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Flight Levels FL...  
User currently offlinePlanespotterx From , joined Dec 1969, posts, RR:
Posted (14 years 4 months 2 weeks 6 days 7 hours ago) and read 3348 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.

9 replies: All unread, jump to last
User currently offlineXXXX10 From United Kingdom, joined Jan 2000, 779 posts, RR: 0
Reply 1, posted (14 years 4 months 2 weeks 6 days 6 hours ago) and read 3295 times:

Flight levels are only used above transition altitude-were the altimeter has the standard presure settings.

I doubt atc would issue cearance to an aircraft in increaments of lees thean 100 ft so the situation should not arise

User currently offlineApuneger From Belgium, joined Sep 2000, 3036 posts, RR: 10
Reply 2, posted (14 years 4 months 2 weeks 6 days 6 hours ago) and read 3291 times:

I think it is as follows:

during climb, at transition ALTITUDE: from ft. to FL
during descent, at transition LEVEL: from FL back to ft.

correct me if I'm wrong...

I think that in the US the transition altitude is 18 000 ft. In Europe it depends, but when I listen to BRU ATIS, I often hear transition levels of FL 55 and so...


Ivan Coninx - Brussels Aviation Photography
User currently offlineTimz From United States of America, joined Sep 1999, 7224 posts, RR: 7
Reply 3, posted (14 years 4 months 2 weeks 6 days 1 hour ago) and read 3262 times:

...but: on a standard day the air pressure at 30,000 ft is 4.3641 pounds per square inch. The definition of FL300 is simple: the altitude where the air pressure is actually 4.3641 psi.

User currently offlineThirtyEcho From United States of America, joined Dec 2001, 1741 posts, RR: 1
Reply 4, posted (14 years 4 months 2 weeks 6 days 1 hour ago) and read 3256 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.

User currently offlineContact_tower From Norway, joined Sep 2001, 536 posts, RR: 1
Reply 5, posted (14 years 4 months 2 weeks 5 days 23 hours ago) and read 3243 times:

"Flight levels only apply to altitudes above 18,000 feet", this is in the US only !!!!!!!!!!!!

Since many of the forum readers are non-us personell, I'll point it out, again.....

In the rest of the world the Trasition Level is mostly 2-5 thousand feet above min. sector altitude.

(ex Min.Sector Alt 2000ft => TL40-60)

 Big thumbs up

User currently offlineThirtyEcho From United States of America, joined Dec 2001, 1741 posts, RR: 1
Reply 6, posted (14 years 4 months 2 weeks 5 days 19 hours ago) and read 3226 times:

Uh, Contact_Tower, I was just trying to keep it simple for someone who appeared to be a novice or non-aviator.

User currently offlineTAA_Airbus From Australia, joined Nov 1999, 726 posts, RR: 0
Reply 7, posted (14 years 4 months 2 weeks 5 days 16 hours ago) and read 3207 times:

In Australia, transition is 10,000' thur to FL110.

I dont think anyone said this as yet, but when we are flying on Flight Levels, we have 1013.2 set on the subscale, or 29.9 (correct me if Im wrong ) depending which scale the altimeter uses!

User currently offlineModesto2 From United States of America, joined Jul 2000, 2898 posts, RR: 5
Reply 8, posted (14 years 4 months 2 weeks 5 days 12 hours ago) and read 3199 times:

29.92 is the standard barometric setting.

User currently offlineNZ767 From New Zealand, joined Nov 2001, 1620 posts, RR: 1
Reply 9, posted (14 years 4 months 2 weeks 5 days 11 hours ago) and read 3194 times:

Hi Planespotterx.

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!!

Mike-NZWN  Smile

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