Airports and Unmanned Aircraft Systems, Volume 2: Incorporating UAS into Airport Infrastructure— Planning Guidebook (2020)

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3 This chapter provides fundamental UAS terminology to facilitate use of this guidebook. One important distinction is the difference between the terms “UAS” and “unmanned aircraft.” The term UAS collectively refers to an unmanned aircraft, the associated control system, and the system for communicating between the two (NASEM, 2018). The unmanned aircraft, “. . . an aircraft that is operated without the possibility of direct human intervention from within or on the aircraft” (FAA, 2018a) is a component of a UAS. Thus, in this guide- book, unmanned aircraft is used when discussing the actual aircraft and UAS is used when referring to the entire system. Also, UAS, in this guidebook, refers to UAS operated by a remote pilot as opposed to a fully autonomous UAS. Few definitive definitions of UAS types or classifications exist. Some are defined by law but even those definitions can change over time. Additionally, different countries may use different terminology. The FAA Reauthorization Act of 2018 includes definitions of the following types of UAS: • Small Unmanned Aircraft. “The term ‘small unmanned aircraft’ means an unmanned aircraft weighing less than 55 pounds, including the weight of anything attached to or carried by the aircraft.” • Actively Tethered Unmanned Aircraft System. “The term ‘actively tethered unmanned aircraft system’ means an unmanned aircraft system in which the unmanned aircraft component— (A) weighs 4.4 pounds or less, including payload but not including the tether; (B) is physically attached to a ground station with a taut, appropriately load-rated tether that provides continuous power to the unmanned aircraft and is unlikely to be separated from the unmanned aircraft; and (C) is controlled and retrieved by such ground station through physical manipulation of the tether.” The FAA Modernization and Reform Act of 2012 also defined a model aircraft as “. . . an unmanned aircraft that is (1) capable of sustained flight in the atmosphere; (2) flown within visual line of sight of the person operating the aircraft; and (3) flown for hobby or recreational purposes.” (FAA, 2012a) However, the FAA Reauthorization Act of 2018 repealed this definition (FAA, 2018a). Regardless, the term model aircraft, also referred to as hobby or toy UAS, is still used in the industry. Also, in this guidebook, the term ‘non-model UAS’ refers to those unmanned air- craft that are not flown for hobby or recreational purposes. C H A P T E R 2 UAS Terminology and Classifications

4 Airports and Unmanned Aircraft Systems ICAO uses the term “remotely piloted aircraft (RPA)” which means “an aircraft where the flying pilot is not on board the aircraft” (ICAO, 2011). According to ICAO, RPA is a sub - category of UAS. The other subcategory is an autonomous aircraft; “an unmanned aircraft that does not allow pilot intervention in the management of the flight” (ICAO, 2011). UAS are also classified by size, speed, or mission but these classifications are not uniform across the industry. For industry forecasting purposes, UAS are classified by mission or use such as military, commercial, or civil. These classifications also vary within the industry. Some UAS fore- casts consider commercial activity a subset of civil activity, while others classify civil as only government activity. In some cases, civil includes research, training, and educational UAS activity.