What are the limitations of VFR-on-top?

A VFR-On-Top clearance has its limitations. Here are a few you need to follow: Pilots may not fly below minimum en route IFR altitudes because you could crash into the terrain. Minimum en route altitudes exist regardless of IFR or VFR weather conditions and weather assigned a specific altitude or VFR conditions on top.



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VFR-on-top is not permitted in Class A airspace.

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The VFR Cruising Altitude rule does not apply below 3,000 feet AGL. There are some altitudes, however, that pilots seem to choose for level flight. Close to sea level they are 1000, 1500, 2000 and 2500. They are easy to read and remember on an altimeter.

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VFR aircraft also must maintain a horizontal distance of 1sm from clouds while operating in Class E at and above 10,000ft. Below 10,000ft, the increase in TAS is reduced due to the lower altitudes. Therefore, the minimum forward flight visibility can be reduced from 5sm to 3sm.

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ATC will not authorize VFR or VFR-on-top operations in Class A airspace.

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A series of Navy and Air Force programs in the 1950s and 1960s used pressure vessels or pressure suits to get balloonists higher, some to above 100,000 feet. Skydiver Nicholas Piantanida set an unofficial record—123,500 feet—in 1966, but a later attempt went awry when his helmet depressurized.

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The maximum height that a commercial airplane is allowed to reach when they fly is 42,000 feet, as this is the universally approved maximum altitude. This max altitude for airplanes is known as the “service ceiling.” Most commercial air jets fly at such a high altitude because it is known to optimize efficiency.

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This brings us to IFR (instrument flight rule) pilots. IFR flying is astronomically more challenging than VFR flying, but those pilots who achieve this distinction are invariably more equipped to fly IFR and VFR. Aviating under IFR, a pilot is authorized to fly into clouds in what is called zero visibility.

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Why Do Pilots Prefer IFR Over VFR? IFR provides pilots with greater flexibility when it comes to controlled airspace, weather conditions, and career opportunities.

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Symbols shown are for World Aeronautical Charts (WAC), Sectional aeronautical charts and Terminal Area Charts (TAC). When a symbol is different on any VFR chart series, it will be annotated thus: WAC or Not shown on WAC.

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