S 725-007
(3) Do the test for the other safety relief valve.
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A
737-300/400/500MAINTENANCE MANUAL
SAFETY RELIEF VALVE FILTER - REMOVAL/INSTALLATION
_________________________________________________
1. General_______
A. This procedure has two tasks. The first task gives instructions for the removal of the filter on the safety relief valve. The second task gives instructions for the installation of the filter on the safety relief valve.
B. The filter for the safety relief valve must be discarded. The filter prevents the contamination of the control chamber of the relief valve from the used air of the passenger cabin.
TASK 21-32-22-004-001
2. Safety Relief Valve Filter Removal (Fig. 401)__________________________________
A. Access
(1) Location Zone
220 Aft Cargo Compartment Equipment Bay
B. Procedure
S 014-016
(1)
Remove the aft bulkhead panel (right) in the aft cargo compartment to get access to the safety relief valves.
S 014-003
(2)
Push down on the filter cover and turn it counterclockwise.
(3)
Remove the filter cover.
(4)
Remove the filter and the packing.
S 014-014
S 024-004
TASK 21-32-22-404-005
3. Safety Relief Valve Filter Installation_______________________________________
A. Standard Tools and Equipment
(1) G00507 Cloths - Lintfree (AMM 20-30-51/201)
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737-300/400/500MAINTENANCE MANUAL
SAFETY RELIEF VALVE (2 LOCATIONS)
SEE A
CABIN PRESSURIZATION
OUTFLOW VALVE
(REF)
AFT BULKHEAD
PANEL (REF)
EQUALIZATION
VALVE (REF)
FILTER AND
COVER AFT CARGO
SEE B COMPARTMENT (REF)
SAFETY
RELIEF
VALVE
COVER
GASKET FILTER
PACKING CLAMP
SAFETY RELIEF VALVE
PEDESTAL
FILTER AND COVER
AMBIENT
B
SENSE TUBE
SAFETY RELIEF VALVE FWD INBD
A
Safety Relief Valve Filter Installation Figure 401
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737-300/400/500MAINTENANCE MANUAL
B. Consumable Materials
(1) B00081 Solvent - Trichloroethylene, MIL-T-27602 (AMM 20-30-31/201)
C. References
(1) AMM 21-32-21/501, Safety Relief Valve
D. Access
(1) Location Zone
220 Aft Cargo Compartment Equipment Bay
E. Procedure
S 214-006
(1)
Examine the space for dirt where you will install the filter.
S 114-007
(2)
Do these steps to clean the space for the filter if it is necessary:
CAUTION:_______DO NOT SEAL THE ORIFICE IN THE CENTER OF THE SPACE. IF THE ORIFICE IS SEALED, THE SAFETY RELIEF VALVE WILL NOT OPERATE CORRECTLY.
(a)
Clean the space with a lintfree cloth which is moist with the solvent.
(b)
Rub the space dry with a lintfree cloth.
S 434-008
(3)
Put the packing on the filter.
S 424-009
(4)
Install the filter into the space for the filter.
S 414-010
(5)
Put the filter cover on the filter.
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