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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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本文链接地址：Guide to Visual Flight Rules (VFR) in the UK(29)
