In my experience, when an aircraft is cleared by an ATC for air-work in a designated location, it is usually also asked to "report on completion" of the air-work.
"If" this aircraft was cleared for only one orbit (as stated in the quoted recent press release and as reported previously) 24-minutes-long radio silence from both sides appears to me to be rather unusual....
Last edited by Antek22QR; 30th May 2012 at 09:05.