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A Special VFR clearance may be requested without the submission of a full flight plan. However, brief details of the proposed flight are required to be passed to the appropriate ATSU before a SVFR clearance is issued.
 
 
SVFR Regulations
 
In the UK, VFR flight is not permitted at night. That means that every pilot who flies in uncontrolled airspace between evening civil twilight and morning civil twilight must follow the Instrument Flight Rules. 
 
In the Air Navigation Order, Rules of the Air, Rules 33, 35, 36 and 37 lay down the rules for IFR flight within controlled airspace, including the filing of a flight plan and the obtaining and obeying of an air traffic control clearance. Pilots without an instrument rating are normally prohibited from flying under IFR in controlled airspace, although an IMC rating will suffice in Class D and E airspace in the UK. However, flight may be possible with a ‘Special VFR’ clearance in some control zones.
 
Clearance for Special VFR flight in the UK is an authorisation by ATC for pilots to fly within a Control Zone although they are unable to comply with IFR. In exceptional circumstances, requests for Special VFR flight may be granted for aircraft with an all-up weight exceeding 5700 kg and capable of flight under IFR. Special VFR clearance is only granted when traffic conditions permit it to take place without hindrance to the normal IFR flights, but for aircraft using certain notified lanes, routes and local flying areas, special conditions may be applied – pilots should refer to the AD 2 Section of the UK AIP for details.
 
 
 

 
 
SVFR Flight Planning Requirements
 
If intending to take advantage of SVFR privileges, pilots must ensure that ATC understands their requirements and any limitations that might affect their ability to accept the clearance given to them.   A Full FPL is not required for a Special VFR flight, but ATC must be given brief details of the call sign, aircraft type and pilot’s intentions. These details may be passed either by RTF or, at busy aerodromes, through the Flight Clearance Office. 
 
A Full FPL must be filed if the pilot requires the destination aerodrome to be notified of the flight. The CA48 flight plan should be filed as normal, with “I” as the flight rules written in Item 8 (IFR). Any part of the route in which the pilot requires SVFR clearance must be clearly stated, and Item 15 is suitable to show this requirement. When completing Item 15, designate the point(s) on the boundary of controlled airspace at which you intend to enter or leave, and write “SVFR” as your routeing within the control zone. Once in radio contact, if you are unable to accept flight in IMC, you must inform ATC.
 
 
Special VFR Clearance
 
Requests for Special VFR clearance to enter a Control Zone, or to transit a Control Zone, may be made to the ATC authority whilst airborne. Aircraft departing from aerodromes adjacent to a Control Zone boundary and wishing to enter may obtain Special VFR clearance either prior to take-off by telephone or by RTF when airborne. In any case, all such requests must specify the ETA for the selected entry point and must be made 5-10 minutes beforehand.
　
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本文鏈接地址：Guide to Visual Flight Rules (VFR) in the UK(42)