 An Avro report made public in 2015 clarifies that during the highest speed flight, the Arrow reached Mach 1.90 in steady level flight, and an indicated Mach number of 1.95 was recorded in a dive.Estimates up to Mach 1.98 likely originated from an attempt to compensate for lag error, which was expected in diving flight.Although no major problems were encountered during the initial testing phase, some minor issues with the landing gear and flight control system had to be rectified.