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To answer both your questions in the context of faa-regulations: First, "approved" in those sentences refers to the type of separation provided: "approved separation." This means separation that has been prescribed as being the best tradeoff between safety and efficiency, according to the bureaucrats who create the FAA's separation ...


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The Chart Supplement will describe only the surface-level airspace. If it says "...other times CLASS E" that means the Class E will begin at the surface. If it says "...other times CLASS G" that means the Class E will not start at the surface, and you will have to check the official airspace definitions (FAA JO 7400.11) to determine if ...


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"Approved separation" means any separation specified in FAA Order JO 7110.65, Air Traffic Control, that has a minima (a numerical value) attached to it. Like "6,000 feet and airborne" or "1,000 feet" for vertical separation, or "3 miles" for radar lateral separation. What about visual separation, you ask? Well, ...


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