Description UPDATE TSB: A08A0059: The Cougar Helicopters Sikorsky-S92A , operating as CHI91, was in cruise flight en route from the Hibernia Gravity Based Platform to St. John's Intl. When the helicopter was approximately 100 NM SE of St. John's, NL the crew contacted Gander ACC to advise they were declaring an emergency and had shutdown engine #1 (GE CT7-8A). The engine shutdown was required due to a Gear Box chip light. The helicopter landed uneventfully at 12:35 NDT while ARFF were standing by. Maintenance determined the chip light was due to an accumulation of "nuisance fuzz" in the form of a "sliver" on a recently installed Main Gearbox accessory input.