This report discusses the sinking of the amphibious passenger vehicle, Miss Majestic, during an excursion tour of Lake Hamilton near Hot Springs, Arkansas, on May 1, 1999. The NTSB's investigation of this accident identified safety issues in the following areas: vehicle maintenance, Coast Guard inspections of the Miss Majestic, Coast Guard inspection guidance, reserve buoyancy, and survivability. The Safety Board's recommendations to the U.S. Coast Guard and the Governors of the States of New York and Wisconsin are included.