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All I know is that I wouldn't buy a second hand car from Crumpp lol

Quote:

Look under METAR and be advised it changes with conditions. It will vary from 597-600 depending on which site you check.

What I said....

The field elevation is under the METAR tab on the link.....

http://www.checkwx.com/wxmain/fullsite/EGKB

be advised it changes with conditions.

Of course it changes with conditions, wow!! :confused:

Your altimeter is just an aneroid barometer.

Readings are taken periodically. That reading is converted to sea level. To do that requires putting the raw data through some formula's that are not dead on accurate.

The actual pressure is generally not static for very long either and changes with the passage of time. Lapse rate is also not standard either.

If you read FAR 91.121, it plainly states the order of precedence you take in setting your altimeter. The station pressure takes precedence over the field elevation.

Quote:

(1) Below 18,000 feet MSL, to—

(i) The current reported altimeter setting of a station along the route and within 100 nautical miles of the aircraft;

(ii) If there is no station within the area prescribed in paragraph (a)(1)(i) of this section, the current reported altimeter setting of an appropriate available station; or

(iii) In the case of an aircraft not equipped with a radio, the elevation of the departure airport or an appropriate altimeter setting available before departure; or

(2) At or above 18,000 feet MSL, to 29.92″ Hg.

http://www.gleim.com/aviation/faraim...afNum%3D91.121

Why? If everyone is at the same altimeter setting then you are on the same scale.

Setting the atimeter to field elevation is close to the altitude scale everyone is using but it is not dead on accurate.

The elevation will vary depending on when the readings were taken, where, and which formula's were used to and the standard of accuracy for all but the most busiest and largest of airports is within 10 feet.

If you set your altimeter to the pressure given on ATIS/ADIS then it will rarely be the exact same as the field elevation.

Your eyes and instincts kind of take over at a distance above and close to the runway when it is seen well...your not watching the gauge to countdown to the setting its at:grin:

Wow....now Crumpp is qoting himself, and still linking to a hobby website.

Crumpp, here is the MEATR for Biggin hill (the official one) not one decoded on a hobby website.......decode it and tell me where the elevation data is.

EGKB 091720Z 22011KT 190V250 9999 FEW035 16/09 Q1011

p.s. you have a couple of professional pilots on this forum waiting with baited breath to see what you come up with.

Quote:

Crumpp I really don't think that anyone uses the current weather readings to set it, with the possible exception being the military (don't know). Your eyes and instincts kind of take over at a distance above and close to the runway when it is seen well...your not watching the gauge to countdown to the setting its at

You most certainly do reset your altimeter to the current settings before you take off and it does change while enroute. It is the very first thing ATC will give you at the hand off after radar contact.

It is absolutely essential to safe flight.

Quote:

Originally Posted by Crumpp (Post 433279)

Of course, I got my elevation from an aeronautical information site.

Look under METAR and be advised it changes with conditions. It will vary from 597-600 depending on which site you check.

Here it is 600 today:

http://www.checkwx.com/wxmain/fullsite/EGKB

Crumps post that he quoted himself from.....

Quote:

Originally Posted by Crumpp (Post 433522)

Crumpp don't try and pretend you are talking about QNH now, you have claimed that airfield elevations change hourly according to the conditions and the data is taken from metars.

Quote:

Originally Posted by Crumpp (Post 433522)

I was taught to set it to the destination from the chart value, while en route and close. I realize it could be advised differently, elsewhere in the world.:grin:

Quote:

Q1011

QNH 1011mb

Quote:

Originally Posted by SlipBall (Post 433526)

I was taught to set it to the destination from the chart value, while en route and close. I realize it could be advised differently, elsewhere in the world.:grin:

Are you talking about setting field elevation on the pressurisation system? we usually add 100 feet to ensure the cabin is depressurised before touchdown.