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There is no Class B Airspace in the UK FIR and Class C only exists above FL195. To accommodate VFR and military autonomous operations above FL 195 Temporary Reserved Areas (TRAs) have been introduced. TRAs are notified volumes of airspace within which ATS will be provided in accordance with UK Air Traffic Services Outside Controlled Airspace (ATSOCAS) rules. The dimensions and activation times of these TRAs are detailed in the UK AIP ENR 5.2.
 
 
VFR flight outside Controlled Airspace (Classes F and G Airspace)
 
       At and above FL 100
        Below FL 100
        At or below 3000ft
 
. 8 km flight visibility

 
. 1500m horizontally from cloud

 
. 1000ft vertically from cloud*

 
 
 . 5 km flight visibility

 
. 1500m horizontally from cloud

 
. 1000ft vertically from cloud

 . As per below FL 100….or….

 
. Fixed wing aircraft: 5 km flight visibility; Clear of cloud and in

               sight of the surface.
 
. For fixed wing aircraft operating at 140kt or less: 1500 m flight visibility; Clear of cloud and in sight of the surface.

 

 
For helicopters operating at a speed which, having regard to the visibility, is reasonable: 
Clear of cloud and in sight of the surface.
 
 
B. Speed Limitations
 
Below FL100, an airspace speed limit of 250kt applies. In addition, this limit may be lower when published in procedures or when required by ATC.
 
 

C. Flight Plan Requirements
 
A Flight Plan is required for flights in all Controlled Airspace except Class E. In certain circumstances the Flight Plan requirement may be satisfied by passing flight details on RTF (see page 30). A Flight Plan comprises sufficient information to enable an ATC Unit to issue a clearance and for search and rescue purposes (Rule 29 of UK Air Navigation Order refers).
 
 
D. ATC Clearance and ATC Instructions
 
 ATC Clearance is required for flight in all Controlled Airspace except Class E, and compliance with ATC instructions is mandatory.
 
 In Class E Controlled Airspace pilots of VFR flights are strongly recommended to make their presence known to the appropriate ATC Unit and comply with ATC instructions.
 
 Outside Controlled Airspace an aircraft receiving a service from an ATC Unit is expected to comply with ATC instructions unless the pilot advises otherwise.
　
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本文鏈接地址：Guide to Visual Flight Rules (VFR) in the UK(6)