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Apart from the exceptions listed at paragraph above when flying at or below the Transition Altitude below TMAs and CTAs, pilots should use the QNH of an adjacent aerodrome. It may be assumed that for aerodromes located beneath such Areas, the differences in QNH values are insignificant. When flying beneath Airways whose base levels are expressed as Altitudes, pilots are recommended to use the QNH of an adjacent aerodrome in order to avoid penetrating the base of Controlled Airspace.
 
Within Channel Islands Control Zone, the lowest forecast QNH value is available for terrain clearance purposes.
 
Pilots operating north of 6130N within the airspace detailed in UK AIP Section ENR 2.2, when not receiving a service from Sumburgh Radar are advised to use the Puffin RPS when flying at or below 3,000ft.
 
The QNH settings to be used in the Northern North Sea Radar Service Areas are shown on chart  ENR 6.1
 
Selected Transition Altitudes
 
The following Transition Altitudes apply to flights within or beneath the following airspace:
 
Aberdeen CTR/CTA 6,000ft  Glasgow CTR  6,000ft
Belfast CTR/TMA  6,000ft  Leeds Bradford CTR/CTA 5,000ft*
Birmingham CTR/CTA 4,000ft  London TMA 6,000ft
Bristol CTR/CTA 6,000ft Manchester TMA 5,000ft 
Cardiff CTR/CTA 6,000ft  Newcastle CTR/CTA 6,000ft
Durham Tees Valley 6,000ft* Scottish TMA 6,000ft
East Midlands CTR/CTA 4,000ft  Solent CTA 4,000ft*
Edinburgh CTR/CTA 6,000ft  Sumburgh CTR/CTA  6,000ft*
 
* Note: Outside the notified hours of operation the Transition Altitude is 3000ft.

 
Terrain Clearance Table
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 Regional QNH (FL)
 
 
 
 ASR
 Highest Obstacle (Ft)
 Minumum Altitude (Ft)
 1032+
 1014-1031
 995-1013
 977-994
 960-976
 953-959
 927-942
 
 
 
  
  
  
  
  
  
  
  
  
  
 
 
 
 WESSEX
 2907
 4300
 40
 45
 50
 55
 60
 65
 70
 
 
 
 Scillies
 1378
 2400
 20
 25
 30
 35
 40
 45
　
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本文鏈接地址：Guide to Visual Flight Rules (VFR) in the UK(29)