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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 PRESSURE RELIEF VALVE - ADJUSTMENT/TEST
_______________________________________
 1.  General_______
 A.  This procedure has instructions to do a test of the positive pressure relief valves. The remote ambient test does a check of the normal pressure relief system. The integral ambient test does a check of the back-up pressure relief system.
 B.  There are two different test fixtures which can be used for this test. Do the procedure that uses the test fixture that you have.
 TASK 21-32-01-705-001
 2.  Pressure Relief Valve Test with Hamilton Standard Valve Test Equipment______________________________________________________________________ GS13963-1 (Fig. 501)_________
 A.  General
_______
 (1)  This test is a calibration check of the positive pressure relief valves.
 B.  Special Tools and Equipment
 (1)  GS13963-1, Valve Test Fixture Hamilton Standard, Windsor Locks, Connecticut
 C.  Standard Tools and Equipment
 (1)  
Vacuum Source - 0-20 inches mercury (absolute)

 (2)  
Vacuum Gage - 0-10 psi with accuracy of | 0.15 psi

 D.  Consumable Materials
 (1)  D00250 Lubricant - VV-P-236
 E.  References
 (1)  
21-00-00/201, Air Conditioning

 (2)  
AIPC 21-32-00, Fig. 1

 (3)  
WDM 21-33-11

 (4)  
SSM 21-33-01

 F.  Access
 (1)  Location Zone 123 Forward Cargo Container Compartment Aft Half, LH
 G.  Prepare for the Test
 S 865-024
 (1)  Make sure these circuit breakers are closed:
 (a)  P6 Main Power Distribution Panel:
 1) 6F35, PACK TEMP CONT-A

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 21-32-01
 ALL  ú ú 02 Page 501 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

REMOTE AMBIENT TEST SETUP
A
GATE

INTEGRAL AMBIENT TEST SETUP
B
Pressure Relief Valve Test Setup (Hamilton Standard)Figure 501
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 21-32-01
 ALL  ú ú 01 Page 502 ú Jun 10/88
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 2) 6F36, PACK TEMP CONT-B
 3) 6J33, MISC ECS PCA

 H.  Remote Ambient Test
 NOTE: If the valve does not open at the pressure specified for the
____ Remote Ambient Test, remove the valve (AMM 21-32-01/401) and calibrate (CMM 21-32-01).
 S 485-003
 (1)  Install the test equipment as shown in Figure 501, detail A.
 (a)  Attach the remote port adapter to the skin so that the center cup is on the remote sensing port.
 NOTE: The remote ambient port is the perforated opening in the
____
 airplane skin.

 (b)  
Apply lubricant to the O-ring on the probe end of the discharge port adapter.

 (c)  
Open the valve door and install the probe of the discharge port adapter into the discharge port.

 (d)  
Connect the remote port adapter to the discharge port adapter with the 10 foot (3 meter) hose assembly.

 (e)  
Connect a regulated vacuum source to the discharge port adapter.

 S 725-004
 (2)  Do the Test:
 (a)  Slowly decrease the system pressure at a rate of not more than
 0.75 in. Hg/min until the valve opens.
 (b)  
Make sure the valve opens at a differential pressure of 9.25 (+0.15/-0.15) psi (63.8 |1 kPa).

 (c)  
If the valve opens at more than 9.35 psi (64.5 kPa), make sure there are no loose fittings on the remote ambient sense tubing or the test equipment tubing.

 (d)  
With the valve open, do the steps that follow:

 1)  Make sure the applicable status message UPR PRESS RELIEF or LWR PRESS RELIEF is shown on the lower EICAS screen after 5 seconds.
　
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