I wouldn't have thought so as long as you don't land immediately once the tide is out or on its way in.
I have landed there in a C172 and tommy and no probs but they have chunky tyres.
The sand is actually alot harder than you expect to be honest.
I suppose you could check what the numbers are for the twin otter and see how they compare to the mooney.
Last edited by mad_jock; 13th Jun 2012 at 14:36.