(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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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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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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