ASTM F2689 Standard Practice for Design and Manufacture of Reciprocating Spark Ignition Engines for Unmanned Aircraft Systems
ASTM F2689  往復式火花點火發動機的設計和制造無人駕駛飛機系統的標準守則
This practice provides designers and manufacturers of engines for unmanned aircraft systems design requirements and criteria to use in designing and manufacturing engines.
Declaration of compliance is based on testing and documentation during the design and testing or flight testing of the engine type by the manufacturer or under the manufacturers' guidance.
Compliance with this specification is intended to demonstrate an adequate level of reliability in accordance with the UAS safety objectives.
1. Scope
1.1 This practice covers minimum requirements for the design and manufacture of reciprocating spark ignition engines for unmanned aircraft systems.
1.2 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 and health practices and determine the applicability of regulatory limitations prior to use.

2. Referenced Documents (purchase separately)
RTCA Standard
RTCADO-178B Software Considerations in Airborne Systems and Equipment Certification
Index Terms
powerplant; propulsion; reciprocating spark ignition engine; unmanned aircraft systems;