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 NOTE:____ The pressure that the relief valve opens is seen on the differential pressure gage when the needle stops and the pressure starts to increase.
 (d)  If the relief valve opened at a differential pressure more than 9.80 psig (67.6 kPag), then make sure there are no leaks at any of the tubing connections on the vacuum tank assembly.
 S 865-029
 (4)  Adjust the vacuum regulator valve until the differential pressure is approximately 2.0 psi (13.8 kPa) at a rate not more than 4.0 psig/min (27.6 kPag/min).
 S 485-030
 (5)  Close the vacuum head assembly valve and the remove the vacuum head assembly from the airplane fuselage.
 S 865-031
 (6)  Adjust the vacuum regulator valve fully clockwise and decrease the differential pressure to zero psi (zero kPa).
 S 725-032
 (7)  Do the remote ambient sensor test and the integral ambient sensor test for the other positive pressure relief valve.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 21-32-01
 ALL  ú ú 03 Page 508 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 S 085-033
 (8)  
Remove the test equipment from the airplane.

 S 865-034

 (9)  
Close the valve door on the pressure relief valves.

 H. Do the EICAS Message Test for the Pressure Relief Valves
 NOTE: Do the test for the upper pressure relief valve first, then do the
____
 test for the lower pressure relief valve.

 S 015-035
 (1)  Remove the cargo lining on the left sidewall in the forward cargo compartment at STA 770 to get access to the pressure relief valves (Ref 25-52-01/401).
 S 865-036
 CAUTION: MAKE SURE YOU PULL THE VALVE GATE STRAIGHT AND ONLY THE MINIMUM
_______ DISTANCE THAT IS NECCESARY TO CAUSE THE INDICATION. YOU CAN CAUSE DAMAGE TO THE VALVE IF YOU PULL THE VALVE GATE OPEN TOO FAR OR IF THE VALVE GATE IS NOT ALIGNED WITH THE VALVE.
 (2) Use two hands to carefully pull the valve gate open approximately
 0.50 inch (12.7 mm).
 S 865-037
 (3)  
Make sure the applicable EICAS status message UPR PRESS RELIEF or LWR PRESS RELIEF shows on the lower EICAS screen.

 S 865-038

 (4)  
Let the valve gate move to the closed position.

 S 865-039

 (5)  
Make sure that the applicable EICAS status message UPR PRESS RELIEF or LWR PRESS RELIEF does not show on the lower EICAS screen after 5 seconds.

 (6)  
Do the EICAS message test again for the other pressure relief valve.

 S 415-041

 (7)  
Install the cargo lining which you removed to get access to the pressure relief valves (Ref 25-52-01/401).

 S 725-040
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 21-32-01
 ALL  ú ú 04 Page 509 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 PRESSURE RELIEF VALVE FILTER - REMOVAL/INSTALLATION
___________________________________________________
 1.  General
_______
 A.  There are two tasks in this procedure, one for removal and one for installation of the pressure relief valve filters. The pressure relief valves are installed in the forward cargo compartment.
 B.  The steps that are necessary for removal and installation of a pressure relief valve filter are as follows:
 (1)  
Remove the sidewall lining from the forward cargo compartment

 (2)  
Remove the filter cover and filter from the pressure relief valve

 (3)  
Clean and examine the filter housing

 (4)  
Install the filter and filter cover.

 C.  The sidewall lining in the forward cargo compartment must be removed to get access to the pressure relief valves.
 TASK 21-32-02-004-001
 2.  Remove the Pressure Relief Valve Filter (Fig. 401)
_______________________________________
 A.  References
 (1)  
25-52-01/401, Containerized Cargo Compartment Ceiling and Sidewall Linings
　
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