Good day

I do understand what is QNH and how to use it 

But  Lately and i dont like this  FSX tip keeps Poping up after i take off and tells me QNH should Be 1013  

So my Question is when i Depart any Airport and after 5000ft do i need to swich back to 1013 QNH or just stay i the one that the Deparching airport gave me ??

Also do i need to do the same thing on the other Altimeter 

https://www.flickr.com/photos/119910503@N05/13283723185/


and on this PIC when do switch to and from STD    i normally do  it above Transition altitude 

https://www.flickr.com/photos/119910503@N05/13284109594/

Many thanks

Transition altitudes (departures) and transition levels (arrivals) are either published or issued by ATC, so they really depend on circumstances.

 

You can disable 'show flying tips' in the FSX options to stop this message from popping up.

Thanks But still my Question has not been answered 

 

Do i need to switch Transition altitudes  after Departure ???

In the US it is standardized at 18,000'.  All you need to know is at skybrary:

 

http://www.skybrary.aero/index.php/Transition_Altitude/Level#Europe

Thanks But still my Question has not been answered 

 

Do i need to switch Transition altitudes  after Departure ???

You depart with the local altimeter setting altimeter setting which you can find from ATIS or from ATC or by pressing the "B" key.

 

When you climb ABOVE transition altitude (you will find it on the airport charts), you change the altimeter setting to STANDARD (1013).

 

You should change both captain and F/O altimeters plus the standby.

 

Peter

Peter, just to clarify, I believe you should switch to standard (1013) once cleared to a flight level, to avoid  a "level bust" in the situation when for example the transition altitude is 6000ft and the QNH is 970mbs, a clearance to Flight Level 70, would mean leveling  around 5800ft QNH. 

The same is true in reverse, when descending to an altitude. But nothing to stop you putting another pressure on a spare altimeter for terrain awareness etc.

Eugene

Thanks to All Now My Question has been Answered 

 

many thanks

Peter, just to clarify, I believe you should switch to standard (1013) once cleared to a flight level, to avoid  a "level bust" in the situation when for example the transition altitude is 6000ft and the QNH is 970mbs, a clearance to Flight Level 70, would mean leveling  around 5800ft QNH. 

The same is true in reverse, when descending to an altitude. But nothing to stop you putting another pressure on a spare altimeter for terrain awareness etc.

Eugene

I appreciate that barometric pressure extremes can produce the situation you describe. However, if you are climbing above transition altitude (when I said the OP should change to standard) that does rather imply he has been cleared to a FL.