4000 feet AGL. 1200 feet AGL. 1200 feet MSL.
Understanding Airspace
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is required to file a flight plan. must use a visual observer. is required to receive ATC authorization.
The airspace reverts to Class E or a combination of Class E and G airspace during the hours the tower is not in operation. The airspace designation normally will not change.
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when the weather minimums are below basic VFR. when the associated control tower is in operation. when the associated Flight Service Station is in operation.