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 E.  All components of the master latch lock, latch and hook mechanisms are installed on the door, as are all sequence switches except the door up and down switches.
 3.  Master Latch Lock Mechanism (Fig. 2)
___________________________
 A.  The master latch lock mechanism is manually operated to lock and unlock the door and open two pressure relief doors. The pressure relief doors remain open when the master latch lock handle is open to prevent pressurization of the airplane. The pressure relief doors also open to limit pressure difference to a permitted level if the external pressure becomes higher than the pressure inside the airplane.
 B.  A fiberglass laminate shroud is installed over each pressure relief door to prevent inadvertent closing of the doors during airplane pressurization. An acrylic window is installed in the bottom of the shroud to provide improved visual monitoring of pressure relief door operation.
 C.  Ten lock sectors are installed on a common torque tube along the bottom edge of the door and align with the ten latch cams. The lock sectors extend to interfere with the latch cams to prevent their becoming unlatched when the door is closed, and retract to clear the cams when the door is to be opened. The two pressure relief doors are connected by linkages to a common torque tube approximately midway up the door.
 D.  The pressure relief door and lock sector torque tubes are connected by linkages to operate together when the master latch lock handle is operated. The pressure relief doors open as the lock sectors retract and close as the lock sectors extend.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

GEARBOX AND BRAKE ASSEMBLY (2 LOCATIONS)
LIFT POWER UNIT
DOOR UP SWITCH 
MANUAL DRIVE  (2 LOCATIONS)  DOOR DOWN 
FLEXIBLE SHAFT  SWITCH 
(2 LOCATIONS) 
ROTARY 
MIDSPAN LATCH TORQUE TUBE  (2 LOCATIONS) ACTUATOR ARM 
(2 LOCATIONS)  ROTARY 
DOOR WARNING  ACTUATOR LINK 
SWITCH  (2 LOCATIONS) 
(2 LOCATIONS) MIDSPAN LATCH  PRESSURE RELIEF DOOR 

PRESSURE RELIEF MANUAL DRIVE DOOR TORQUE TUBE GEARBOX
MIDSPAN LATCH SIDE CARGO DOOR HOOK ACTUATOROPEN SWITCH EQUIPMENT MODULE (2 LOCATIONS)(2 LOCATIONS) (SEQUENCING RELAYS)
MASTER LATCH LOCK HANDLE LATCH ACTUATOR
LATCHES OPENHOOK RESTRAINT SWITCHSOLENOID (2 LOCATIONS) LATCH MECHANISM
SEE B
HOOK RESTRAINT ARM (2 LOCATIONS) LATCH CAM SHAFT
HOOK MECHANISM
(5 LOCATIONS) SEE C
MASTER LATCH LOCK SWITCHHOOK (2 LOCATIONS) LATCH
DOOR CLOSED SWITCHHOOK CLOSED SWITCH
CLOSED (2 LOCATIONS) DOOR SWITCH EXTERNAL LATCH LATCHED STOP FITTING HOOK OPEN SWITCH LATCH LOCK SWITCH
EXTERNAL LATCH
(2 LOCATIONS) SECTOR STOP FITTING
(10 LOCATIONS)
LATCH CAM MASTER LATCH (10 LOCATIONS) LOCK MECHANISM
SEE A
INTERIOR VIEW
Side Cargo Door Mechanisms Figure 2 (Sheet 1)
D13407
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
PRESSURE RELIEF PRESSURE RELIEF

LATCH (10 PLACES)
ACTUATOR  SHAFT (5 PLACES)
LATCH MECHANISM

B

Side Cargo Door Mechanisms Figure 2 (Sheet 2)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

HOOK (2 PLACES)
HOOK MECHANISM

Side Cargo Door Mechanisms
Figure 2 (Sheet 3)

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