Minimum Aviation System Performance Standards for Aircraft ...

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Figure 3.1.2.1: Scope of ASA System MOPS
[Update with latest version, make sure to add the appropriate dashed line]
Note: Detailed ASSAP and CDTI performance and subsystem requirements are
addressed in the ASA System MOPS, the latest version of DO-317( ).
ASSAP receives surveillance inputs from the ADS-B / ADS-R / TIS-B Receive
Subsystem in the form of ADS-B and TIS-B reports. ASSAP may also receive
surveillance inputs from installed TCAS systems. The ASSAP subsystem is integral to
ASA application processing, providing surveillance processing on all available
surveillance reports, and providing the application-specific processing associated with all
ASA applications.
While ASSAP provides all application-specific processing for ASA, it also maintains the
interfaces to and from the CDTI. It is due to the close association of the ASSAP and the
CDTI, and their shared interface, that the ASSAP and CDTI MOPS was developed as a
single requirements document. The two sub-systems, ASSAP and CDTI, constitute the
“Aircraft Surveillance Application Systems“ and the Minimum Operational Performance
Standards document for this system is termed the “ASA System MOPS” the latest version
of DO-317( ).
As shown in Figure 3.1.2.1, the CDTI subsystem also serves as the ASA interface to the
flight crew.
3.1.3 CDTI Subsystem Description
The CDTI subsystem includes the actual display media and the necessary controls to
interface with the flight crew. Thus the CDTI consists of all displays and controls
necessary to support the applications. The controls may be a dedicated CDTI control