What audiometric standard must a First-Class medical applicant meet under 14 CFR 67.105?
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A
Conversational voice test at 6 feet with both ears uncovered
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B
Average hearing threshold of 25 dB or better in each ear at 500, 1000, and 2000 Hz
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C
No hearing aid use permitted for any class of certificate
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D
Pure tone average of 40 dB or better across all tested frequencies