Special visual flight rules

Special visual flight rules (Special VFR, SVFR) are a set of aviation regulations under which a pilot may operate an aircraft. It's a special case of operating under visual flight rules (VFR).

Use in different regions

The definition for SVFR may be different in different countries, depending on the local aviation regulations.

ICAO definition

The ICAO definition of Special VFR flight is a VFR flight cleared by air traffic control to operate within a control zone in meteorological conditions below visual meteorological conditions.[1]

United States

According to Federal Aviation Regulations, SVFR operations can only be conducted in the controlled airspace around an airport where that controlled airspace extends down to the surface (so-called surface area). SVFR can only be conducted below 10,000 feet MSL in such areas.[2][3]

SVFR at night requires an IFR-equipped aircraft and an IFR-rated pilot in command ("IFR" means Instrument flight rules). In helicopters, there is no minimum flight visibility requirement, or a requirement for an IFR-equipped aircraft or an IFR-rated pilot in command.[2]

Other countries


Flight under SVFR is only allowed in controlled airspace, and always requires clearance from air traffic control (ATC).[4] It usually happens under two circumstances:

[6]

Equipment requirements and weather minimums

The aircraft need not necessarily be equipped for flight under IFR, and the aircraft must remain clear of clouds with the surface in sight, and maintain a certain flight visibility minimum (1,500 metres according to ICAO, one statute mile in the US, 1,500 m visibility, in sight of surface and clear of cloud in Europe). The pilot continues to be responsible for obstacle and terrain clearance.[7]

An example of the use of SVFR is when a flight wishes to leave an airport in controlled airspace, to fly VFR in uncontrolled airspace, when the visibility is below the minimum for VFR flight in the control zone but not below the lower minimum for VFR flight in uncontrolled airspace. SVFR is never offered by Air Traffic Control. It must be requested by the Pilot in Command.

gollark: Again, this is probably easier to do technologically.
gollark: Yes, but only for 22μs.
gollark: Any advice on making *useful* supersoldiers would be appreciated for my ~~evil world domination program~~ world optimization program™, since nobody seems to want to *elect* me as supreme world dictator for life.
gollark: You could probably also give people tetrachromia, but again, it only seems marginally useful.
gollark: We have technological night vision goggles. Which are probably cheaper than genetically engineering people.

See also

References
  1. Annex 2
  2. 14 C.F.R. 91.157
  3. "Order JO 7110.10U "Flight Services"". FAA. 10 March 2011. Section 4-5 "Special VFR Operation". Archived from the original on 2 November 2009. Retrieved 29 March 2011.
  4. https://www.law.cornell.edu/cfr/text/14/91.157
  5. https://www.faa.gov/regulations_policies/handbooks_manuals/aviation/phak/media/17_phak_ch15.pdf
  6. ICAO Annex 2
  7. Using Special VFR and Conctact Approach, Disciples of Flight, 23 Dec 2014
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