NEEDING HELP> COLD START> ALTITUDE READINGS IS INCORRECT.....

[mouaherbert]

hello Guys !

 

I have a question! when I cold start the FA-18 I have noticed my altitude reads at 1,xxxx feet ? but i am still on the ground ? should it not be like 0 feet ? or only 20 feet ?

Am I doing something wrong at start up ???

and sometime very rare after a cold start it will reads 20 feet and if NOT it will read 500 feet to 1000.. ( on ground level )

 

does this happened to you ? is this a bug and not yet fixed ?

 

thank you,

[Stingray 537 Mongo]

The altitude on the HUD defaults to standard pressure (29.92in Hg). If your missions have custom weather with different altimeter settings, that will impact what the baro pressure on the HUD would read.

 

Sent from my Pixel 3 XL using Tapatalk

 

 

[mouaherbert]

The altitude on the HUD defaults to standard pressure (29.92in Hg). If your missions have custom weather with different altimeter settings, that will impact what the baro pressure on the HUD would read.

 

Sent from my Pixel 3 XL using Tapatalk

 

 

 

hi, thank you for your fast response

but how do I fix this ? is this normal for all of you or do you adjust it then saved...

 

thank you

[Stingray 537 Mongo]

You adjust your altimeter setting using the rotary knob on the standby altimeter below the right DDI.

 

Sent from my Pixel 3 XL using Tapatalk

 

 

[rob10]

hi, thank you for your fast response

but how do I fix this ? is this normal for all of you or do you adjust it then saved...

 

thank you

 

Briefing or ATC will give you the correct altimeter setting and you can enter it with the knob on the bottom right of the altimeter. Or you can cheat and adjust the setting until you get a zero altitude (QFE) or the correct altitude for that airport (QNH I think). If you're at a higher altitude airport (Neliis AFB on the Nevada map for example) you're at about 1868 ft and your altimeter will reflect that. Many of the Caucus airports are at a fairly low altitude so they'll show you 40 or 50 ft. It will be different for different altitudes but also different based on the barometer pressure set in the mission.

You should do some reading on "Barometric altitude" to get an understanding of it because it's a pretty fundamental concept in all aviation.

[shagrat]

That is absolutely normal and nothing to "fix". You need to adjust your altimeter to the weather conditions, but

most important is to understand the difference between barometric altitude (or sometimes referred to as pressure altitude) and Radar altitude. Barometric is the altitude calculated from your pitot tube and Radar altitude is usually up to 5,000 ft max and shows the height above the terrain directly under your aircraft.

 

If you Google for "pitot tube", "QNH", "QFE" and "QNE" you should find enough info to start.

 

 

[Foka]

And you should remeber that when you fly above 5000 ft you should switch to standard altimeter (29,92), and then when you report initial you'll receive from ATC actual QFE and you should set you altimeter to local atmospheric pressure.