Home' RTCA Documents for Review : C2 Link Systems MASPS_Draft Contents Appendix B
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Use Case 5 – Terrestrial → SATCOM
As the UA nears the edge of Class E airspace, the controller informs the remote pilot that
radar services with the UA will be terminated. The remote pilot acknowledges the
controller’s instructions. The remote pilot then sends the command to the UA to
switchover the C2 Link from the terrestrial link to the SATCOM link. The C2 Link
Management function hands over the C2 Link to the SATCOM terminal. The remote pilot
verifies control of the UA over the new link.
Use Case 6 – DAA SATCOM
The UA is operating at 1000’ AGL in Class G when a manned VFR aircraft is detected by
the DAA system. The DAA system calculates the rotorcraft will intersect the course of the
UA and a well clear condition will be lost. The system issues a warning alert to the remote
pilot that a maneuver is required to remain well clear. The remote pilot evaluates the
situation and determines a maneuver is required. The remote pilot commands the UA into
low rate turn to the left of the filed flight plan (see yellow arrow by Use Case 6 within
As the UA completes the low rate circling turn, the remote pilot determines from the DAA
system that the rotorcraft is no longer in conflict with the planned route of flight. The
remote pilot sends the commands to the FGS to couple to the flight management system to
resume the route prior to where the UA left the approved route.
Use Case 7 – Landing/Post Flight
As the UA nears the end of its flight, the remote pilot establishes a telephone connection
with the ground crew at the landing site. The ground crew confirms to the remote pilot that
the airspace is clear of conflicts. The remote pilot notifies the ground crew of the ETA of
the UA and monitors the UA FGS as it transitions from horizontal flight, descends and
transitions to a hover (Note, the UA is still using the SATCOM Link). The remote pilot
contacts the ground crew and confirms the landing area is clear of personnel and
obstructions. The remote pilot commands the UA to land and upon confirmation, powers
down the quadrotors. The ground crew downloads the data from the UA (not through C2
Link) and conducts post-flight procedures on the UA. When the ground crew completes
post-flight procedures, the remote pilot is notified, and the UA is totally powered down by
the remote pilot.
Area Surveillance CONOPS, Media, and Incident Reporting Scenario
There are multiple potential scenarios within the Aerial Surveillance CONOPS (see
APPENDIX A.3), one was determined to contain many challenging operational and
demanding situations to the C2 Link System: the Media and Incident Reporting scenario.
Many of the major metro areas in the U.S. have news and traffic monitoring helicopters
that operate to show live video of traffic problems or other newsworthy events. These
helicopters are very expensive to operate and can only be operated by large, well -funded
TV and radio stations. If an unmanned rotorcraft could be operated at signific antly lower
cost than a manned aircraft, many more media outlets in smaller markets would use them
to provide the same service as manned aircraft provide in the larger markets. This scenario
assumes the existence of a certificated rotorcraft UAS that is operating in a major
metropolitan area. The use cases available in this scenario allow the assessment of UAS
flight crew tasks not deeply explored in the Power Line Inspection Scenario. These use
cases will help determine the minimum requirements for the C2 Link System.
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