What kind of Test
There are not many things that you do to an Aircraft during maintenance that require an air test. In this particular case was there anything that was being tested during the accident event that was mandated in the maintenance manuals? Or was this a test 'created' to act as somekind of handover from one operator to another? When you buy a second hand car you will often take the car for a test ride. But what are you testing? Is there a parallel between this and handing back an Aircraft. There are no legal requirements (are there?) for transferring an a/c nor maintenance requirements (usually) so what tests will make the new operator 'happy'. Was this whole event avoidable if the transfer took place in the hangar with a good old kick of the tyres?