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From the dreamliner latest article from Les Abend.
One can't quite see the whole picture, but it is a conic object hanging by a cable from the tip of the tail. What is that?
It is a small parachute-like device, I believe it is used to evaluate the air flow movements during flight test. But I'm not sure.
Yes, it is an airflow probe, Boeing use these on all their test aircraft. Mostly it comes out at the top of the vertical Stab. If you look at any B747 before the -400 series you will see a blanking cap just above the APU exhaust. This is for the airspeed probe and was, strangely, still fitted at production, along with the nylon tube which ran forward thru the rear pressure bulkhead.