But the frame of the aircraft itself is to blame for the other half: the bumpy air flow over the undercarriage and the slots and flaps of the wings creates the rest of the racket.

而另一半的元凶则是飞机自身的结构问题：颠簸不平的气流穿梭过往时同起落架、翼缝和襟翼等结构相遇制造了另一半噪音。

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"The smoke plume of that fire extended some 14km (8.6 miles) into the air and even prevented us from getting aircraft overhead because of just how dangerous and bumpy the conditions were, " RFS Deputy Commissioner Rob Rogers was quoted by ABC News as saying.

BBC: News - Australia bushfire destroys homes and damages observatory