Comp Stall
From memory (and it has been a while) the ginger beers that looked after our piston fleet set the gear horn at 18" MP. Not sure if that was the manufacturers recommendation or one that they used in light of the fact that any piston twin driver worth his salt will not be using less than 15" MP until the flare. Seems bloody pointless having it set to 11" MP. If I was you mate I'd be looking into that and getting something done about it. Given, when the flaps are selected past half it should also sound but what if there is a problem with that switch and nothing happens.
Good thread this one..........somewhat refreshing
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Onya