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 2.  Nose Cargo Door (Fig. 1)_______________
 A.  The nose cargo door is suspended by two hinges beneath the corners of the windshields and open upward approximately 73 degrees. The door provides a clear opening of 98 by 104 inches to load/unload cargo pallets or containers.
 B.  The door operating system consists of a push-pull cam and actuator, latch system, lift system, pressure and aerodynamic seals and an adjustable skin fairing at the aft edge of the door.
 (1)  
The lift system has a drive unit, two flexible drive shafts and two exchangeable linear actuators. The drive unit drives the two linear actuators in synchronization.

 (2)  
The latch system has 21 latches installed around the circumference of the door frame. They are numbered from the bottom, 1 through 10 left and right, and a single latch 11 on center top. Sixteen latches, 1 through 8 left and right, have retractable pins operated by electrical actuators. Latches 9, 10 and 11 have fixed pins.

 C.  
The latch annunciation panel is installed below the nose door and light control panel. This panel shows the latched/not latched conditions of each of the 16 latches.

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A

747-400
MAINTENANCE MANUAL

LATCH ACTUATOR TEST PANEL
SEE F
NOSE DOOR
CONTROL EQUIPMENT
MODULE, H122

LATCH ACTUATOR  DOOR HINGE
SEE E
HINGE ACCESS DOOR
PRESSURE SWITCH
AND ISOLATION RELAY
LINEAR ACTUATOR NOSE DOOR
SEE B
AND LIGHT DRIVE UNIT
MODULE, H121
SEEA  SEEG
ADJUSTABLE DOOR LATCH
FAIRING
ANNUNCIATOR SEE D
SEE H
DOOR CLOSED PUSH-PULL CAM
ANNUNCIATOR AND ACTUATOR
SEE I SEE C
NOSE CARGO DOOR
Nose Cargo Door System - Component Location
Figure 1 (Sheet 1)

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B26790
A
747-400 MAINTENANCE MANUAL
DRIVE UNIT
MOTOR

FLEXIBLE
DRIVE SHAFT

DRIVE SHAFT
CONNECTION
DRIVE UNIT

DRIVE UNIT
CONNECTION FOR
A
MANUAL DRIVE DRIVE SHAFT DISCONNECT
FLEXIBLE DRIVE UNIT LINEAR
DRIVE SHAFT  FWD
LINEAR ACTUATOR
ACTUATOR
B
CAM ROLLER (2 LOCATIONS) PUSH-PULL CAM
PUSH-PULL CAM
ACTUATOR MOTOR

CAM ROLLER INPUT SUPPORT MANUAL DRIVE CAM SUPPORT
NOSE CARGO
DOOR

PUSH-PULL CAM ACTUATOR
PUSH-PULL CAM
C
Nose Cargo Door System - Component Location Figure 1 (Sheet 2)
B26798
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A
747-400
MAINTENANCE MANUAL

LATCH ACTUATOR
E Nose Cargo Door System - Component Location Figure 1 (Sheet 3)
B26799
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

LATCH ACTUATOR TEST PANEL, H482
F

NOSE DOOR CONTROL AND 
LIGHTS MODULE, H121  DOOR LATCH ANNUNCIATOR, H449 
. GREEN - LATCHED 
G  . AMBER - NOT LATCHED 
H 

DOOR CLOSED ANNUNCIATOR, H548
I

Nose Cargo Door System - Component Location
Figure 1 (Sheet 4)
　
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