Were the Ti to fill with water at sea...

would the amas support it and prevent complete sinking?

High density polyethylene is slightly less dense than water, so a hull completely filled with water, without any fittings or passengers or extras would actually float on its own.
Roadrunner has quoted the buoyancy of the TI's amas at 2 x 220 = 440 pounds in total.
So, as long as the weight of the passengers, metal fittings, mast and sail and any extra gear on board came to less than 440 pounds, the answer is yes, it would keep floating.
There have been a few instances reported on the forum of people thinking their AI was sailing sluggishly, only to discover the hull almost full of water when they landed.

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Very many thanks indeed.

Apparently all 2011 model TI came with additional foam inside the hull to meet new US standards to prevent it sinking.

I've checked inside my hull and have found these foam located all over the hull.

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H@mmer
"Intelligence is nothing without imagination"