Do they need some special clearance? Yes, you can fly VFR over the top of a cloud deck as long as you can maintain 1,000 ft.above the clouds. No clearance is necessary, however you still are flying VFR and must see and avoid other aircraft.
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The only regulatory restriction is that student pilots are not allowed to fly above a cloud layer without ground reference. VFR over-the-top can be a very useful tool to get above a cloud layer instead of flying in haze or restricted visibility below the clouds.
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.
Most commercial jetliners have a service (or certificated) ceiling of about 42,000 ft (12.8 km; 8.0 mi) and some business jets about 51,000 ft (15.5 km; 9.7 mi). Before its retirement, the Concorde supersonic transport (SST) routinely flew at 60,000 ft (18.3 km; 11.4 mi).
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.
As a general answer, flights at altitudes at and above 18,000 feet (5.49 km) above mean sea level require flight plans. Nevertheless, for flights at lower altitudes in both controlled and uncontrolled airspace, the need for a flight plan is not mandatory across most of the airspace in the United States.
In some countries, VFR flight is permitted at night, and is known as night VFR. This is generally permitted only under more restrictive conditions, such as maintaining minimum safe altitudes, and may require additional training as a pilot at night may not be able to see and avoid obstacles.
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.
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.
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.
Why Do Pilots Prefer IFR Over VFR? IFR provides pilots with greater flexibility when it comes to controlled airspace, weather conditions, and career opportunities.
Private pilots first learn to fly using VFR. The next step for private pilots is to start training for their instrument rating. Some commercial planes conduct their flying VFR. On short flights this can save them time and money by getting direct routing and flying any altitude they would like.
VFR over-the-top (OTT) refers to flying over top of clouds in visual flight, rather than with reference to instruments. This is usually done for brief amount of time to avoid weather or turbulence.