kontiki
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- May 30, 2011
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Kontiki
Hi all,
I'm trying to understand what I've run into with IFR flying under FL180 with ATC.
Transponder reports pressure altitude. I use true altitude as my altitude reference, per FARs.
Sometimes ATC gets on the horn to ask me about my altitude. OK, I'm using a good baro correction; I'm within 100 ft of alt per my altimeter. ATC sees me 200ft off altitude.
Does ATC use some kind of barometric correction for lower altitude IFR aircraft, would they understand if I told them I'm using MSL and they are seeing pressure altitude?
Have I got it wrong? How can they assign altitudes to within 500 ft if were not all using the same system?
Thanks,
I'm trying to understand what I've run into with IFR flying under FL180 with ATC.
Transponder reports pressure altitude. I use true altitude as my altitude reference, per FARs.
Sometimes ATC gets on the horn to ask me about my altitude. OK, I'm using a good baro correction; I'm within 100 ft of alt per my altimeter. ATC sees me 200ft off altitude.
Does ATC use some kind of barometric correction for lower altitude IFR aircraft, would they understand if I told them I'm using MSL and they are seeing pressure altitude?
Have I got it wrong? How can they assign altitudes to within 500 ft if were not all using the same system?
Thanks,