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 B.  The door is normally operated by an integrated manual and electrical system. A manually operated external master latch lock handle locks or unlocks the lower door latches, opens or closes the pressure relief doors, and energizes or de-energizes the electrical system control switch. The control switch operates a 3-phase actuation system. The 3-phase actuation system consists of the latch actuator, hook actuator, and lift actuator operating in sequence. An auxiliary manual drive permits door operation without electrical power.
 C.  The forward and aft cargo doors operate correctly in wind that is less than 40 knots. They can stay in the fully open position in gusts that are less than 65 knots.
 D.  Shrouds are installed on the pressure relief doors.
 2.  Cargo Door Mechanism
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400 MAINTENANCE MANUAL
JUNCTION BOX
LIFT MECHANISM
SEE E DOOR UPDOOR SWITCHATTACHMENT
SEE F
SHROUD (2 LOCATIONS)
MID SPAN LATCH OPEN SWITCH (AFT)
LATCH OPEN SWITCH 1 HOOKDOOR MECHANISM
WARNING SWITCH SEE D
HOOK CLOSE 
SWITCH 
LATCH OPEN MID SPAN  MASTER LATCH LOCK SWITCH 
SWITCH (FORWARD)  DOOR CLOSE 
SWITCH 
DOOR 
RESTRAINT  DOOR LATCHED SWITCH 
SOLENOID 
LATCH MECHANISM 
MASTER LATCH 
LOCK MECHANISM  SEE  C 
SEE  B  LATCH CAM (8 LOCATIONS) 
LATCH CAM ALIGNMENT 
EXTERNAL  STRIPE VIEWING PORT 
CONTROL SWITCH  LATCH  (8 LOCATIONS) 
SEE  A  SWITCH CLOSE  SEE  G 
HOOK 
POSITION 
SWITCH 
FWD 

FWD
EXTERNAL CONTROL SWITCH
A
1
AIRPLANES WITH LATCH OPEN SWITCH
Forward Cargo Door
Figure 1 (Sheet 1)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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

PRESSURE RELIEF DOOR (2 PLACES)
PUSHROD (2 PLACES)
CRANK (2 PLACES)
INTERMEDIATE
RELEASE TORQUE TUBE
TRIGGER
MASTER LATCH LOCK HANDLE
PUSHROD
PUSHROD
BELLCRANK
LOCK SECTORS 
(8 PLACES) 
MIDSPAN  MID SPAN LATCH 
LATCH CAM  TORQUE TUBE 
(2 PLACES)  (2 PLACES) 

PUSHROD (2 PLACES)
BELLCRANK (2 PLACES)
PUSHROD (2 PLACES)
PUSHROD (4 PLACES)
FWD
747-400
MAINTENANCE MANUAL

PRESSURE RELIEF DOOR TORQUE TUBE
MASTER LATCH LOCK MECHANISM B MASTER LATCH LOCK TORQUE TUBE LATCH BELLCRANK (TYP)  FWD PUSHROD PUSHROD BELLCRANK BELLCRANK 
LATCH ACTUATOR  LATCH TORQUE TUBE 

LATCH MECHANISM LOWER LATCH CAM (8 PLACES)  LATCH BELLCRANK (4 PLACES) 
C 
Forward Cargo Door Figure 1 (Sheet 2) 

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

HOOK
DOOR
TORQUE
RESTRAINT
TUBE
PUSHROD (2 PLACES)
FWD
EXTERIOR MANUAL DRIVE
UPPER SILL
DOOR ATTACH POINT
HOOK RETURN 
HOOK  SPRING (2 PLACES) 
ACTUATOR 

HOOK 
BELLCRANK 
(2 PLACES) 
HOOK MECHANISM 
D 

A
DOOR UP SWITCH ROTARY ACTUATOR (2 PLACES)
A
INTERIOR MANUAL DRIVE
LIFT ACTUATOR
DRIVE TORQUE TUBE
(2 PLACES)
FWD

LIFT MECHANISM
E

Forward Cargo Door Figure 1 (Sheet 3)
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