6 7 6   km ) ▁at ▁a ▁cru ising ▁speed ▁of ▁ 1 3 0   m ph ▁( 2 1 0   km / h ). ▁By ▁August ▁ 1 9 3 3 , ▁Roy ▁Ch ad wick ' s ▁team ▁had ▁produced ▁a ▁design ▁study . ▁This ▁had ▁to ▁be ▁re vised ▁when ▁Imperial ▁Air ways ▁changed ▁the ▁specification , ▁to ▁enable ▁the ▁machine ▁to ▁fly ▁the ▁Kar achi - B omb ay - Col om bo ▁night ▁mail ▁service . ▁The ▁am ended ▁design ▁was ▁accepted , ▁and ▁in ▁April ▁ 1 9 3 4 ▁an ▁order ▁for ▁two ▁aircraft ▁was ▁issued . ▁The ▁first ▁aircraft ▁fle w ▁on ▁ 7 ▁January ▁ 1 9 3 5 , ▁and ▁the ▁type ▁was ▁certific ated ▁in ▁March ▁ 1 9 3 5 . ▁ ▁Oper ational ▁history ▁On ▁ 1 1 ▁March ▁ 1 9 3 5 , ▁the ▁two ▁Av ro ▁ 6 5 2 s ▁were ▁delivered ▁to ▁Imperial ▁Air ways ▁at ▁Cro yd on ▁Airport . ▁They ▁served ▁with ▁Imperial ▁Air ways , ▁mostly ▁operating ▁the ▁route ▁from ▁Cro yd on ▁to ▁Br ind isi . ▁In ▁ 1 9 3 8 , ▁they ▁were ▁sold ▁to ▁Air ▁Service ▁Training ▁Ltd , ▁a ▁civil ian ▁company ▁operating ▁under ▁Air ▁Ministry ▁contract s . ▁They ▁served ▁with ▁No . 3 ▁E & R FT S ▁( Element ary ▁and ▁Reserve ▁F lying ▁Training ▁School ) ▁as ▁navig ational ▁train ers , ▁at ▁Ham ble ▁air field . ▁In