SVFR operations may be authorized for aircraft operating in or transiting a Class B, Class C, Class D, or Class E surface area when the primary airport is reporting VFR but the pilot advises that basic VFR cannot be maintained.
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You should advise ATC before any altitude change when operating VFR-on-top. This ensures ATC can provide accurate traffic information and separation. VFR-on-top is not permitted in Class A airspace.
In class E airspace, IFR aircraft are controlled by ATC.This might be a center facility (Air Route Traffic Control Center) or approach/departure facility. As a VFR aircraft, you aren't required to be in contact with ATC, but IFR aircraft must operate on an ATC clearance. That means the airspace is controlled.
No person may operate an airplane over-the-top or at night under VFR unless that airplane is equipped with the instruments and equipment required for IFR operations under § 91.205(d) and one electric landing light for night operations. Each required instrument and item of equipment must be in operable condition.
Pilots who are flying basic VFR do not require a clearance to be in Class E airspace. Class E airspace below 14,500 feet MSL is depicted on VFR sectionals, IFR en route low altitude, and terminal area charts.
Class E4 and E3 airspaces do not require prior authorization, but Class E surface area (E2) airspace surrounds small airports and does require airspace authorization.