scope:

This document contains the recommended requirements for the processing and display of traffic Ownship information for use by the flight crew in processing airborne applications. The document considers functional requirements consisting of Airborne Surveillance and Separation Assurance Processing (ASSAP) and Cockpit Display of Traffic Information (CDTI) as described in DO-289, Minimum Aviation System Performance Standards (MASPS) for Aircraft Surveillance Applications (ASA). It includes requirements to support the initial five applications included in DO-289, Enhanced Visual Acquisition (EVAcq), Conflict Detection (CD), Airport Surface Situational Awareness (ASSA), Final Approach and Runway Occupancy Awareness (FAROA) and Enhanced Visual Approach (EVApp). Operational performance standards for functions or components that exceed the stated minimum requirements are identified as optional features.

In order to provide more complete traffic situational awareness, the Traffic Alert and Collision Avoidance System (TCAS) display should be integrated with the CDTI on aircraft equipped with TCAS. This document provides requirements and guidance for integration of TCAS with ASAS.

DO-317A incorporates the following "prime" differences from DO-317:

- Incorporation of Airborne Surveillance Application requirements for the situational awareness applications ATSA-AIRB (ED-164/DO-319), ATSA-SURF (ED-165/DO-322), ATSA-VSA (ED-160/DO-314) and ATSA-ITP (ED-159/DO-312), jointly developed and published by EUROCAE WG-51 and RTCA SC-186 within the framework of the ADS-B Requirements Focus Group (RFG). This includes the related ADS-B data quality requirements for traffic and Ownship (including relevant qualification schemes thereof) and ASA system latency requirements.

- Harmonization of application transition requirements, in particular between the surface application and the airborne applications.

- Use of the 1090 MHz Extended Squitter MOPS (ED-102A/DO-260B) as the ADS-B data transmission and receipt baseline, in line with the European and US airspace regulations with respect to ADS-B Out.

- Refinement of expected regulatory ASA system design assurance requirements and the related definition of equipment classes.

- Integration of relevant VDL Mode 4 provisions.

- Maintenance of the RTCA-defined EVAcq application as the only application originally contained in DO-317, defining the minimum set of requirements ASA systems must meet for a minimum stand-alone traffic situation awareness application in smaller aircraft.

- Provision of additional updates, including:

• Traffic display prioritization;

• Support of TIS-B and ADS-R services (as defined by FAA);

• Data age requirements;

• Test scenarios and procedures