Home' RTCA Documents for Review : C2 Link Systems MASPS_Draft Contents Appendix D
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APPENDIX D OPERATIONAL PERFORMANCE ASSESSMENT
This Appendix describes the Operational Performance Assessment (OPA) that was used to
determine the values for the various normative performance requirements associated with
the C2 Link System that are contained in Section 3.8 of this Minimum Aviation System
Performance Standards (MASPS).
These performance requirements are very similar in concept to those described in DO-264
 and other RTCA MASPS but here they are focused on the concept of Required Link
Performance (RLP) where the word Link in RLP refers to the overall performance of the
combined links and networks in the C2 Link System (see Figure 1-3). RLP has a very
similar meaning to the term Required Communication Performance (RCP) that is used in
DO-264  and other RTCA MASPS, i.e., it is the performance that the C2 Link System
is Required to achieve to support safe, secure, efficient (the three ORs under OR-4 that
drive the performance requirements in this MASPS) Unmanned Aircraft (UA) operations
as described in the Concept of Operations (CONOPS) (APPENDIX A) and in the
environments described in the Operational Services and Environmental Descriptions
(OSED) (APPENDIX B) in this MASPS.
This C2 Link System MASPS OPA is primarily focused on evaluating the technical (i.e.,
non-human) part of the RLP, which is herein defined as the Required Link Technical
Performance (RLTP). The RLTP is the performance required of the C2 Link System when
it is performing key aspects of its three top-level functions, FR-1, FR-2 and FR-3 (see
These key aspects enable the remote pilot to perform the operational activities captured in
the C2 Link Systems Operational Requirements (ORs) described in B.8.1. These ORs
Aviating the UA using the Flight Guidance System (FGS) (OR-1.1),
Communicating with other pilots or Air Traffic Control (ATC) (OR-1.2, 2.1 and
Navigating the UA using the Flight Management System (FMS) (OR-1.3 and 2.4),
Integrating the UA into the National Airspace System (NAS) with other airspace
users (OR-1.4 and 2.3) and
Managing the C2 Link System itself (OR-1.5). Which includes:
Status reporting aspects of the C2 Link System’s performance (FR-3.1).
Switchover aspects of the C2 Link System (FR-2).
These ORs and their supporting Functional Requirements (FRs) were used as the
framework for this OPA and in the assessment of values of the performance requirements
that were deemed necessary to support each of the FRs that enable the remote pilot to
accomplish the ORs.
Again, in a similar manner to DO-264  and other RTCA MASPS, the concept of a
transaction was used to investigate the time-related aspects of the required performance.
However, in the case of this MASPS, the transactions were not just two-way voice or data
related (as in the case of DO-264) but also included such one-way activities as uploading
a flight plan to the UA Flight Management System (FMS) or downloading to the Control
Station (CS) the tracks from the Detect and Avoid (DAA) system onboard the UA.
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