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6. Passenger Cabin Sidewall Panels
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A. Dado vent box modules are installed at various locations along the cabin sidewall in place of the dado panels. The vent box module incorporates a dado panel and a louvered air grille as part of a hinged and spring-loaded door. Normal airflow is through the air grille louvers. However, in the event of rapid cabin decompression the hinged door swings back into the sidewall to provide additional venting.
7. Depressurization Panels (Fig. 1)
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A. The forward compartment depressurization panels are nomex cores with fiberglass facings and are mounted in the bulkhead on each side of the E/E bay access door. The panels are held in place by springs and brackets which allow the panels to swing aft, creating an opening through which air will flow (Ref 25-52-00).
B. The blowout panel for the aft cargo compartment is a 0.012-inch thick sheet of aluminum foil covering an air passage in the frame at the aft end of the compartment below floor level. The foil sheet is cemented to the frame by eight dots of adhesive to allow limited breakaway strength.
8. Inflight Depressurization Venting Components
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A. Floor panel mounted depressurization blowout panels are installed in selected areas on the main deck. The panels are protected by wire grille cages (AMM 53-21-07/601).
B. The sidewall dado vent boxes in the cabin area are installed in the sidewall. Dado vent box modules are spring-loaded hinged panels designed to swing back into the panel to provide additional venting (AMM 25-21-01).
C. The cargo compartment sidewall linings in the forward and aft compartments are designed to serve as depressurization panels. The attachment allows the panel to blow inward to allow airflow into the compartment.
D. AIRPLANES WITH DECOMPRESSION VENTS IN THE LOWER LOBE CARGO COMPARTMENT; There are decompression vents on the sidewall lining in the fwd and aft cargo compartment. They are protected by the flow thru vent.
E. The ceiling linings in the bulk cargo area are designed to serve as depressurization panels. The attachment allows the panels to blow downward to allow airflow into the compartment.
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Depressurization Panels
Figure 1
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DEPRESSURIZATION BLOWOUT PANEL - REMOVAL/INSTALLATION
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1. General
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A. This procedure has two tasks, one for the removal and one for the installation of the depressurization blowout panel.
B. It is necessary to replace the aluminum foil of the depressurization blowout panel when the differential pressure is sufficient to break the foil.
C. The depressurization blowout panel will be referred to as the blowout panel.
D. The blowout panel is found in the bulkhead between the containerized cargo area and the bulk cargo area, below the floor level. The access is from the containerized cargo area.
E. It is necessary to remove the ball transfer panel between the floor beams and the bulkhead. You must do this to get access to the blowout panel which is near the bulkhead.
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