WAC 16-230-670. Use restricted herbicides — Eastern Washington — Aircraft boom length and application requirements

In all counties restricted by rule the working boom length on fixed wing aircraft shall not exceed 3/4 of the wing span and the working boom length on helicopters shall not exceed 6/7 of the total rotor length or 3/4 of the total rotor length where the rotor length exceeds forty feet. Aerial applications of use restricted herbicides shall conform to a combination of nozzles, pressure (psi), plates, nozzle orientation, and aircraft speed that produces a spray droplet class that falls within the coarse (or larger) range as defined by the ASABE standards. Upon request by the department the applicator shall provide all data which supports the nozzle configuration is compliant with spray droplet classifications of coarse (or larger).