E. Prepare for the Removal
S 864-031
WARNING: DO NOT OPERATE THE OUTFLOW VALVE DURING THE REMOVAL OR THE
_______ INSTALLATION. IF YOU OPERATE THE VALVE DURING THE REMOVAL OR THE INSTALLATION YOU CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(1) Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a) P6-4 Panel 1) PRESSURIZATION CONTROL (six locations) 2) OUTFLOW VALVE HEATER
F. Remove the Valve
S 944-003
(1)
Find the three fasteners forward of the valve and the three fasteners aft of the valve.
S 034-004
(2)
Put the bit in each fastener and turn the bit counterclockwise until it can not turn.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
CABIN PRESSURIZATION OUTFLOW VALVE
SEE A
AC
ACTUATOR
ELECTRICALDCCONNECTOR ACTUATOR
THERMOSTAT AFT LATCH (3)
SEE B
HEATED
GASKET
WIRES
ELECTRICAL
FWD INBD HEATED
CONNECTOR GASKET FWD LATCH (3) (NONROTATING LUGS)
OUTFLOW VALVE
A
HEATED GASKET
AFT
Cabin Pressurization Outflow Valve Figure 401 (Sheet 1)
SAFETY RELIEF VALVES
FWD ROTATING LUG
SCREWHEAD
AFT LATCH
B
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21-31-11
ALL ú ú 01 Page 402 ú Mar 15/88
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
Cabin Pressurization Outflow Valve
Figure 401 (Sheet 2)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
S 034-005
(3)
Push up and aft against the aft end of the valve, while you turn it about 1/4 turn.
S 034-006
(4)
Disconnect the electrical connectors on the forward side of each actuator.
S 034-007
(5)
Remove the heated gasket from the valve body (AMM 21-31-12/201).
S 024-008
(6)
Remove the valve through the opening and out of the airplane.
(a) Remove the bead seal from around the outflow valve opening.
WARNING: DO NOT GET SOLVENTS IN YOUR MOUTH, OR YOUR EYES, OR ON
_______ YOUR SKIN. DO NOT BREATHE THE FUMES FROM SOLVENTS. SOLVENTS ARE HAZARDOUS MATERIALS. SOLVENTS MAY BE FLAMMABLE OR HARMFUL TO THE ENVIRONMENT. REFER TO PRODUCT MATERIAL SAFETY DATA SHEETS (MSDS) AND LOCAL REQUIREMENTS FOR PROPER HANDLING PROCEDURES.
(b) Clean the area around the outflow valve opening with BMS 11-7, FCC-55, MEK:sec-butyl alcohol (42:58), MEK, or MPK.
TASK 21-31-11-404-009
3. Install the Outflow Valve for the Cabin Pressurization (Fig. 401)______________________________________________________
A. Equipment
(1)
Bit - Apex 212-5/16 inch, or equivalent
(2)
Spatula or flow gun
B. Consumable Materials
(1)
B00148 Solvent - Methyl Ethyl Ketone (MEK), TT-M-261
(2)
A00247 Sealant - BMS 5-95, PR 1436G (B-1/2 or B-2)
C. References
(1) AMM 21-31-12/201, Outflow Valve Heated Gasket
D. Access
(1) Location Zone
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