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A
747-400 MAINTENANCE MANUAL
 PRESSURE RELIEF DOOR - INSPECTION/CHECK
_______________________________________
 1.  General_______
 A.  This procedure consists of illustrations and wear limit charts for the pressure relief door which is found on the lower lobe cargo door.
 B.  Wear on the inner surface of the shroud or penetrations through the shroud may occur if the pressure relief door stop fittings or stop bolts contact the shroud. Penetrations through the shroud must not exceed an area greater than 0.78 square inch (at each door stop location). This wear is acceptable. The wear will not affect the pressure relief door operation or function of the shroud.
 TASK 52-34-04-206-001
 2.  Pressure Relief Door Wear Limits________________________________
 A.  References
 (1)  
52-34-04/401, Pressure Relief Door

 (2)  
IPC 52-34-04 Fig. 1

 B.  
Access

 (1)  
Location Zone 122 Forward Cargo Container Compartment, Forward Half 142 Aft Cargo Door Container Compartment

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

 C.  
Procedure

 S 026-002
 (1)  
Remove the pressure relief door from the cargo door (Ref 52-34-04/401).

 S 226-003

 (2)  
Do a check of the wear on the pressure relief door shaft and bushings (Fig. 601):

 (a)  
Measure the parts as necessary and compare the measured dimensions to the limit dimensions.

 (b)  
If the part is not in the permitted tolerance, replace or repair the part as necessary.

 S 426-004
 (3)  Install the pressure relief door on the cargo door
 (Ref 52-34-04/401).

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 52-34-04
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747-400
MAINTENANCE MANUAL

FORWARD CARGO DOOR
ASEE RELIEF DOOR PRESSURE 
MANUAL HANDLE 
ACTUATOR LATCH 

Pressure Relief Door Wear Limits
Figure 601 (Sheet 1)

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 52-34-04
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400
MAINTENANCE MANUAL

A-A

Pressure Relief Door Wear Limits
Figure 601 (Sheet 2)

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 52-34-04
 ALL  ú ú 01 Page 603 ú Oct 10/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400
MAINTENANCE MANUAL

NO. INDEX  PART NAME  DIM.  DESIGN LIMITS  WEAR LIMITS  PART WORN REPLACE  PART WORN REPAIR  INSTR REPAIR 
DIAMETER  PER-MITTED WEAR DIM.  ANCE CLEAR-MAX DIA 
MIN  MAX 
1  BUSHING  ID  0.8768  0.8776  1  X 
SHAFT  OD  0.8733  0.8743  0.871  X 
2  BUSHING  ID  0.8780  0.8790  1  X 
SHAFT  OD  0.8733  0.8743  0.8743  X 

1 TEFLON LINED BUSHING. REPLACE IT WHEN THE TEFLON LAYER IS NOT SATISFACTORY.
Pressure Relief Door Wear Limits
Figure 601 (Sheet 3)

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 52-34-04
 ALL  ú ú 01 Page 604 ú Oct 10/90
　
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