This aircraft started life a Beech E18S but later had the Hamilton Westwind nose fitted and was converted to PT-6 power. It was one of 5 similar conversions operated by K&K, which later became Dynamic Aviation, out of Los Alamitos on the Mediterranean Fruit Fly (Medfly) eradication programme. When the Beech 18 turbos were displaced by ex US Army U-21s this aircraft was sold to the Brazoria County Mosquito Control District of Angleton, Texas, for use as a mosquito control sprayer.

Ex N787S, N5681, N56S, N514JH, N514J, N514T, N33JD. Registered as an E18S but converted to Hamilton Westwind III in 1974.