According to my info, transition level is determined by ATC and provided along with the ATIS, or given to the crew when requesting descent.(or published on the approach chart)

Eg: ATC clears an a/c from FL080 to 3000' without specifying a transtion level. There is no ATIS and the chart says transition level: by ATC (transition alt: 3500').

When does the crew set QNH on the altimeters??
There's a case of beer on this and I'm willing to share the spoils. Can anyone tell me where to find the legal answer in writing.

patches

When out of FL80 and not asked to report through a crossing FL.

mmmm, i can taste those cold ones already....
any idea where to find the proof of that? doc 8168 somewhere?

Details of your roster so I can get the beer please.

Check http://www.pprune.org/forums/showthr...ight=altimeter (via search )

............and this refers you to 5.3.1 of the UK AIP EnRoute section which covers UK procedures.

Outside UK, you should ALWAYS check the local 'differences' in altimeter setting from UK/ICAO procedures in case they are different.

Be aware that many countries have a fixed transition level/altitude, eg. USA 180, Oz F110/A100, SIN F130/A110 etc. Actually, the set when cleared are in the minority world wide, thank God - what's the matter with the regulators setting a fixed T/L and T/A?