NOTE: The pressure that the relief valve opens is seen on
____ the differential pressure gauge when the needle stops and the pressure starts to decrease. The indicator flag for the safety relief valve may not deploy if the volume of air that passes through the valve is too small.
(d) If the relief valve opened at a differential pressure more than
9.57 psig, then make sure there are no leaks at any of the tubing connections on the vacuum tank assembly.
S 862-036
(4)
Adjust the vacuum regulator valve until the differential pressure is approximately 2.0 psi at a rate not more than 4.0 psig/min.
S 482-026
(5)
Close the vacuum head assembly valve and remove the vacuum head assembly.
S 862-034
(6)
Adjust the vacuum regulator valve fully clockwise and reduce the differential pressure to zero psi.
S 732-027
(7)
Do the Remote Sensor Test and the Integral Sensor Test for the other positive pressure relief valve.
D.
Put the airplane back to its usual condition.
(1)
Remove the test equipment from the airplane.
(2)
Close the flapper door on the relief valves.
S 082-024
S 862-025
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A
757 MAINTENANCE MANUAL
VACUUM RELIEF VALVE - MAINTENANCE PRACTICES
___________________________________________
1. General_______
A. Two vacuum pressure relief valves are installed in the airplane skin on the right side of the main equipment bay. This procedure has instructions to remove, install, and test the vacuum pressure relief valves.
TASK 21-32-02-002-001
2. Remove the Relief Valve (Fig. 201)_______________________
A. References
(1)
AMM 06-41-00/201, Fuselage Access Doors and Panels
B.
Access
(1)
Location Zones
120 Main equipment center (Right)
C.
Prepare for the Removal
S 012-002
(1)
Open the access door, 119BL, for the main equipment center (AMM 06-41-00/201).
S 012-003
(2)
Remove the applicable sidewall panel on the right side of the main equipment center.
D.
Remove the Valve.
S 032-004
CAUTION: WHEN YOU REMOVE THE SPRING OR A PART THAT LETS THE SPRING
_______ UNWIND, HOLD THE SPRING TIGHTLY SO IT DOES NOT SNAP OUT OF ITS POSITION. IF THE SPRING SNAPS OUT OF POSITION, IT COULD CAUSE INJURY TO PERSONS.
(1)
Remove the two hinge bolts as follows:
(a)
Remove the cotter pins from the nuts.
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A
757
MAINTENANCE MANUAL
VACUUM PRESSURE RELIEF VALVES
SEE A
HINGE BOLT
FWD
VALVE DOOR
SPRING PAN ASSEMBLY SPRING SUPPORT ROD
SPRING SUPPORT RETAINER
HINGE BOLT
RETAINING BOLT
VACUUM PRESSURE RELIEF VALVE
A
Vacuum Relief Valve Installation Figure 201
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A
757 MAINTENANCE MANUAL
(b)
Remove the nuts, washers and bolts.
(c)
Remove the bushings.
S 032-005
(2)
Remove the end of the spring from the pan assembly.
S 032-006
(3)
Slowly let the spring unwind until it rests against the valve door.
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