QNH at level TA
Hello everyone,
In the London TMA the transition altitude is 6,000'. Most of the departures out of EGLL have you climbing to TA and you are not to climb above this until instructed by ATC. My question is this: Do you remain at QNH, since you have not been cleared above the TA or do you select STD 1013 when nearing/reaching 6,000'? My main confusion about this is that at some pressure settings you could be several hundred feet higher than 6,000' once you set the altimeter to STD. I also know different airlines have different SOPs regarding when to set STD.
I appreciate any information you all may have.
Cheers,
xfeed