Originally Posted by soaringhigh650
What if you're OCAS below a CAS shelf? Is it still 3000 feet?
Okay, by outside I should have specified outside laterally, not below a shelf
UK AIP (11 Feb 10) ENR 1-7-1 Civil Aviation Authority AMDT 2/10 ENR 1.7 — ALTIMETER SETTING PROCEDURES
1 Notification
1.1 The Selected Transition Altitudes listed in paragraph 4 are notified for the purposes of Rule 34 of the Rules of the Air
Regulations 2007.
3 General Procedures
3.1 The Transition Altitude within the UK is 3000 ft except in, or beneath, that Airspace specified at paragraph 4.1.
3.9 Airspace within all Control Zones (CTRs), and within and below all Terminal Control Areas (TMAs), Control Areas (CTAs)
except Airways and the Daventry and Worthing Control Areas, during their notified hours of operation, do not form part of the ASR
Regional Pressure Setting system.
3.10 When flying in Airspace below TMAs and CTAs detailed above, pilots should use the QNH of an adjacent aerodrome when
flying below the Transition Altitude. It may be assumed that for aerodromes located beneath such Areas, the differences in the 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.
4 Selected Transition Altitudes
4.1 The following Transition Altitudes apply to flights within or beneath the following Airspace:
Aberdeen CTR/CTA 6000 ft
Belfast CTR/TMA 6000 ft
Birmingham CTR/CTA 4000 ft
Bristol CTR/CTA 6000 ft
Cardiff CTR/CTA 6000 ft
Doncaster Sheffield CTR/CTA 5000 ft
Durham Tees Valley CTR/CTA 6000 ft †
East Midlands CTR/CTA 4000 ft
Edinburgh CTR/CTA 6000 ft
Glasgow CTR/CTA 6000 ft
Leeds Bradford CTR/CTA 5000 ft †
London TMA 6000 ft
Manchester TMA 5000 ft
Newcastle CTR/CTA 6000 ft
Scottish TMA 6000 ft
Solent CTA 6000 ft †
Sumburgh CTR/CTA 6000 ft †
† Note: Outside the notified hours of operation the Transition Altitude is 3000 ft.