Setting the QNH question

[George Paton 1378950]

I'm fairly new to flight simming and have a quick question about when to switch to standard pressure and vice versa.

 

So for example I am flying out of Heathrow where a lot of the departures have an altitude restriction of 6000 ft which is also the transition altitude. So if i get to 6000 ft and hold there for 10 miles or so before I can start my climb do I switch to std QNH as soon as I get there, or when I leave the altitude and start my climb?

 

Same goes for the other way round, if a controller asks me to hold at a transition altitude (it hasn't happened to me, and i'm not sure if they will do this) do I switch from standard to local QNH as soon as I hit transition altitude, or when I leave and descend further?

 

Thanks for the help

[Matthew Burton 1270824]

Hello,

The transition altitude is still a altitude therefore you should still be on the local QNH. Once you are cleared to a Flight level, set standard pressure. The same with descending, when you get cleared down to a altitude (witch the transition altitude is), you should set the local QNH.

Hope this helps,

Matthew

[Trent Hopkinson]

If you are cleared to an altitude, you set local QNH

If you are cleared to a Flight level, you set Standard 1013/29.92