"Scott Moore" wrote in message
news:yjstc.9901$Ly.7087@attbi_s01...

Light airplanes unlucky enough to have high altitude capability would
need both mode-s and UAT. This would also apply to a huge number of

Do you know the definition of high-altitude capability?

A turbocharged piston airplane may very well be capable of flying above
FL300 although it is rare for piston airplanes to actually do so.


--------------------
Richard Kaplan, CFII

www.flyimc.com