New IEEE Standard - Active - Draft. Interface and functional specifications of cellular communication terminals installed on unmanned aerial vehicle (UAV) are presented in this recommended practice. The specifications are described in four categories: the terminals’ interface and functional specifications, specifications of data transmission, environmental and reliability specifications, and safety practice. The terminals’ functional specifications include the power management, cellular network communication, flight data and payload data collection, procession and transmission, device management, and safety management. The terminals’ interface specifications are the specifications of the electrical interface and electromechanical interface. The electrical interface refers to the power supply interface, communication interface, human-machine interface, and antenna interface. Data transmission are the flight data and payload data transmission protocols and terminals’ payload data safety practice. Finally, the terminals’ interface environmental, reliability and electromagnetic compatibility are presented.