QNH reset

[stenji]

Is it the altimeter qnh value supposed to be manually reset to standard pressure 29.92 above a certain altitude (i.e. 10.000 feet)? I know civilian pilots do that and below the altitude they switch it again to the arrival airport pressure value? Are military pilots do the same?

[Alleluia]

yes/depends on the flight scheduled

[stenji]

On 7/12/2024 at 9:50 PM, Alleluia said:

yes/depends on the flight scheduled

Is that happening in some DCS campaign maybe?

[IvanK]

Altimeters are set to Standard pressure STD (29.92/1013) above the the Transition Level. When set to STD altitudes are expressed as Flight Levels. so 35,000' would be referred to as FL350. When you descend through the Transition altitude local QNH (or QFE in some locations/countries) is set. Altitudes are then referred to as thousands of feet. If QNH (the most common world wide) is set then altitude is referenced to Sea Level. if QFE is set the altitude is referenced to Station elevation (i.e. Above Ground level).

The Transition altitude is not constant. It varies for a number of reasons Terrain elevation being one of them. In addition the exact point at which you physically set STD or QNH depends on whether you are climbing and or descending and local rules (national/civil/military). In Australia for example the transition altitude is 10,000'. So whilst climbing you set STD passing 10,000' whilst on descent you set it at FL110 (11,000').

[LG_Barons]

Am 4.10.2024 um 01:04 schrieb IvanK:

Altimeters are set to Standard pressure STD (29.92/1013) above the the Transition Level. When set to STD altitudes are expressed as Flight Levels. so 35,000' would be referred to as FL350. When you descend through the Transition altitude local QNH (or QFE in some locations/countries) is set. Altitudes are then referred to as thousands of feet. If QNH (the most common world wide) is set then altitude is referenced to Sea Level. if QFE is set the altitude is referenced to Station elevation (i.e. Above Ground level).

The Transition altitude is not constant. It varies for a number of reasons Terrain elevation being one of them. In addition the exact point at which you physically set STD or QNH depends on whether you are climbing and or descending and local rules (national/civil/military). In Australia for example the transition altitude is 10,000'. So whilst climbing you set STD passing 10,000' whilst on descent you set it at FL110 (11,000').

Good explanition, how ever slight mix up in the definiton of Transition Level and Transition Altitude.

You set the Transition Altitude when climbing. Setting the Transition Level when decending. (the "A" is poiting up - climbing, the "L" is pointing down - decending)
Almost every Country in Real World outside DCS has it own rules, as already explained above.

For DCS it depends what the server rule is or what the admin wants. 
Switching the Altimeter to different settings is important when flying under IFR Rules in IMC. If everybody is playing by the rules, you will not hit each other. 

So, flying SP around in DCS just fly with the local QNH or if you like the QFE. (but in Real World, most of the Pilots will not use QFE except Eastern European Countries) because it shows 0 ft only at the airport and around 10-15 NM. So if you are flying low level or in helicopters fly QFE. The Rest of the time with Weather or mountainous terrain use QNH. And TA and TL for most immersion.