52-31-00
ALL ú ú 02 Page 612 ú Feb 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
NOSE CARGO DOOR - REMOVAL/INSTALLATION
______________________________________
1. General_______
A. This procedure has two tasks:
(1)
The removal of the nose cargo door
(2)
The installation of the nose cargo door
TASK 52-31-01-024-001
2. Nose Cargo Door Removal (Fig. 401)_______________________
A. Special Tools and Equipment
(1)
Crane (Overhead) - 4500-pound minimum lift capacity
(2)
MIT65B12349 - Thread Protector, Hinge Bolt
(3)
MIT65B80430 - Alternate Drive Extension, Nose Cargo Door Lift Actuator
(4)
PRE65B13015 - Safety Barrier, Nose Cargo Door
(5)
20HME65B13015 - Sling, Nose Cargo Door
B.
Standard Tools and Equipment
(1)
Adapter - 0.250-Inch Hex to 0.375-Inch Square Tang, Model CP-S-75350Y, Chicago Pneumatic Company, or Equivalent
C.
References
(1)
52-31-02/401, Nose Cargo Door Linear Actuator
D.
Access
(1)
Location Zones
801 Nose Cargo Door
(2)
Access Panels
221BR Door Hinge Access, Right
221BL Door Hinge Access, Left
E.
Prepare For Removal (Fig. 401)
S 494-003
(1)
Attach lift brackets to the nose cargo door.
(a)
Remove 44 countersunk screws and plugs from sling attachment points.
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52-31-01
ALL ú ú 02 Page 401 ú Oct 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
LINEAR ACTUATOR (2 LOCATIONS) A DOOR HINGE NOSE CARGO
SEE B
A CLEARANCE DOOR HINGE ACCESS
NOSE CARGO DOOR
EXTENSION ALTERNATE DRIVE (MIT65B80430)
DRIVE UNIT AND MECHANISM FLEX DRIVE SEE A
PUSH-PULL CAM AND ACTUATOR
SEE C
COMMERCIAL
MIT65B80430 ADAPTER
AIR OR ELECTRIC
ALTERNATE DRIVE EXTENSION
A
Nose Cargo Door Installation
Figure 401 (Sheet 1)
B26876
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52-31-01
ALL ú ú 02 Page 402 ú Feb 10/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
WASHER LUBE FITTING BOLT
DOOR HINGE
THREAD PROTECTOR HALF
MIT65B12349
NUT BODY HINGE HALF
POINT OF WASHER PUSH-PULL CAM CONTACT ACTUATOR
ROLLER SHIM (2 LOCATIONS) (2 LOCATIONS)
HINGE BOLT INSTALLATION (DOOR IN FULL OPEN POSITION)
B
CAM FWD
NOSE CARGO
DOOR
LARGE NUT (TIGHTEN TO HINGE HALF DOOR HINGE PUSH-PULL CAM AND ACTUATOR
2000 TO 2400 POUND-INCHES) BUSHING 0.08 0.13 0.03 (SHOWN IN THE OPEN POSITION)
SMALL C
NUT
SMALL
HINGE
BOLT
SHIM
(2 LOCATIONS)
COTTER LARGE HINGE
PIN
BOLT
WASHER
WASHER HINGE
WASHERS BODY HINGEINBD BEARING
0.13 HALF0.08
0.03 FWD
LEFT HINGE SHOWN
(RIGHT HINGE EQUIVALENT)
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