Simviation Forum

Jul 14^th, 2004 at 10:39pm

juanca Offline
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I'm from Honduras....

Depart from Toncontin Intl.;
ATIS tells me altimeter is 29.92;
I flew to Mexico and the ATIS again gave me Altimeter 29.92 ???,
then i flew to KMIA and guess what was the altimeter.......29.92 Roll Eyes

I noticed this flying to Mexico cause I saw land really close and I was at my cruise altitude. and I almost crashed with a mountain.....

any comments or suggestions???
Please

Juanca

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Reply #1 - Jul 14^th, 2004 at 10:54pm

Nexus Offline
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yes, fly with real world weather enabled.

Don't understand what you mean with the "I was at my cruise altitude. and I almost crashed with a mountain....."

Regardless of QNH pressure, your altimeter (29.92)would've read correctly if you flew on your cruise altitude since you should be above Transition altitude?

Regards

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Reply #2 - Jul 15^th, 2004 at 8:19pm

juanca Offline
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can anyone please tell me why the millibar dont change?
29.92 even at everest the altimeter is 29.92!!!!!!!!!!!

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Reply #3 - Jul 15^th, 2004 at 8:53pm

Webb Ex Member
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29.92 is used to calibrate your altimeter. It equals sea level air pressure at your location.

Your altimeter will calculate your altitude based upon an assumed sea level pressure of 29.92.

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Reply #4 - Jul 15^th, 2004 at 10:42pm

juanca Offline
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???Yes I have an Idea on what the millibars in the altimeter are used for, my question is.. why dont it change.
Its the same everywhere.

Now I'm no pilot, but I'm sure that the airpressure changes if I'm in Mexico or if I'm in Miami

And ATIS (for each reagion) keeps giving an altimeter of 29.92 wether I'm in Peru or Khagkagstan!!!!!!! Wink

Please tell me if I'm wrong, but dont you have to manually calibrate the altimeter so that you dont have false altimeter readings every airport you intend to land.
or else you'll be hittin groung a lot sooner of later than you thought

Because all airports are at different altitudes an so diferent air pressure ( calibration is a must)
But in this vrtual world 29.92 is everywhere....... Roll Eyes

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Reply #5 - Jul 15^th, 2004 at 11:17pm

Webb Ex Member
I Like Flight Simulation!

It is the same everywhere because you use default weather settings. If you download real world weather you will see changes.

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Reply #6 - Jul 15^th, 2004 at 11:59pm

YodaNYC Offline
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New York City

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Webb is correct. When you set up a flight in the flight planner, make sure to change the current weather conditions to real world weather. During your flight at altitudes below FL180, ATC will update you as to the current altimeter setting. You should also program the ATIS frequency of your arrival airport into the COMM radio so that you can up to date altimeter settings and weather conditions. Using real worl weather also allows you to use all runways depending on the wind conditions.

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Reply #7 - Jul 16^th, 2004 at 2:46pm

Gogi Offline
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Novosibirsk, Russia

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What is 29.92, 29.91, 29...... mean?

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Reply #8 - Jul 16^th, 2004 at 3:02pm

Webb Ex Member
I Like Flight Simulation!

http://www.usatoday.com/weather/resources/askjack/wfaqpres.htm

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Reply #9 - Jul 16^th, 2004 at 3:18pm

garymbuska Offline
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Quote:

What is 29.92, 29.91, 29...... mean?

It is the barometric pressure 29.92 is usually a clear sky. As the number goes down is when you have to worry the lower the number the worst the weather gets this is a low pressure system. Hurricanes & thyphons are the worst of the low pressure systems.

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Reply #10 - Jul 16^th, 2004 at 3:20pm

Gogi Offline
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Novosibirsk, Russia

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Ok I'm just not used to inches and miles.
meters, santimeters, kilometers 8)

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Reply #11 - Jul 16^th, 2004 at 8:26pm

Webb Ex Member
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A little strange from a Texan, but you could re-set the functions to European measurements - if millibars would suit you better than inches of mercury.

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Reply #12 - Jul 17^th, 2004 at 10:05am

Gogi Offline
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Novosibirsk, Russia

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Quote:

A little strange from a Texan, but you could re-set the functions to European measurements - if millibars would suit you better than inches of mercury.

that way i'll be more confused then now already 8)

I'm not a really Texan, I just live there or here.
I'm from Russia.

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