Attached is a rudimentary cross section of free stream air through the forward
fuselage voids without lower cowl ducting.
>From experience flying in a mono with wheel fairing fitted; with ANR switched
on at the time there was no detectible change in cabin noise volume compared to
flying in 181. However the degree off air flow through the cockpit was greatly
multiplied due to the wheel well being mostly sealed off during flight; not
fitting the rear portion of the fairing will greatly diminish this ventilation
feature.
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