Acoustic neuromas, benign tumors that grow in the inner ear that can cause hearing loss, ringing in the ears (tinnitus), and disequilibrium similar to vertigo, also are disqualifying until reviewed by the FAA. Meniere's disease is a particular problem for pilots because of the quick onset and severity of symptoms.
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Yes, an individual who is deaf can obtain a pilot certificate in one of the five categories of aircraft: airplane, rotorcraft, glider, powered-lift, or lighter-than-air.