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Unless safety is likely to be compromised, a pilot shall not change heading or level without first obtaining approval from the controller.
 
Procedural Service
 
A Procedural Service is a non surveillance ATS where, in addition to the provisions of a Basic Service, the controller provides instructions, which if complied with, shall achieve deconfliction minima against other aircraft participating in the Procedural Service. Neither traffic information nor deconfliction advice can be passed with respect to unknown traffic.
 
The controller will expect the pilot to accept levels, radials, tracks and time allocations that may require flight in IMC. A pilot who is not suitably qualified to fly in IMC shall not request a Procedural Service unless compliance permits the flight to be continued in VMC.
 
A Procedural Service is available at all levels and the pilot remains wholly responsible for terrain clearance at all times.
 
A controller will provide deconfliction instructions by allocating levels, radials, tracks, and time restrictions, or use pilot position reports, aimed at achieving a planned deconfliction minima. The pilot shall inform the controller if he elects not to act on the controller’s deconfliction advice, and therefore accepts responsibility for initiating any subsequent collision avoidance against the aircraft in question and any other aircraft affected.
 
The controller will provide traffic information on conflicting aircraft being provided with a Basic Service and those where traffic information has been passed by another ATS unit; however, there is no requirement for deconfliction advice to be passed, and the pilot is wholly responsible for collision avoidance.
 
Unless safety is likely to be compromised, a pilot shall not change level, radial, track, or time restriction without first obtaining approval from the controller. If a level, radial, track, or time restriction is unacceptable to the pilot, he shall advise the controller immediately.
 
Air Traffic Control Centres (ACC)
 
Basic Service is also provided by ACCs (Callsign London Information and Scottish Information) through an FIS Officer (FISO) operating on specially allocated RTF channels. In addition to the normal Basic Service, described above the FISO will:
 
(a) On receipt of a request for joining or crossing clearance of Controlled Airspace or Advisory Routes either:

 
. Inform the pilot that he should change frequency in time to make the request direct to the appropriate ATC Unit at least 10 minutes before ETA for the entry or crossing point

 
Or
 
. Obtain the clearance from the appropriate ATC Unit himself and pass it to the pilot on the FIR frequency.

 

(b) Pass ETA to destination aerodromes in special circumstances, such as diversions, or at particular locations when traffic conditions demand it. Normally, however, pilots who wish destination aerodromes outside Controlled Airspace to have prior warning of arrival should communicate direct with ATC at the aerodrome concerned, at least 10 minutes before ETA.
　
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本文鏈接地址：Guide to Visual Flight Rules (VFR) in the UK(26)