A mounting device 10 for securing a microphone pick-up head 12 flush with respect to the external surfaces of the skin 14 of an aircraft A for detecting shock waves passing thereover. The mount includes a sleeve 30 mounted internally of the aircraft for capturing and supporting an electronics package having the microphone pick-up head attached thereto in a manner such that the head 12 is flush with the external surface of the aircraft skin and a pressure seal is established between the internal and external surfaces of the aircraft skin.
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