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Notices concerning the condition or change to any facility, service or procedure notified within the AIP. NOTAM are available in the form of Pre-Flight Information Bulletins (PIB) using a live database at the AIS website. 
AIS Information Line on tel: 0500 354802 or +44(0)20 8750 3939 
This service is offered by AIS to supplement the information available from the Website. A recorded message allows you to obtain up to date information on specific NOTAM, and will include Restricted Areas (Temporary), Airspace Upgrades & Emergency Restrictions of Flying.
UK Foreign IAIP Library 
Access to foreign aeronautical information, available to interested parties for flight planning purposes. 
AIS Website user guide
 
A pdf file covering all the above listed areas in detail is available here.
3. Airspace Classifications      
 

 
The airspace over the UK and surrounding waters from the surface to FL 245 is divided into two Flight Information Regions (FIR); the London FIR and the Scottish FIR. The airspace above the FIR is known as the Upper Flight Information Region (UIR). The airspace within the FIR/UIR is divided into different types using the ICAO Airspace Classification System. 
 
The ICAO Airspace Classification System
 
The ICAO Airspace Classification System consists of seven classes of airspace, each specifying minimum Air Traffic Service requirements and the services provided. The UK has adopted the ICAO System but for the present only six classes have been implemented. (*No airspace is designated Class B in the UK). Classes A, C, D & E are Controlled Airspace whilst for **Classes F & G Airspace the UK has registered differences from the ICAO Standard so as to allow greater flexibility to VFR flights at and below 3000ft amsl and to allow IFR flight in this airspace without the requirement to carry a radio.
 
 
Controlled Airspace – Visual depictions as per current UK VFR Charts:

 
 
 
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. *Note – no airspace is designated Class B in the UK
 

Class C. IFR and VFR flights are permitted, all flights are provided with air traffic control service and IFR flights are separated from other IFR flights and from VFR flights. VFR flights are separated from IFR flights and receive traffic information in respect of other VFR flights.

 
Class D. IFR and VFR flights are permitted and all flights are provided with air traffic control service, IFR flights are separated from other IFR flights and receive traffic information in respect of VFR flights, VFR flights receive traffic information in respect of all other flights.
　
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本文鏈接地址：Guide to Visual Flight Rules (VFR) in the UK(4)