1.1 This terminology standard covers definitions of terms and concepts related to unmanned aircraft systems (UAS). It is intended to encourage the consistent use of terminology throughout all ASTM unmanned aircraft system standards and is intended to complement F3060 Standard Terminology for Aircraft. Terms already included in Terminology F3060 are not duplicated here.

1.2 A definition adapted from a particular standard within the ASTM F38 collection of standards is not limited to use within only those standards.

1.3 Additional terms specific to a given standard may be defined solely within that standard and not included here.

1.4 Units—The definitions of units will be as defined in NIST SP 330, and will not be duplicated in this document. NIST SP 330 is available on the internet.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.

1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.