C.
Remove the Pressure Relief Door (Fig. 401).

 S 864-017
 WARNING:_______ MAKE SURE THAT PERSONS AND EQUIPMENT ARE AWAY FROM THE DOOR AND
 THE DOOR OPENING WHEN YOU OPERATE THE DOOR.  FAILURE OF THE
 LIFT MECHANISM COULD CAUSE THE DOOR TO CLOSE QUICKLY WHICH

 COULD CAUSE INJURY OR DAMAGE.
 (1)  
Close and lock the cargo door.

 S 014-004

 (2)  
Remove the fiberglass shroud.

 S 014-005

 (3)  
Remove the drip sheilds of the pressure relief doors from the cargo door.

 S 034-006

 (4)  
Disconnect the control rod and the spring ends from the crank (View A).

 S 034-007

 (5)  
Remove the bolts that secure the hinge fittings to the door frame.

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 52-32-07
 ALL  ú ú 03 Page 401 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

PRESSURE RELIEF DOOR
SEE A
STOP PIN
PRESSURE 
RELIEF 
DOOR SEAL 
(2 LOCATIONS) SHROUD  PRESSURE RELIEF 
PRESSURE RELIEF  DOOR 
DOOR DRIP SHIELD 
(2 LOCATIONS) 
CRANK 
TORQUE TUBE 
PUSHROD  DOOR 
SKIN 
SIDE CARGO DOOR 
SHROUD  OUTBD 
(2 LOCATIONS) 
HINGE 
FITTING  SPRING 
FWD  A-A  CONTROL 
ROD 
A 

BUSHING (2 INSTALLED)STOP PIN FITTING (2 LOCATIONS)
PRESSURE SPRING
RELIEF DOOR ENDS
DOOR
BUSHING (1 INSTALLED)
DOOR WARNING SWITCH STRIKER HINGE FITTING
1 CONTROL
SPRING ROD PRESSURE RELIEF CRANK
DOOR SHAFT
A PRESSURE RELIEF DOOR
A
THE STRIKER FOR THE DOOR WARNING SWITCH IS ONLY ON THE AFT PRESSURE RELIEF DOOR Pressure Relief Door Figure 401
1
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 52-32-07
 ALL  ú ú 02 Page 402 ú Feb 10/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 024-018
 (6)  
Remove the pressure relief door, the hinge fittings, the springs and the shaft as a unit.

 S 714-008

 (7)
Examine the seal around the cuttout of the pressure relief door.

 S 964-019

 (8)  
Replace the seal if it is damaged.

 TASK 52-32-07-404-009
 3.  Install the Pressure Relief Door________________________________
 A. Standard Tools and Equipment
 (1)  
Spring Scale - 0-25 pounds

 B.
References

 (1)  
AMM 52-09-00/801, Door Seal

 (2)  
AIPC 52-32-07 Fig. 1

 C.
Access

 (1)  
Location Zone
 261 Main Deck STA 1720 To STA 2040, LH

 (2)  
Access Panels
 836L Door - Main Deck Cargo

 D.
Install the Pressure Relief Door (Fig. 401).

 S 364-010
 (1)  Examine the seal on the pressure relief door for damage or deterioration.
 NOTE: If damage is found, repair the seal per AMM 52-09-00/801.
____
 S 424-011
 (2)  
Put the pressure relief door, the hinge fittings, the springs and the shaft as a unit in position on cargo door frame.

 S 434-020

 (3)  
Install the hinge fittings with the outboard attachment boltheads in the down posiiton.

 (4)  
Align the holes in the control rod and pressure relief door crank.

 (5)
Put the spring ends into position to touch the attachment bolt.

 (6)  
Install the bolt as shown (View A).

 S 434-012
 S 864-021
 S 434-022
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