Engine Air Tests
GOG your engineering terminology re "Giving an engine a good thrash" comes across as amateur or even ignorant! Nothing you do on the ground will tell you if an engine will accept an idle to full power slam at 170 kts, 40K feet and -60C. I appreciate that I am talking about military engine air tests with which I am familiar and know that this is not the sort of treatment that would given to an airliner!