Originally Posted by
Daniel_11000
the small static ports few meters upstream of the cone measure the absolute static pressure at flying altitude, so I cannot understand the need to calibrate through tower fly-by, probably it was the aircraft static ports which were calibrated and compared to cone static port pressure.
You need to confirm somehow that the trailing cone sensors are far enough behind the a/c that they really are measuring the "absolute static pressure at flying altitude". If there's a wake effect because the cone is too short, this is the only way to find out.