(2)  
Access Panel
 821R Door - Forward Cargo Compartment
 822R Door - Aft Cargo Compartment

 D.
Procedure

 (1)  
Open the door electrically (Ref 52-34-00/001).

 (2)  
Make sure the actuator arms do not touch the structure (Detail A).

 S 826-024

 (3)  
If the actuator arm touches the structure, adjust the door up switch (Ref 52-34-00/501).

 S 016-002
 S 226-003
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A

747-400
MAINTENANCE MANUAL

ROTARY
ACTUATOR
(2 LOCATIONS)

C C
SEE A B
MIDSPAN 
LATCH CAM 
A 
A 
B  HOOK 
MECHANISM 
(2 PLACES) 

Cargo Door Inspection/Check
Figure 601 (Sheet 1)

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747-400
MAINTENANCE MANUAL

NOT TOUCH THE LATCH CAM
Cargo Door Inspection/Check Figure 601 (Sheet 2)
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747-400
MAINTENANCE MANUAL

SEE B
B-B
90`
90`
MASTER LATCH LOCK HANDLE
SPRING SCALE 45 POUNDS MAXIMUM
C
CARGO DOOR SHOWN NOT FULLY OPEN
SEE C GAP BETWEENHOOK AND EXTERNAL STOP BOLT
EXTERNAL STOP BOLT
APPROXIMATLY 3 INCHES GAP BETWEEN
HOOK PIN AND HOOK HOOK PIN ON BODY
HOOK (2 LOCATIONS)
CARGO DOOR
B

CARGO DOOR 
CLOSED AND 
LATCHED 
POINT B  CARGO 
DOOR 
8.0 +0.6/-0.3 
INCH 
PRESSURE RELIEF  PRESSURE 
POINT A  DOOR (OPEN)  RELIEF 
DOOR 
(CLOSED) 
0.50 INCH 
BELLCRANK 
CARGO 
DOOR 
PRESSURE RELIEF DOOR 
C-C 
Cargo Door Inspection/Check 
Figure 601 (Sheet 3) 

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747-400
MAINTENANCE MANUAL

MASTER LATCH LOCK MECHANISM
SEEA
PRESSURE RELIEF DOOR
PRESSURE RELIEF DOOR TORQUE TUBE
MASTER LATCH
LOCK HANDLE

MASTER LATCH  MASTER LATCH
LATCH CAM
LOCK SECTORS  LOCK TORQUE TUBE
(8 LOCATIONS)
(8 LOCATIONS) FWD SEE B MASTER LATCH LOCK MECHANISM
A
Master Latch Lock System Inspection/Check
Figure 602 (Sheet 1)
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A 747-400 MAINTENANCE MANUAL
BEARING HOUSING-MASTER LATCH LOCK SECTOR TORQUE TUBE

MASTER LATCH LOCK SECTOR
(8 LOCATIONS)

B

Master Latch Lock System Inspection/Check
Figure 602 (Sheet 2)

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