L15408
Pressure Relief Valve Test 500
38-41-51Page 502 Figure 501 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. May 01/00
(1) Initial pressure noted should be between 47 and 63 psig.
G. If initial pressure noted is less than 47 psig, or greater than 63 psig, replace pressure relief valve.
H. Check reset pressure of pressure relief valve.
(1)
With pressure at relief pressure, gradually close the pressure regulator.
(2)
Visually monitor pressure gage as pressure decreases.
(3)
Record the reset pressure at which the airflow stops or the decrease of pressure stops.
(a) Reset pressure recorded should be greater than 37 psig.
(4)
If reset pressure is less than 37 psig, replace pressure relief valve.
(5)
Reduce pressure to zero psig.
I. Perform a subsequent test by performing steps 3.C. through 3.G.
(1) If pressure is less than 47 psig, or greater than 53 psig, replace pressure relief valve.
J. Reduce pressure to zero psig.
WARNING: DO NOT TURN THE DEFLECTOR CAP WHEN YOU REMOVE OR INSTALL THE PRESSURE RELIEF VALVE. THE PRESSURE AT WHICH THE RELIEF VALVE RELEASES PRESSURE CAN CHANGE IF THE DEFLECTOR CAP TURNS. IF THE PRESSURE RELIEF VALVE DOES NOT RELEASE AT THE CORRECT PRESSURE, INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR.
K. Install pressure relief valve on airplane (AMM 38-41-51/401).
500
May 01/00 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 38-41-51 Page 503
WATER TANK PRESSURE REGULATOR - REMOVAL/INSTALLATION
1. Remove Water Tank Pressure Regulator (Fig. 401)
A. Depressure water tank and pneumatic system, (AMM 38-41-0/201).
B. Open aft cargo door.
C. Remove the aft cargo compartment rear bulkhead panel.
D. Remove air line cross from pressure regulator union, discard O-ring.
E. Install cap on air line cross to keep contamination out.
F. Disconnect union between filter and pressure regulator on the pressure regulator side, discard O-ring.
NOTE: It may be necessary to remove air filter to aid in removing pressure regulator.
G. Install cap on union to keep contamination out.
H. While holding pressure regulator, remove two mounting bolts, remove pressure regulator.
2. Install Water Tank Pressure Regulator (Fig. 401)
A. While holding pressure regulator in place, install two mounting bolts.
B. Remove cap from air filter and pressure regulator union.
C. If removed, install air filter (AMM 38-41-11/401).
D. Install pressure regulator with new O-ring on union.
E. Remove cap from union on air line cross.
F. Install air line cross with new O-ring to pressure regulator.
G. Pressurize water tank (AMM 38-41-0/201).
H. Inspect pressure regulator and its connections for air leaks.
I. Restore airplane to normal.
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L15378
Pressure Regulator Installation 500
38-41-52 Figure 401 Nov 15/67
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
WATER TANK PRESSURE REGULATOR - ADJUSTMENT/TEST
1. General
A. The purpose of this test is to verify that the water tank pressure regulator reduces engine bleed air within correct range.
2. Equipment and Materials
A. Two pressure gages (0-80 psig ±0.5 psig)
B. Control valve (pressure rating 150 psig minimum, 3/8 inch minimum globe type, 15 scfm minimum flow at 50 psid)
C. Pressure regulator (pressure rated for air source, outlet pressure adjustable, zero to 100 psig, 3/8 inch minimum)
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