sentences:  The prototype was flown first on 8 March 1932  and crashed in June 1933 following an engine failure.Because it had been ordered by the Air Ministry, this machine carried an RAF serial ("S1640") and was known throughout its life as the M.1/30, after the Specification.Following relaxation of some of the specifications requirements, Blackburn constructed a second aircraft as a private venture, with a watertight metal monocoque fuselage replacing the previous steel tube fuselage, this first flying on 24 February 1933.