Pilot Report
The helicopter was loaded near its maximum gross weight limit of 4150 lbs. The pilot reported that during an approach to an offshore platform in the Gulf of Mexico, there was virtually no wind. As the approach speed dropped below effective translational lift, the pilot noted a shudder that did not seem normal, so he initiated a go-around.
Accident Sequence
As the pilot applied power and pedal to go around, the aircraft spun to the right and the nose tucked. The pilot tried to correct the situation but was unable. He reported that just before water impact, he leveled the helicopter, deployed the emergency floats, and applied full collective pitch. He also stated that the rate of spin decreased as he applied collective pitch. One of the left floats separated on water entry, and the helicopter rolled over. No feedback or restriction of the controls was noted before impact.
Post-Accident Examination
A post-accident examination of the helicopter did not reveal any preimpact part failure or malfunction.