The C-130 testbed. When is anybody's guess. I believe that Marshall Aerospace have to do 30 hours of ground tests before it takes to the skies. Given there has been reported problems with the TP400 again, it looks like it will be delayed for a while (and the first A400M was due to fly in October... pah!) with Flight Global reporting at the beginning of August that the C-130 had only undertaken four hours of ground tests.