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Reduced Vertical Separation Minimum (RVSM) is defined as the reduction of vertical space between aircraft from 2,000 to 1,000 feet at flight levels from 29,000 feet up to 41,000 feet.
Added 12/29/2015 2:24:19 AM
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"Radiotelephony" means transmission of sound (audio) by radio.
Added 12/29/2015 2:25:52 AM
This answer has been confirmed as correct and helpful.