Cowan was in the 54 OTU Defiant, I see that the ORB records a slightly different serial for an aircraft that was written off in October 1940.
May 17th 1941, “There was a fatal accident, involving Defiant aircraft No.N1578. The pilot
No.990448 Sgt V.M. Russell went into the ground at speed when taking off. This was during
night flying practice, at 0350 hrs; and it is presumed he failed to use his instruments. The pilot was slightly injured, but his Air Gunner, No.535102 Sgt R. Cowan, was killed. The aircraft was burnt out. There was a second accident during night flying; Blenheim No.L1302, piloted by P/O M.W. Kinmouth, overshot during its approach after both engines had failed owing to the pilot making wrong use of his cold air system which caused the carburettor to ice up. The aircraft was written off, but the pilot uninjured.”
I don't have anything about the others.
Alan Clark
Peak District Air Accident Research
http://www.peakdistrictaircrashes.co.uk/
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