GKaplan said
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Even if you're too fast and/or you forget to arm, this kind of system does work.
It did a good job with Bond's 225 (aircraft flown into the water with landing gear down and floats not inflated -> next thing you know it's floating...thanks AFDS)
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The aircraft I've flown with AFDS systems operated only when the floats were ARMED. The concept was to provide automatic flotation if the aircraft belly sensors were exposed to salt water and the pilot(s) did not push the float deployment button then the floats would be deployed.
When the floats were unarmed nothing would happen.
bb