Interesting point Beags is that the May 2 53 Calcutta ALYV accident findings fundamentally were that the aircraft was over stressed in severe turbulence.
However it was the retrospective personal opinion of an AIB Investigator ( TR Nelson)involved in all three , i.e ALYV, ALYP Elba Jan 10 54 and ALYY Naples Apr 8 54, that the basic cause was probably the same.