Description and Operation 1 ALL General 1 Door - APU Battery Access 5 Door - External Power 1
 Receptacle
 Door - Pneumatic System Ground 8
 Service Access
 Door - Stablizer Jackscrew 5
 Access
 Door - Vacuum Flush System 8
 Lavatory Service
 Doors - Potable Water Service 1

 Panel Access
 Doors - Refueling Access 8
 Operation 8

 DOOR - APU BATTERY ACCESS 52-49-04 Removal/Installation 401 ALL DOOR - EXTERNAL POWER RECEPTACLE 52-49-01 Removal/Installation 401 ALL DOOR - PNEUMATIC SYSTEM GROUND 52-49-06 SERVICE ACCESS Removal/Installation 401 ALL DOOR - POTABLE WATER SERVICE 52-49-02 PANEL ACCESS Removal/Installation 401 ALL DOOR - STABILIZER JACKSCREW 52-49-05
 ACCESS Removal/Installation 401 ALL Inspection/Check 601 ALL
 52-CONTENTS
 GUN Page 11 Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 747-400 MAINTENANCE MANUAL
 CHAPTER 52 - DOORS
 TABLE OF CONTENTS
_________________
 Chapter Section Subject_______ Subject ____ Effectivity
_______ Page ___________
 DOOR - UNDERWING FUEL DRAIN 52-49-08 Inspection/Check 601 ALL DOOR - VACUUM FLUSH SYSTEM 52-49-07 LAVATORY SERVICE Removal/Installation 401 ALL DOORS - REFUELING ACCESS 52-49-09
 Maintenance Practices 201 ALL Inspection/Check 204 Removal/Installation 201
 DOOR WARNING 52-70-00
____________ DOOR WARNING SYSTEM 52-71-00
 Description and Operation 1 ALL General 1 Operation 1
 Component Location 101 ALL Component Index Component Location
 Adjustment/Test 501 ALL Adjustment 518 Operational Test 501 Operational Test 503 Operational Test 507 Operational Test 507 Operational Test 509
 SWITCHES - DOOR WARNING 52-71-01
 Removal/Installation 401 ALL
 PASSENGER DOORS AUTO/MANUAL 52-73-00
 POSITION INDICATING SYSTEM

 Description and Operation 1 ALL General 1 Switches 1 Operation 1
 Component Location 101 ALL Component Index Component Location
 52-CONTENTS
 GUN Page 12 Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 CHAPTER 52 - DOORS
 TABLE OF CONTENTS
_________________
 Chapter Section Subject_______ Subject ____ Effectivity
_______ Page ___________
 Adjustment/Test 501 ALL Adjustment 508 Operational Test 501
 SWITCH - MAIN DECK PASSENGER 52-73-01
 DOOR AUTO/MANUAL POSITION
 INDICATING

 Removal/Installation 401 ALL SWITCH - UPPER DECK DOOR MANUAL 52-73-02 POSITION INDICATING Removal/Installation 401 ALL
 52-CONTENTS
 GUN Page 13 Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 DOORS - DESCRIPTION AND OPERATION
_________________________________
 1.  General (Fig. 1)_______
 A.  The doors are removable units enclosing various airplane compartments. Depending on their specific function, the doors permit entry/exit of personnel, removal/installation of equipment and servicing of airplane systems.
 B.  Two main entry doors provide access to the main cargo deck. Both doors are on the left side of the airplane, one at the aft end and one at the forward end of the fuselage. The doors are outward opening, plug-type, hinged doors which are operable from inside or outside the airplane.
 C.  The crew compartment overhead hatch, located in the aft area of the flight compartment on the upper left side of the fuselage, is an inward opening, plug-type hinged door operable from either inside or outside the airplane. Exit from the overhead hatch to ground is provided by descent devices.
 D.  One upper deck crew service door, on the right side, provides access to the upper deck compartment. The door is inward opening, plug-type, track-mounted door which is operable from inside or outside the airplane. Floor-mounted escape slide is installed at the door for emergency evacuation.
 E.  There are five cargo doors on the airplane. The forward, aft and bulk cargo doors located on the lower right side of the fuselage serve the forward, aft, and bulk cargo compartments. The fourth cargo door is the nose cargo door which opens upward to allow straight-in loading onto the main cargo deck. The fifth cargo door is the main deck cargo door located on aft of the wing on the left side of the fuselage to allow cargo to be loaded onto the main deck. The forward, aft and main deck cargo doors are outward-opening, electrically actuated, hinged doors. The bulk cargo door is an inward-opening, plug-type, hinged door. The nose cargo door is electrically actuated and opens upward on two hinges at the upper aft corners of the door. All cargo doors, except the nose cargo door, are operable from either inside or outside the airplane.
　
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