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A 737-300/400/500MAINTENANCE MANUAL
BLOWOUT
PANELS
SEE B
PRESSURE
SEE A BLOWOUT PANEL EQUALIZATION VALVE
SEE C
FWD
FORWARD CARGO COMPARTMENT
SAFETY
A
PRESSURE AND RELIEF RELIEF VALVE VALVES
PASSENGER CABIN FLOOR
PRESSURE EQUALIZATION VALVE
SEE C CARGO COMPARTMENT LINING
BLOWOUT
PANELS
FWD
AFT CARGO COMPARTMENT
B
FLAPPERS
FWD C
Pressurization Relief Valves Location Figure 1
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A 737-300/400/500MAINTENANCE MANUAL
PEDESTAL
AND DISCHARGE PORT
A-A
Safety Relief Valve Schematic
Figure 2
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3.
4.
5.
A
737-300/400/500MAINTENANCE MANUAL
E. The safety relief valves are installed under the fuselage approximately below the aft right service door. One safety relief valve is installed on each side of the outflow valve.
Pressure and Relief Valve
_________________________
A. The pressure and relief valve prevents a negative pressure differential from becoming great enough to damage the airplane. The valve consists of a spring-loaded door which relieves automatically at a negative pressure differential. The valve is located forward and above the upper safety relief valve (Fig. 1).
Pressure Equalization Valves
____________________________
A. An equalization valve is provided at the aft bulkhead of each cargo compartment (Fig. 1). These valves keep the pressure in the cargo compartments and the cavities surrounding them at approximately the same pressure should the cabin pressure vary.
B. Each equalization valve contains two valve flappers. One flapper hinges away from the cargo compartment and the other hinges toward the cargo compartment. Each valve is accessible from within the cargo compartment where it is installed.
Blowout Panels
______________
A. Three blowout panels are located in the forward cargo compartment and two are located in the aft cargo compartment. These panels are designed to maintain isolation of the cargo compartments during normal service but will blow out to protect structure at a differential pressure of approximately 1 psi.
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