B76 Duchess spin testing
I was told today by a META instructor that the Duchess is one of the only light twins ever to have undergone asymmetric stall/spin testing. The Duchess POH I did the engineering exam on, however, said something similar to what a lot of other twins' POHs say: 'This aircraft is not approved for spins and no spin testing was conducted during certification. What follows is based on Beech's best judgement.'
Can someone enlighten me? I know the quoted passage relates to symmetrical thrust spins but it sort of stands to reason that if normal spins weren't investigated then asymmetric ones definitely wouldn't be, right? Maybe it was only investigated after a certain serial number? Anyway, any info would be very much appreciated.