An airplane stalls when the flow of air across the air foils such as the wings is disrupted and is unable to produce the required lift. This occurs when the AOA exceeds the critical level and the air no longer smoothly flows over the top of the wing which causes a rapid reduction in the amount of lift. Prior to the critical AOA, the air pressure on the leading edge starts to shift from a positive air pressure area to a negative air pressure. The stall warning horn takes advantage of this and is positioned just prior to the critical AOA. When the region of negative air pressure crosses the stall warning opening, this causes the stall warning horn to go off which indicates that the critical AOA is approaching. This is why we all get to "suck" on those dirty stall horns.
An airplane stalls when the flow of air across the air foils such as the wings is disrupted and is unable to produce the required lift. This occurs when the AOA exceeds the critical level and the air no longer smoothly flows over the top of the wing which causes a rapid reduction in the amount of lift. Prior to the critical AOA, the air pressure on the leading edge starts to shift from a positive air pressure area to a negative air pressure. The stall warning horn takes advantage of this and is positioned just prior to the critical AOA. When the region of negative air pressure crosses the stall warning opening, this causes the stall warning horn to go off which indicates that the critical AOA is approaching. This is why we all get to "suck" on those dirty stall horns.
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