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INTERNAL STORES HEATING SYSTEM The S-3 aircraft internal stores heating sub-system is shown in figure 1-14.
Crew compartment exhaust air from the cabin outflow valve is directed into the sonobuoy compartment ducting. Part of the exhaust air goes to the cross-fuselage manifold for channeling into the three sonobuoy compartments. The balance branches forward through the bomb bay heating ducting to feed the two bomb bays. The bomb bay duct separates into
two branches, one to each bomb bay. Air enters the bomb bays at the aft end, traverses the bomb bay, and exits through louvres at the forward end of each bomb bay. In overheat conditions, a bomb bay overheat thermal switch lights a warning indicator on the annunciator panel. Air enters each sonobuoy compartment through the sonobuoy support channels around the top of the sonobuoys. Exhaust air from the sonobuoy compartments is restricted by its passage through the plenum panels, creating a pressure differential between the sonobuoy compartments and the out-side ambient air. This internal pressure inhibits cold ambient air inflow through the plenum panel openings.
Figure 1-14.- Internal stores heating subsystem.
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