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RRUltrafan wrote:In the flight sim I use, after I take off, the checklist tells me to set barometers to 'STD' as required. What does STD stand for? I can't seem to find any information on it by googling it. And why is the standard QNH setting 1013.25 hPa or 29.92 in Hg?
RRUltrafan wrote:In the flight sim I use, after I take off, the checklist tells me to set barometers to 'STD' as required. What does STD stand for? I can't seem to find any information on it by googling it. And why is the standard QNH setting 1013.25 hPa or 29.92 in Hg?
vhqpa wrote:Transition altitudes in a couple of different countries:
Netherlands TA - 3,000' (or is it 4,000'?)
CosmicCruiser wrote:I remember France giving it on the ATIS. In fact there were 2 times I had a little issue with the F/O being a little complacent. We were descending into CDG and were told to descend to 70 or 7,000, I missed it. I asked the F/O which was it and he replied "I think it was 7,000". I said to ask to be sure. It was fl70! Another time it was a perfect set up fo a mistake. Again going into CDG we were descending below the transition and our chk list called for "altimeters". Ironically the the QNH was 992mb so I had mine set and the F/O just replied "992". He was flying and hadn't made the change from QNE 9.92!(which means he hadn't made the change to 1013 at 30west) As we went thru 4,000' I caught it and brought the jet back up to 4,000. Thankfully CDG app. never said anything and all was well. I reminded the F/O when outside the US ALWAYS reply to altimeter settings in inches or MB. I also began the habit of checking the F/O's altimeter too.
UK was always very low too; like 3,000. We had a couple of guys bust altitudes when asked to level off just passed the transition in a very light wgt MD-11!
I was always told it's 18,000 in the US because that's the 500mb lvl.
vhqpa wrote:Transition altitudes in a couple of different countries:
Australia TA - 10,000' TL - FL110
New Zealand TA - 13,000' TL - FL150
United Kingdom TA - 6,000'
France TA - 5,000'
Germany TA - 5,000'
Netherlands TA - 3,000' (or is it 4,000'?)
Denmark TA - 5,000'
Sweden TA - 5,000'
Norway TA - 7,000'
USA TA - 18,000' TL - FL180
Canada TA - 18,000' (I pressume TL is FL180 like the US)
AFAIK Some countries have pre defined Transition Levels others are set by ATC depending on atmospheric conditions.
RRUltrafan wrote:In the flight sim I use, after I take off, the checklist tells me to set barometers to 'STD' as required. What does STD stand for? I can't seem to find any information on it by googling it. And why is the standard QNH setting 1013.25 hPa or 29.92 in Hg?
TOGA10 wrote:CosmicCruiser wrote:I remember France giving it on the ATIS. In fact there were 2 times I had a little issue with the F/O being a little complacent. We were descending into CDG and were told to descend to 70 or 7,000, I missed it. I asked the F/O which was it and he replied "I think it was 7,000". I said to ask to be sure. It was fl70! Another time it was a perfect set up fo a mistake. Again going into CDG we were descending below the transition and our chk list called for "altimeters". Ironically the the QNH was 992mb so I had mine set and the F/O just replied "992". He was flying and hadn't made the change from QNE 9.92!(which means he hadn't made the change to 1013 at 30west) As we went thru 4,000' I caught it and brought the jet back up to 4,000. Thankfully CDG app. never said anything and all was well. I reminded the F/O when outside the US ALWAYS reply to altimeter settings in inches or MB. I also began the habit of checking the F/O's altimeter too.
UK was always very low too; like 3,000. We had a couple of guys bust altitudes when asked to level off just passed the transition in a very light wgt MD-11!
I was always told it's 18,000 in the US because that's the 500mb lvl.
I think this is a perfect example of why stuff like this needs to be standardised! Thanks for your reply.
Semaex wrote:RRUltrafan wrote:In the flight sim I use, after I take off, the checklist tells me to set barometers to 'STD' as required. What does STD stand for? I can't seem to find any information on it by googling it. And why is the standard QNH setting 1013.25 hPa or 29.92 in Hg?
The standart setting (29.92 inHG in the US, 1013.25 hPA in most other countries) exists because it relates to the "standart atmosphere" determined by the international meteorological society.
This "standart atmosphere" is measured at sea level and has a certain pressure (as mentioned) and a certain temperature (15°C). These values were chosen because they are about an average of your typical atmosphere on a given day at about 40° latitude.TOGA10 wrote:CosmicCruiser wrote:I remember France giving it on the ATIS. In fact there were 2 times I had a little issue with the F/O being a little complacent. We were descending into CDG and were told to descend to 70 or 7,000, I missed it. I asked the F/O which was it and he replied "I think it was 7,000". I said to ask to be sure. It was fl70! Another time it was a perfect set up fo a mistake. Again going into CDG we were descending below the transition and our chk list called for "altimeters". Ironically the the QNH was 992mb so I had mine set and the F/O just replied "992". He was flying and hadn't made the change from QNE 9.92!(which means he hadn't made the change to 1013 at 30west) As we went thru 4,000' I caught it and brought the jet back up to 4,000. Thankfully CDG app. never said anything and all was well. I reminded the F/O when outside the US ALWAYS reply to altimeter settings in inches or MB. I also began the habit of checking the F/O's altimeter too.
UK was always very low too; like 3,000. We had a couple of guys bust altitudes when asked to level off just passed the transition in a very light wgt MD-11!
I was always told it's 18,000 in the US because that's the 500mb lvl.
I think this is a perfect example of why stuff like this needs to be standardised! Thanks for your reply.
I'm all for standardisation! However, countries which are in general at higher altitudes will not exactly profit from a lower transition altitude.
Same as countries with lots of VFR traffic in the lower airspace (ie US -> TA 180)
And countries with a lot of IFR traffic in the lower airspace (anywhere in Europe) will also not be able to adhere to local altimeter settings every couple of minutes or when crossing a border.
TOGA10 wrote:Semaex wrote:RRUltrafan wrote:In the flight sim I use, after I take off, the checklist tells me to set barometers to 'STD' as required. What does STD stand for? I can't seem to find any information on it by googling it. And why is the standard QNH setting 1013.25 hPa or 29.92 in Hg?
The standart setting (29.92 inHG in the US, 1013.25 hPA in most other countries) exists because it relates to the "standart atmosphere" determined by the international meteorological society.
This "standart atmosphere" is measured at sea level and has a certain pressure (as mentioned) and a certain temperature (15°C). These values were chosen because they are about an average of your typical atmosphere on a given day at about 40° latitude.TOGA10 wrote:I think this is a perfect example of why stuff like this needs to be standardised! Thanks for your reply.
I'm all for standardisation! However, countries which are in general at higher altitudes will not exactly profit from a lower transition altitude.
Same as countries with lots of VFR traffic in the lower airspace (ie US -> TA 180)
And countries with a lot of IFR traffic in the lower airspace (anywhere in Europe) will also not be able to adhere to local altimeter settings every couple of minutes or when crossing a border.
No, I'm happy with a different TL/TA, this is depicted on charts anyway, but I meant, we should all adhere to either hecto pascal or inHg. Pretty much everything else is standard in the western world, why not this? Then again, weather report in the US are with VIS in SM as well, so maybe not as standard as one would hope.
Starlionblue wrote:Don't forget metric flight levels in China.
TOGA10 wrote:And countries with a lot of IFR traffic in the lower airspace (anywhere in Europe) will also not be able to adhere to local altimeter settings every couple of minutes or when crossing a border.