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747-400
MAINTENANCE MANUAL
VACUUM
REGULATOR
VALVE A21010 VACUUM TANK-
PRESSURE RELIEF VALVE TEST
Pressure Relief Valve Test Setup (Boeing) Figure 502
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747-400 MAINTENANCE MANUAL
(b)
Connect the air pressure source to the quick-disconnect air connection on the vacuum tank assembly.
(c)
Make sure the vacuum regulator valve on the vacuum tank assembly is turned fully clockwise.
(d)
Adjust the air control valve until the indication on the pressure gage is 70 |10 psi (482.6 |68.9 kPa).
(e)
Adjust the vacuum regulator valve until the differential pressure is approximately 2.0 psig (13.8 kPa).
NOTE: Turn the vacuum regulator valve counter-clockwise to
____ increase the vacuum (differential pressure). The arrow on the vacuum regulator valve indicates an increase of pressure not vacuum.
(f)
Install the static port adapter to the remote sensor port on the airplane fuselage. 1) Make sure the plunger is in the center hole of the port and
that the adapter is over all of the port.
(g)
Open the remote sensor vavle to the static port adapter.
CAUTION: HOLD THE VACUUM HEAD ASSEMBLY AGAINST TH AIRPLANE FUSELAGE
_______ AS YOU DO THE TEST. THE VACUUM HEAD CAN BE DAMAGED IF IT FALLS TO THE GROUND WHEN THERE IS NO VACUUM.
(h) Put and hold the vacuum head assembly over the applicable relief valve and open the vacuum head assembly valve. 1) Make sure the vacuum head assembly is sealed to the
airplane skin.
S 725-027
(2) Do the remote ambient sensor 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).
(a) Adjust the vacuum regulator valve to increase the differential pressure at the rates that follow: 1) When the differential pressure is 0 to 8.70 psig (0 to
60 kPag), apply the vacuum at a rate not greater than
5.00 psig/min (34.5kPag/min). 2) When the differential pressure is 8.70 to 9.40 psig (60 to
64.8 kPag), apply the vacuum at a rate not greater than
2.00 psig/min (13.8 kPag).
(b) Make sure the pressure relief valve opens at a differential pressure of 9.25 |0.20 psig (63.8 |1 kPag).
NOTE: The pressure that the relief opens is seen on the
____ differential pressure gage when the needle stops, and then starts to decrease.
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MAINTENANCE MANUAL
(c) (d) If the pressure relief valve opens at a differential pressure more than 9.40 psig (64.8 kPag), make sure that there are no leaks at any of the tubing connections on the vacuum tank assembly.Adjust the vacuum regulator valve until the differential pressure is approximately 2.0 psig (13.8 kPag) at a rate not more than 4.0 psig/min (27.6 kPag).
S 725-028
(3) Do the integral ambient sensor 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).
(a) (b) (c) Close the remote sensor valve on the vacuum tank assembly.Adjust the vacuum regulator valve to increase the differential pressure at the rates that follow: 1) When the differential pressure is 0 to 9.00 psig (0 to 62 kPag), apply the vacuum at a rate not more than 5.00 psig/min (34.5 kPag). 2) When the differential pressure is 9.00 to 9.80 psig (62 to 67.6 kPag), apply the vacuum at a rate not more than 2.00 psig/min (13.8 kPag).Make sure the pressure relief valve opens at a differential pressure of 9.65 |0.20 psig (66.5 |1 kPag).
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