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In the US, is there much variation among the practices followed by the various ARTC Centers and Approach Control facilities as to where a Special VFR clearance may be granted?

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Yes there is. Note the range of comments below obtained from questions posed by telephone to various ARTC Center staffers-- in most cases, the "Watch Officer" on duty, or else an "Airspace Specialist"--

(The summaries below are based on written notes and are not verbatim transcriptions. The airspace descriptions are not from the staffers but rather are from the FAA's "Airspace Descriptions And Reporting Points" document, JO 7400.11C.)

Facility-- Harrisburg Approach (PA)

Airport: KLNS-- Lancaster-- PA

Airspace description-- Part-time Class D, turns to E2 when tower closes. E4 "extension" to SE, becomes part of the E2 when tower closes.

Staffer stated that when tower is closed, Harrisburg Approach may issue SVFR clearance for the entire "surface area", which does include the airspace in the "extension", because it goes down to the surface, whether the tower is open or closed. In response to my questioning, said it has nothing to do with whether the airspace is E2 or E4-- it's all "Echo" to them. Said tower is only authorized to issue SVFR clearance for the Class D airspace, but if tower contacted Harrisburg Approach with a request, odds are good a SVFR clearance could be granted for the E4 extension as well. Stated tower has to call Harrisburg Approach anyway when granting a SVFR clearance so it would not be a burden to ask. Noted that S37 is within the E4 extension so a pilot flying from KLNS to S37 might have good reason to want a SVFR clearance including the extension.


Facility-- Seattle Center ARTCC

Airport-- KACV-- Arcata CA

Airspace Description-- E2 circle around airport effective 24/7, E4 "extension" to SE effective 24/7, depicted as separate areas on the sectional chart--

Staffer said a SVFR clearance could indeed include the entire Class-E-to-surface area. In response to my questioning, stated made no difference whether the airspace was E2 or E4.


Facility-- Salt Lake City ARTCC

Airport-- KSHR --Sheridan County-- WY

Airspace description-- E2 airspace, effective 24/7, extends far to NW and SE of airport

Staffer's initial response was that a SVFR clearance would be limited to a certain radius from the airport such as 5 miles, but after taking a closer look at the sectional chart said a SVFR clearance could indeed include the entire Class-E-to-surface area. Stated that since the area is quite large, let ARTCC know if you only need the northern part or the southern part.

The staffer also offered opinions on the airports below, while noting that they are not actually in the Salt Lake City ARTCC area of responsibility--

Airport-- KBIH -- Bishop-- CA

Airspace Description-- E2 circle around airport effective 24/7, E4 "extensions" to N effective 24/7, all depicted by a single dashed magenta line on the sectional chart--

Staffer said a SVFR clearance could indeed include the entire Class-E-to-surface area. In response to my questioning, stated made no difference that extensions were E4 not E2.

Airport-- KTVL-- South Lake Tahoe-- CA

Airspace Description-- E2 circle around airport effective 24/7, E4 "extension" to N effective 24/7, depicted as separate areas on the sectional chart--

Staffer said a SVFR clearance could indeed include the entire Class-E-to-surface area. In response to my questioning, stated made no difference that extensions were E4 not E2.


Facility-- Minneapolis ARTCC

Airport-- KSTC-- St. Cloud MN

Airspace description-- Part-time Class D, turns to E2 when tower closes. E4 "extension" to SE, becomes part of the E2 when tower closes.

Staffer stated that tower could only issue a SVFR clearance for the Class D airspace, but if tower were closed and pilot contacted Center, a SVFR clearance might be able to include the extension to SE. Wasn't sure about this, said no one had ever asked. Noted that there is small airport just inside the far end of the extension so there might be reason to desire such a clearance. Was unfamiliar with designations E2 and E4 and planned to do more research on the topic.


Facility-- Oakland Center

Airport-- KBIH-- Bishop CA

Airspace Description-- (Winter configuration) -- E2 circle 5 miles in diameter around airport effective 24/7, E4 "extensions" to N effective 24/7, all depicted by a single dashed magenta line on the sectional chart--

(Summer configuration is class G up to 1200 feet at least in inner circle)

Regarding the winter configuration, staffer said a SVFR clearance would not be granted beyond 5 miles of the airport because the purpose of a SVFR clearance is just to get pilots up away from the airport or down into the airport, and the terrain to the north is mountainous so they don't want pilots flying SVFR there. Also stated that the purpose of the extensions is to facilitate instrument arrivals and departures so they wouldn't want pilots flying SVFR there. Said even in a case where terrain were flat they likely would not grant SVFR beyond a certain radius from the airport conforming to the basic inner Class D or Class-E-to-surface circle, because the extensions are to facilitate instrument arrivals and departures. In response to my questioning, said it had nothing to with whether the airspace in the extensions was E2 or E4.


Facility-- Kansas City ARTCC

Airport-- KTOP-- Phillip Billard near Topeka KS

Airspace description-- Part-time Class D, turns to E2 when tower closes. E4 "extension" to SE effective 24/7.

Staffer stated that a SVFR clearance could not include the extension because the purpose of a SVFR clearance is just get to pilots up away from the airport or down into the airport and if you can't do it within the D circle you should file IFR or not fly. Stated that the purpose of the extension is to protect IFR traffic, so they wouldn't want to issue a SVFR clearance there. In response to my questioning, stated made no difference that the airspace in the extension was E4 rather than E2 -- they just call it "Echo" and don't make that distinction. Comments were not specific only to KTOP but also stating the general principle involved.


In essence, whether or not SVFR clearance will ever be granted for a specific chunk of Class-E-to-surface airspace that projects some distance from the basic circle of controlled-to-surface airspace around the airport, seems very much to depend on the "culture" of the particular Center involved, as well as factors such as terrain hazards specific to the particular geographic location involved.


See related questions, answers--

In actual practice, do ARTC Center personnel generally follow the rule that a SVFR clearance may be granted in E2 airspace but not E4 airspace? (US)

Does an SVFR clearance extend to Echo surface extensions?

Does an SVFR clearance extend to Echo surface extensions?

Does FAR 91.155c apply to class E surface extensions?

Which parts of class E airspace can an ultralight (part 103) fly in without prior ATC authorization?

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