Home' RTCA Documents for Review : C2 Link Systems MASPS_Draft Contents 14
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The development of the CONOPS and scenarios included the assessment of (a) the various
UAS stakeholders and their goals and constraints, (b) life-cycle aspects of a UAS that
would impact a C2 Link System, and (c) other UAS and external systems that could impact
the C2 Link System. Based on those factors, five CONOPS were defined that addressed
all of the stakeholders’ goals, the life cycle aspects, and the other system constraints. For
this MASPS, two of the CONOPS were selected for more detailed study and one scenario
from each CONOPS was developed for detailed performance and safety assessment in the
OSA and OPA. These CONOPS and scenarios were chosen because they were considered
to be of immediate importance to the UAS industry. The remaining CONOPS will be
addressed in future versions of this MASPS.
Operational Services and Environment Definition (OSED) and Use Cases
The OSED effort included the development of critical operational and system views based
on the two selected CONOPS and the associated scenarios. Within each of those scenarios,
multiple use cases were assessed in greater detail, those being situations that would be most
demanding on the C2 Link System as it supports information exchanges to/from the CS
and UA. Those included critical times to support the DAA and communication systems so
as to maintain well clear between the UA and a target aircraft, to update the route of flight
within the UA’s navigation system, and to change (switchover) the C2 Link System
connection to/from terrestrial and satellite links. For those situations, the process led to the
development of an information exchange matrix which describes what the C2 Link System
needed to do to support the remote pilot’s actions and the related information exchanges
so a UAS could accomplish the defined scenario objectives. That information transfer
matrix was the basis for the detailed OSA and OPA.
Operational Safety Assessment (OSA)
An operational safety assessment was conducted to examine the safety risk associated with
the use of the C2 Link System between the remote pilot and the UA as defined in the OSED.
This safety analysis followed standard safety practices and guidance as defined in the
FAA’s Air Traffic Organization Safety Management System Manual . The scope of the
safety analysis is limited to the Linear Sensing and Aerial Survey CONOPS and their
associated scenarios as described in the OSED. To ensure potential hazards were identified
for all phases of flight within each scenario, all information exchange activities defined in
the information exchange matrix were assessed. These activities included the UA
operating in all classes of airspace (except Class A and Class E above Class A). The OSA
did not address UAS operating under visual flight rules (VFR). In addition, the OSA
assessment was not conducted on a specific design of the C2 Link System and did not
consider human factors in the analysis.
A Safety Risk Management Panel (SRMP) was formed to perform the analysis of the safety
risk in the above-described environments. The panel included representatives from the key
stakeholders identified in the OSED.
Operational Security Analysis
The C2 Link System MASPS uses the results of an Operational Security Risk Analysis that
was conducted by the FAA. The FAA, based on that analysis, determined that mitigations
were required to maintain an appropriate level of safety risk for integrating UAS into the
airspace. Based on that risk assessment, the FAA developed a set of security requirements
that were adopted by RTCA SC-228 and published in DO-362. Those requirements are
included in APPENDIX F and they apply equally to all types of C2 Link Systems. Thus,
those requirements apply to the types of C2 Link Systems within the scope of this MASPS
and are described in Section 3.
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