Planespotterx From , joined Dec 1969, posts, RR: Posted (12 years 11 months 3 weeks 2 days 16 hours ago) and read 2347 times:
hi i was wondering wether any pilot or anyone could ask something thats been plagued on my mind for a few days now, how do you work out flight level.
eg FL300 is 30,000ft, so how do you work it out in like 3ft or 30ft, thanks.
ThirtyEcho From United States of America, joined Dec 2001, 1662 posts, RR: 1
Reply 4, posted (12 years 11 months 3 weeks 2 days 9 hours ago) and read 2255 times:
Flight levels only apply to altitudes above 18,000 feet. Since all flight above that altitude, up to 60,000 feet, is positive control airspace that means that all flights are under IFR rules. IFR altitudes are cardinal altitudes; i.e, 19,000, 20,000, 21,000, etc. This means that you can have a FL210 (21,000 feet) but not a FL215 (21,500). IFR altitudes are legally divided so that courses being flown (this is simplified) on the "right half" of the compass are odd altitudes and on the "left half" they are even altitudes. ATC can, and does, assign altitudes that do not follow this rule as they see fit.
NZ767 From New Zealand, joined Nov 2001, 1620 posts, RR: 1
Reply 9, posted (12 years 11 months 3 weeks 1 day 19 hours ago) and read 2193 times:
As stated before, altitudes above "transition level" are known simply as "flight levels".
All you do is drop the last two zeros.
Therefore, "30000 feet" becomes "flight level 300", "25000 feet" becomes "flight level 250" and so on.
Is that what you were after?
Transition level is where the pilots set their altimeters to the "standard altimeter setting" which is 1013.2 millibars or 29.92 inches of Mercury (depending on which scale is used in any given country) when climbing and to the local altimeter setting (Qnh) when descending.
Transition level differs around the world.
In the US, it's 18000 feet. In the UK it's 6000 feet. And here in NZ it's 11000 feet.
Hope this helps!!