 This led to the Avro 730 undergoing a fairly substantial redesign to correspond with the new requirements being issued.Avro had anticipated this eventuality in their original submission.The envisioned test program was to have been quite thorough, which would have involved subjected full-scale aircraft to the severe temperatures anticipated at Mach 2.5 flight via a purpose-built heat chamber; upon reaching the flight testing phase, the prototypes had been scheduled to perform a total of 1,400 flight hours.