 In order to meet the timetable set by the RCAF , Avro decided that Arrow program would adopt the Cook @-@ Craigie plan ; effectively eliminating the prototype phase , the first test airframes were constructed on production jigs . Any changes would be incorporated into the jigs while testing continued , with full production starting when the test program was complete . As Jim Floyd noted at the time , this was a risky approach , however : " ... it was decided to take the technical risks involved to save time on the programme ... I will not pretend that this philosophy of production type build from the outset did not cause us a lot of problems in Engineering . However , it did achieve its objective . " 
