Home' RTCA Documents for Review : C2 Link Systems MASPS_Draft Contents 1
© 2018 RTCA, Inc.
Purpose and Scope
This document contains the Minimum Aviation System Performance Standards (MASPS)
for a C21 Link System connecting a Control Station (CS) and an Unmanned Aircraft (UA).
It covers UA operations requiring a C2 Link System3 that allows the UA to operate within
line of sight (LOS) and beyond the line-of-sight (BLOS) of a CS. The types of information
that are exchanged over the C2 Link System include both:
1. The commands from the remote pilot,
i.e., the telecommands sent over a forward link
from the CS to the UA, and
2. The status and annunciations from a UA, i.e., the telemetry data sent over a reverse
link from the UA to the CS, that are associated with all of the activities the remote pilot
is required to perform to safely execute the flight plan. These safety-of-flight5 related
information exchanges do not include normal payload information, i.e., the
information associated with the UA mission payloads.
A more complete description of those information exchanges and the associated
requirements on the C2 Link System are given within this MASPS.
Introduction and Purpose of Document
Subsection 1.1 contains a discussion of why and how this document was prepared and how
it should be used.
RTCA has supported the Federal Aviation Administration (FAA) for several years in
developing the MASPS and Minimum Operational Performance Standards (MOPS)
needed to support UA flights within the U.S. airspace6 and beyond the operational limits7
placed on small unmanned aircraft systems (UAS).8 From 2006-2012 the RTCA Special
Committee (SC)-203 sought to develop a UAS MASPS document; although it was not
completed, there was sufficient progress to provide much-needed groundwork. In 2013
the RTCA initiated SC-228 with a narrower scope; namely, to develop MOPS needed for
(a) a UAS Detect and Avoid (DAA) system (the focus of SC-228 Working Group (WG)-
1 Note: When the term “C2” is used as part of the name of a system, i.e., C2 Link System, the term “C2” is used as a
noun and not as an abbreviation of the words “command and control”. Where it is used not as part of a name, then
it would be an abbreviation for command and control.
2 An Unmanned Aircraft (UA) is the physical aircraft that a remote pilot is operating.
3 A C2 Link System is the logical connection used for the exchange of information between a CS and an UA, to
enable the remote pilot to safely operate the UA in the authorized U.S. airspace.
4 A remote pilot is the person who is operating an aircraft but is not physically on that aircraft. Within this
document, this term is used instead of Pilot in Command (PIC) since PIC represents a legal responsibility not
necessarily the pilot operating the aircraft.
5 Safety-of-flight information is any information/data sent to or received from the UA that is necessary to ensure the
UAS is operated/operating in a manner that protects people and/or property from harm due to unintentional events.
6 U.S. airspace does not include Oceanic Airspace.
7 The limits placed on small UAS are described in the June 29, 2016 Federal Register (Volume 81, No. 124/Rules
and Regulations) which announces the amending of regulations to allow for the operation of small unmanned
aircraft systems in the National Airspace System (NAS). This added a new Part 107 to Title 14 of the Code of
Federal Regulations (14 CFR).
8 Unmanned Aircraft System (UAS) means all of the components that are directly involved as a UA is being
operated. In this document, this term is used instead of Remotely Piloted Ai rcraft System to leave open the
possible use of the abbreviation UAS to include autonomous aircraft. This definition is also used by the
International Civil Aviation Organization (ICAO).
Links Archive DO-XYZ_ED-ABC_FRAC_SC236_MASPS Navigation Previous Page Next Page