An operator engaged in spraying and dusting operations shall operate in compliance with Attachment 20-1.An operator engaged in rotorcraft external-load operations shall operate in compliance with Attachment 20-2.An operator engaged in free balloon flight operations and free balloon tethered operations shall operate in compliance with Attachment 20-3.An operator using single-engine turbine-powered airplanes engaged in operations shall operate in compliance with Article 234, Article 249, Article 251, Article 271 and Attachment 20-4.An operator engaged in helicopter offshore operations shall operate in compliance with Attachment 20-5.ATTACHMENT 20-1 The Operations of Spraying and Dusting (Agriculture aircraft).pdfATTACHMENT 20-2 The Helicopter external-load operations.pdfATTACHMENT 20-3 Free balloon flight operations and tethered activities..pdfATTACHMENT 20-4 Additional Requirements for Approved Operations by Single-engine Turbine-powered Airplanes at Night and／or In Instrument Meteorological conditions（IMC）.odtATTACHMENT 20-5 The Helicopter Offshore Flight Operations.pdf