Originally Posted by
nitpicker330
Regarding the possible report of reaching FL450.
This was from Primary radar data readings and estimations.
Today at FL380 our actual GPS ALT was 40,300'
So a 2,300' difference, this I've seen on every flight and can be up to 2,500' difference.
It's therefore reasonable that the 45,000' primary radar altitude above sea level was up to 2,500' above the Aircrafts pressure Altimeter reading of FL425 to 430. Hence the A/C wasn't as high as we think?
Not that it matters much.
Good point. Pressure altitude is NOT the actual altitude.