Home' RTCA Documents for Review : C2 Link Systems MASPS_Draft Contents 16
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Assumptions form an important basis for all assessments and analyses contained in this
document. All requirements must be considered within the context of the assumptions
made, as well as the operations and environments defined. For the implementation of the
C2 Link System, any deviation from the assumptions noted in this document could impact
the corresponding requirements, and therefore must be accounted for in supporting analysis
or introduction of other assumptions and/or mitigations.
Assumptions have been made at various stages of the development process of this
document. These assumptions include procedural and environmental assumptions.
A listing of major assumptions used in developing the requirements in this docu ment is
found in Section 3.3.
Existing controls identified in the OSA Hazard Analysis Worksheet (HAW) are only those
controls that currently exist and help to ensure an acceptable level of safety in the U.S.
airspace. Unlike existing controls, mitigations are recommendations or additional
requirements that, if implemented, will reduce the safety risk to an acceptable level. The
only mitigation proposed in this MASPS is the set of safety and security requirements
contained in Section 3.10. No other mitigations are proposed in this MASPS as it was the
opinion of the committee that these mitigations would prescribe design solutions that
would not necessarily be acceptable to all UAS operators and designers.
The various requirements on the C2 Link System were developed in the appendices and,
along with supportive topics are described below.
Operational Requirements (OR) were developed within the OSED. These include
procedures that must be followed in the operations defined for the C2 Link System to
be properly executed. Within the OSED (APPENDIX B), these Operational
Requirements are enumerated with the “OR#” tag.
Functional Requirements (FR) are also develpoped within the OSED (APPENDIX B).
These include functions that the C2 Link System needs to perform to satisfy the
Operational Requirements within the specified environments, and using the services
provided, to be properly executed. These Functional Requirements are enumerated
with the “FR#” tag.
Operational Hazards (OH) and Safety Objectives (SO) are identified within the OSA
(APPENDIX C). These describe the hazards associated with each of the top-level
functions (FRs) and are continued in the Hazard Assessment Worksheet (HAW) that
is part of the OSA. They are enumerated with OH-# and SO-# identifiers, where the #
is the Use Case from which they were derived and the specific OH and SO number.
The qualitative SOs are used along with a Risk Matrix to determine the quantitative
The Risk Matrix shown in APPENDIX D, Table D-1, is proposed as a means of
determining the appropriate quantitative risk for a UAS based on the kinetic energy of
the aircraft. This approach is consistent with the FAA’s risk-based certification
approach that governs regulations and policy established for traditional aviation
[reference “The FAA and Industry Guide to Product Certification” Third Edition, May
2017]. However, the use of Allowable Quantitative Probabilities below Risk Class 6
has not been agreed for cases where the C2 Link System is supporting DAA related
remote pilot activities.
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