After several investigations into the various causes of injuries effected by noise in the airplane on the mechanical and phisical point of view, we have noted that among the aerial sound, noises in the airplaine is decreasing by appearance of plain with pressure cabin and jet plane. And now we must notice on the correspondence soudd and its backnoise.
We studied also the way of physical examination of air-crew. As one of this, it is proper, we think, that we take pure-tone-audiometry mainly and speech-audiometry supplementally at the entrance examination, and speech-audiometry at the terminal test.
As to the improvement of correspondence-machine, measures from a side of engineering is desired hereafter. And also it is suitable for pilot to use the ear-defender with receiver.
As apersonal care, we think tinittus is a symptom of injuries for long duration, and so if a pilot is conscious of tinittus, it is necssary to give him a rest.
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