737 Max test plane

I have seen this on all Boeing test planes, does this provide information on the planes performance?

  • 2
    $\begingroup$ Already answered here and here, at least. $\endgroup$
    – mins
    Jun 6, 2021 at 11:00

1 Answer 1


That’s a trailing cone. It hangs out behind the aircraft and serves to calibrate the aircraft’s pitot-static system against static pressure error by providing a static source for ambient air pressure data in clean air well clear of the aircraft. The cone is connected to the aircraft by high-strength pressure tubing to feed the data to the aircraft.


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