(2)
The removal of a pressure relief door.
(3)
Do a Check of the Pressure Relief Door Mechanism
B.
The forward and aft cargo doors have two pressure relief doors in the top half. You can remove and install the pressure relief doors with the cargo door installed.
C.
The task to do a check of the pressure relief door mechanism is included in the tasks to remove and install the pressure relief door. Thus is you do the task to remove the pressure relief door and the task to install the pressure relief door, then it is not necessary to do the task to do a check of the pressure relief door mechanism.
TASK 52-34-04-004-001
2. Remove the Pressure Relief Door (Fig. 401)_______________________________
A. References
(1)
AMM 52-34-00/001, Forward/Aft Cargo Door
(2)
AMM 52-34-05/401, Junction Box
(3)
AIPC 52-34-04 Fig. 1
B.
Access
(1)
Location Zone 122 Forward Cargo Container Compartment, Forward Half 142 Aft Cargo Container Compartment
(2)
Access Panel
821R Door - Forward Cargo Compartment
822R Door - Aft Cargo Compartment
C.
Procedure
S 864-030
(1)
Open the cargo door to get access to the pressure relief door (AMM 52-34-00/001).
(2)
Remove the junction box from the cargo door (AMM 52-34-05/401).
S 014-004
(3)
Remove the shrouds that are on the cargo door near the pressure relief doors.
S 034-003
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52-34-04
ALL ú ú 01 Page 401 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
PRESSURE RELIEF DOOR
SEE A
STOP PIN
(2 LOCATIONS)
PRESSURE
RELIEF DOOR
STRIKER ARM FOR THE DOOR WARNING SWITCH
1
THE STRIKER ARM FOR THE DOOR WARNING SWITCH IS ONLY ON THE FORWARD PRESSURE RELIEF DOOR
1
A
747-400
MAINTENANCE MANUAL
LATCH ACTUATOR
BELL CRANK
CONTROL ROD
PRESSURE RELIEF DOOR
A
Pressure Relief Door Figure 401 (Sheet 1)
SHROUD (2 LOCATIONS)
A
HINGE FITTING
A
FWD
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
52-34-04
ALL ú ú 01 Page 402 ú Jun 10/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
A-A
Pressure Relief Door
Figure 401 (Sheet 2)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
52-34-04
ALL ú ú 01 Page 403 ú Jun 10/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 014-005
(4)
Remove the lining from the top half of the door.
S 864-031
(5)
Manually turn the latch actuator clockwise until the latches are closed (AMM 52-34-00/001).
S 864-032
(6)
Close the master latch lock handle.
S 034-008
(7)
Disconnect the control rod from the bellcrank (Detail A).
S 024-009
(8)
Remove the eight bolts that hold the hinge fittings to the door rib.
NOTE: There is a hole through the internal surface of the door
____ below the pressure relief door. Get access to the outboard bolts through this hole.
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