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 B.  The access door is constructed of clad aluminum material. It is hinged on one side and latched on the opposite side by a sliding pin. The two hinge arms extend from door structure to engage hinge fittings, one on the forward face of sta 820 frame and one on the aft face of station 800 frame. These hinges are designed to allow forward and aft, inward and outward adjustment for proper door alignment. A continuous seal around the periphery of the door prevents loss of cabin air when the airplane is in flight. Pressurization loads on the door are transmitted to the fuselage by two stop fittings on both the forward and aft edges of the door, which bear against pads attached to the fuselage structure surrounding the door. The sliding pin latch activates the door warning system.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

UPPER TRACK ROLLER DETENT
SEE  A 
ROLLER ASSEMBLIES (4 PLACES)  KEEPER FITTINGS (4 PLACES) 
A 
SEE  C 

SEAL 
NOTE:____  LEFT LATCH PIN ACTUATES DOOR SEE D WARNING SWITCH.  FWD  A  INBD  LATCH PIN (4 PLACES) DOOR STOP FITTING (4 PLACES) SEE B 
A 
PINION  INTERNAL OPERATING HANDLE  DOOR STOP PIN LATCH 

EXTERNAL
RACK  KEEPER FITTING
OPERATING
(ATTACHED TOHANDLE FUSELAGE
A-A
STRUCTURE)
Main (Forward) Electronics Bay External Access Door Figure 4 (Sheet 1)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 
747-400 
MAINTENANCE MANUAL 
FUSELAGE  DOOR STOP 
STRUCTURE 

LATCH PIN 
SEAL  DOOR 
B 
TRACK ROLLER ASSEMBLY  DOOR 
LOCKNUT (2 PLACES) 
HINGED ACTUATOR 
LATCH PIN (LEFT)  C 

DOOR WARNING SWITCH MAIN ELECTRONICS BAY DOOR
D
Main (Forward) Electronics Bay External Access Door Figure 4 (Sheet 2)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 747-400 MAINTENANCE MANUAL
SECTION 42
A
HINGE ARMSEE A
WING-TO-BODY FAIRING
HOLD-OPEN
A
FITTINGLATCH PIN
DOOR STOP (4 LOCATIONS) WL
118.0
FWD DOOR
A
INBD
DOOR IN OPEN AND SECURED POSITION
LATCH
KEEPER

LATCH PIN OPERATINGTEFLON BUMPER SHAFT
DOOR WARNING EXTERNAL DOOR SKINSWITCH SEAL OPERATING HANDLE
DOOR IN CLOSED AND LOCKED POSITION
A-A

Center Electronic Bay External Access Door
Figure 5

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

 C.  The door latching mechanism (Section A-A, Fig. 1) consists of an operating shaft connected to a pin latch which protrudes through the edge of the door to engage with a latch keeper on the adjacent structure. The operating shaft has an outside handle recessed flush with the exterior skin. Should the airplane interior be pressurized with the door in the closed position and accidentally unlatched, the four stop fittings contact the structural stops and prevent further movement of the door. Access openings on the door inner surface provide entry to the door internal mechanism.
 6.  Operation
_________
　
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