Ear, nose, throat, and equilibrium standards for a second-class airman
medical certificate are:
(a) The person shall demonstrate acceptable hearing by at least one of
the following tests:
(1) Demonstrate an ability to hear an average conversational voice in a
quiet room, using both ears, at a distance of 6 feet from the examiner,
with the back turned to the examiner.
(2) Demonstrate an acceptable understanding of speech as determined by
audiometric speech discrimination testing to a score of at least 70
percent obtained in one ear or in a sound field environment.
(3) Provide acceptable results of pure tone audiometric testing of
unaided hearing acuity according to the following table of worst
acceptable thresholds, using the calibration standards of the American
National Standards Institute, 1969: