In theory, a pilot can operate in sub-VMC conditions under IFR without an ATC clearance in Class G airspace. However, to enter or operate in controlled airspace under IFR, an ATC clearance is required.
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Class A. IFR flights only are permitted, all flights are provided with air traffic control service and are separated from each other. Class B. IFR and VFR flights are permitted, all flights are provided with air traffic control service and are separated from each other.
Class G airspace (uncontrolled) is that portion of airspace that has not been designated as Class A, Class B, Class C, Class D, or Class E airspace. Rules governing VFR flight have been adopted to assist the pilot in meeting the responsibility to see and avoid other aircraft.
Like Class E airspace, you can fly through Class G airspace at airports (the terminal environment) and while en-route. However, Class G airspace isn't controlled. Neither VFR (Visual Flight Rules) nor IFR (Instrument Flight Rules) aircraft need an ATC clearance to operate in Class G airspace.
You haven't flown through IMC without a clearance, have you? Technically, you can fly in IMC without a clearance in Class G airspace, because it's not controlled. Controlled airspace simply means you need a clearance to fly in the clouds. Class G airspace is uncontrolled, so it's not illegal to fly in the clouds.
Pilots are required to hold a UK licence to fly G-Reg aircraft in the UK. Pilots can hold a UK Part-FCL at the same time as a Part-FCL issued by an EASA member state or any other ICAO licence. For information on how to obtain a UK licence without claiming credits, please see our Professional Pilot Licences webpages.
Many pilots prefer IFR over VFR because they can fly regardless of the weather conditions. They aren't constrained by the VFR minimums you saw above. Also, IFR flying, with enough practice, makes navigation much simpler.
Transponders Needed for Class G AirspaceFor the most part, pilots flying in Class Golf airspace do not need a Mode C transponder, ADS-B Out function, or even specific communication equipment. One of the few exceptions is that a Mode C transponder and ADS-B Out are required if flying above 10,000 feet MSL.
There's no takeoff clearance needed without a tower, but until you get the OK, the release, from approach, you can't depart IFR. So you'll then readback that clearance and they'll say “Cessna 9334H readback correct advise ready for departure.” And they may ask you which runway you're going to depart from.
Class C or D airspace (at or below 2,500 feet agl within 4 nm of the primary airport) — 200 kias (unless a higher speed is specifically approved by ATC) Class E or G airport traffic pattern — 200 kias (recommended)
General. Class G airspace (uncontrolled) is that portion of airspace that has not been designated as Class A, Class B, Class C, Class D, or Class E airspace. VFR Requirements. Rules governing VFR flight have been adopted to assist the pilot in meeting the responsibility to see and avoid other aircraft.
A Cessna 150 can be IFR certified if equipped with the 20 or more instruments and devices specified under section 91.205 of the Federal Aviation Regulations (FARs). The exact equipment configuration depends on the route to be flown. Other recency requirements also apply.
On a map, Class G's ceiling is the floor of Class E airspace. And, it's always exclusive. For example, if Class E starts at 700 feet AGL, Class G goes up to, but doesn't include, 700 feet AGL. Class G airspace is most easily found on a sectional map when a fading, thick blue line appears.