What is the floor of an airway unless otherwise specified?

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Multiple Choice

What is the floor of an airway unless otherwise specified?

Explanation:
The standard floor of low-altitude IFR airways (Victor airways) is 1,200 feet above ground level. These airways run between navigation aids and are defined as a corridor about 4 nautical miles either side of the centerline, from 1,200 ft AGL up to the base of Class A airspace at 18,000 ft MSL. “Unless otherwise specified” means there are charted segments where the floor is higher due to terrain or other designations, and you must check the IFR enroute chart for the exact base in those areas. So, the default floor is 1,200 ft AGL, making 1,200 ft AGL the correct answer.

The standard floor of low-altitude IFR airways (Victor airways) is 1,200 feet above ground level. These airways run between navigation aids and are defined as a corridor about 4 nautical miles either side of the centerline, from 1,200 ft AGL up to the base of Class A airspace at 18,000 ft MSL. “Unless otherwise specified” means there are charted segments where the floor is higher due to terrain or other designations, and you must check the IFR enroute chart for the exact base in those areas. So, the default floor is 1,200 ft AGL, making 1,200 ft AGL the correct answer.

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