Issued in March 2016. This standard provides the operational, safety, and performance requirements (SPR) for the implementation of data communication services that support air traffic services (ATS). It is intended to support the communication element of the implementation of communication, navigation, and surveillance / air traffic management (CNS/ATM) systems in worldwide application. Data link communications are expected to be used for routine or frequent types of transactions. Data link communications are expected to be used for communication functions in which the use of voice communication is considered inefficient or unnecessary, thereby reducing voice-channel use and, where resulting controller workload reduction allows increases in sector size, reduction in the number of required voice channels.