1.1 This specification covers the airworthiness requirements for the design of light unmanned aircraft systems. This specification defines the baseline design and construction requirements for an unmanned aircraft system (UAS).

1.2 As a minimum, a UAS is defined as a system composed of the unmanned aircraft and all required on-board subsystems, payload, control station, other required off-board subsystems, any required launch and recovery equipment, all required crew members, and command and control (C2) links between UA and the control station.

1.3 The intent is for this standard of practice for CAA, self- or third-party determinations of airworthiness for UAS. This specification provides the core requirements for airworthiness certification of lightweight (UAS) (not necessarily limited to UAs under 55 lb GTOW) or for certain CAA operational approvals using risk-based categories. Additional requirements are envisioned to address the requirements for expanded operations and characteristics not addressed by this specification.

1.4 This specification is intended to support UAS operations. It is assumed that the risk of UAS will vary based on concept of operations, environment, and other variables. The fact that there are no human beings onboard the UAS may reduce or eliminate some hazards and risks. However, at the discretion of the CAA, this specification may be applied to other UAS operations. This specification was originally designed to be a standalone standard, but, as revised in this version, it should be viewed in the context of the broader ASTM series of standards. The committee has streamlined the content, removing duplications to foster a cohesive and referential approach. This method underlines the importance of consulting and incorporating all relevant ASTM standards to ensure a comprehensive and accurate application of this specification, while recognizing that it represents one of several viable pathways to compliance.

1.5 When intending to utilize the information provided in this specification as a means of compliance for operational or design approval, or both, it is crucial to consult with the respective oversight authority (for example, CAA) regarding its application. To find out which oversight authorities have accepted this specification (in whole or in part) as an acceptable means of compliance to their regulatory requirements (hereinafter "the Rules"), please refer to the ASTM F38 webpage (www.ASTM.org/COMMITTEE/F38.htm).

1.6 The values in Imperial units are to be regarded as the standard. The values in SI are for information only.

1.7 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.

1.8 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.