S 862-054
(4)
Supply a 4 psig vacuum to the static system.
S 862-055
(5)
Isolate the vacuum.
S 982-056
(6)
Make a record of the initial pressure.
S 982-057
(7)
After 1 minute make a record of the final pressure.
S 782-058
(8)
Make sure that the leakage rate (initial pressure minus final pressure per minute) is less than 0.1 psi over a 1 minute period.
S 782-059
(9)
If the leakage rate is more than 0.1 psi, find and repair the leak then do the leak check again.
S 862-060
(10)
Put the static system back to ambient pressure.
S 082-061
(11)
Disconnect the pitot/static tester from the static port adapter.
S 082-062
(12)
Disconnect the static port adapter from the static pressure port.
TASK 21-32-01-902-021
5. Replace the Relief Valve Filter (Fig. 201)
_______________________________
A. References
(1) AMM 06-46-00/201 Entry, Service and Cargo Door Access Doors and Panels
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A
757
MAINTENANCE MANUAL
REMOTE SENSOR PORT
POSITIVE PRESSURE RELIEF VALVES
OUTSIDE SKIN
A21010 VACUUM TANK - PRESSURE RELIEF VALVE TEST
Positive Pressure Relief Valve Test Setup Figure 202
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
(2)
AMM 25-50-02/401, Sidewall Lining Panels
B.
Access
(1)
Location Zone
153 Aft cargo compartment (Left)
C.
Prepare for the Removal/Installation
S 012-027
(1)
Open the aft cargo door, 822 (AMM 06-46-00/201).
S 012-028
(2)
Remove the left sidewall lining that is 6 feet aft of the forward bulkhead of the aft cargo compartment (AMM 25-50-02/401).
S 012-029
(3)
Remove the duct(s) necessary to get access to the relief valve filters.
D.
Remove the relief valve filters.
S 032-030
(1)
Pull the filter cover off of the valve.
S 022-031
(2)
Pull the filter out of the valve.
E.
Install the relief valve filter
S 422-032
(1)
Put the filter into the relief valve.
S 432-033
(2)
Push the filter cover onto the relief valve until it snaps into position.
F.
Put the airplane back to its usual condition.
(1)
Install the duct(s) that were removed to get access to the filters.
S 412-025
(2)
Install the left sidewall lining in the aft cargo compartment (AMM 25-50-02/401).
S 412-026
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
S 412-024
(3) Close the aft cargo door, 822 (AMM 06-46-00/201).
TASK 21-32-01-702-038
6. Positive Pressure Relief Valve Test (Boeing Test Equip A21010-57) (Fig. 202)
_________________________________________________________________
A. Equipment
(1)
Vacuum Tank - Pressure Relief Valve Test, A21010-57 or subsequent.
(2)
Air compressor or air source - capable of 60-80 psi. at 22 scfm, commercially available
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