I'm sure SAS will remember when Bristow removed the bifilars from their S8Ts in Teeside to reduce weight so they could operate with a payload/range combination for which the 58 was never really designed. I forget the crew now who were IMC and picked up a lot of icing on the jacks, but think that at one stage they may have looped! They recovered when they broke cloud at just under 1,000 feet with an extreme nose down attitude. I believe a couple of the pitch change rods were actually found to be deformed after they landed. Maybe someone who was there at the time will recall the exact details?
Air America leased 6 S58Ts in Laos, but 3 were listed as downed in 1973 and the remaining 3 scrapped in 1974. The Thai Am company modified 18 Sikorsky S34 Choctaws to S58Ts for the Royal Thai Air Force from 1978:
