TC No. SR00513AT. Installed AERONAUTICAL ACCESSORIES, INC. HEADSET HANGER BRACKETS in accordance with STC No. SR00235AT. Installed BHT serviceable Lightweight Popout Floats in accordance with BHT-407-11-1. Installed BHT Drive Train Modification Kit, P/N 407.704-012-115 in accordance with BHT-407-II-30. Weighed aircraf