position and allows the door to be rotated open (down and forward). A stay brace holds the door in open position when desired. To lock the door in open position, the door is rotated down and forward until the upper and lower detents lock the stay brace in the extended position. To release the door, the lower detent is depressed and the door rotated closed. The upper detent will be depressed by the upper end of the lower tube.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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

747-400 MAINTENANCE MANUAL 
SEE  A 
SERVICE DOOR LAVATORY  A  (3 LOCATIONS) LATCH 
A  HINGE 

PAN  BODY STRUCTURE
A
LATCH
0.31 INCH MINIMUM
BODY STRUCTURE
A-A
Vacuum Flush System Lavatory Service Door Figure 6
K24136
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

SEE A
PNEUMATIC GROUND SERVICE CONNECTION INBD
FWD
ACCESS DOOR (TYPICAL)
A

Pneumatic System Ground Service Connection Access Door
Figure 7

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 ALL  ú ú 01 Page 10 ú Oct 10/88
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400 MAINTENANCE MANUAL
SEE A  FUELING CONTROL PANEL ACCESS DOOR
FUELING RECEPTACLE 
ACCESS DOOR 
FUELING 
RECEPTACLE 
ACCESS DOOR 
SEE  A 
HOLD-OPEN 
ARM 
A 
HOLD-OPEN 
PIN
A 

A
LATCH BOLT
STRIKER PLATE
LATCH A-A
Refueling Access Doors Figure 8
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