An aircraft attached apparatus/method for spraying pesticides having two propeller shafts attached to the aircraft. Each shaft has a full feathering propeller mounted at the forward ends of the propeller shaft and a control cable extending to the cockpit. High pressure pumps, typically piston pumps, are mounted on the aft ends of each of the propeller shafts. The input side of the pumps are connected to a tank, and the output side is connected to respective matrix spray boom assemblies. The forward ends of each of the spray boom assemblies are connected to the output side of each respective pump. Spray nozzles, typically impingement nozzles, are attached to each of the aft ends of each spray boom. The high pressure pumps have an electrically operated magnetic brake attached thereto, and each of the spray boom assemblies have a pressure transmitter connected to a digital display in said aircraft.