(turbo's info copy-paste)
Turbo wrote in Wed Feb 18, 2015 10:43 pm:the TL should be higher than the TA
Turbo wrote:therefore currently OR is wrong as it giving me a TL lower than the TA.
Turbo wrote: Also currently the system does not take in account the QNH it is always -500 feet bellow TA.
mickybadia wrote in Thu Feb 19, 2015 10:31 am:If QNH is around 1030 hPa and your TA is 3,000 ft, it is normal to have TL=FL025. And that is *above* TA.
simbambim wrote in Sun Feb 22, 2015 10:13 pm:mickybadia wrote in Thu Feb 19, 2015 10:31 am:If QNH is around 1030 hPa and your TA is 3,000 ft, it is normal to have TL=FL025. And that is *above* TA.
How is that?
ICAO DOC 4444 PANS-ATM (pg. 4-9): wrote:4.10.2 Determination of the transition level
4.10.2.1 The appropriate ATS unit shall establish the
transition level to be used in the vicinity of the aerodrome(s)
concerned and, when relevant, the terminal control area
(TMA) concerned, for the appropriate period of time on the
basis of QNH (altimeter sub-scale setting to obtain elevation
when on the ground) reports and forecast mean sea level
pressure, if required.
4.10.2.2 The transition level shall be the lowest flight
level available for use above the transition altitude established
for the aerodrome(s) concerned. Where a common transition
altitude has been established for two or more aerodromes
which are so closely located as to require coordinated
procedures, the appropriate ATS units shall establish a
common transition level to be used at any given time in the
vicinity of the aerodrome and, when relevant, in the TMA
concerned.
skybrary.aero wrote:In Europe and much of the rest of the world, the transition altitude varies from airport to airport. Again, it is a fixed value and is published on the airport documentation, approach plates, AIP etc. The transition level will "float" with the QNH and, again, the TL is the lowest assignable level (pressure altitude) that will guarantee minimum vertical separation from an aircraft at the highest assignable altitude using local QNH.
the transition altitude [...] is a fixed value and is published on the airport documentation [...]. The transition level will "float" with the QNH
the TL is the lowest assignable level (pressure altitude) that will guarantee minimum vertical separation from an aircraft at the highest assignable altitude using local QNH
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