(AED) of the U. S. Army Aviation and Missile Research, Development, and Engineering Center, is responsible for providing airworthiness releases for Army aviation systems,
to include an
aviation system composed of a UAS that employs GBSAA as a means to “see and avoid” other aircraft.
After the AED issues an airworthiness release, the FAA provides a Certificate of Authorization, based on the Army’s submitted release and an accompanying safety case, to allow the UAS using the GBSAA system to operate in the NAS.
Because the GBSAA system can- not interfere with the safety of the NAS, AED levies
certain software
development requirements on the development team. Along with other standards, the Army uses the guidance published by the private, not-for-profit RTCA Inc., in DO-178C, Software Considerations in Airborne Systems and
Equipment Certification, to establish soft- ware development requirements.
USAIC is using an independent desig- nated engineering representative (DER) to navigate the implications of DO-178C for the GBSAA system’s design. Te DO- 178C guidance influences many aspects of the design process: the structure of the system-level, subsystem-level, and software-level requirements; the overall architecture of the system; the processes employed during design, code writing, and testing; and the artifacts generated as a result of the design and test processes.
Te DER is a valuable resource who, while certified by the FAA, is not employed by the FAA. Rather, the DER serves as an independent reviewer and sounding board during system design, development, and test, ensuring that system design is executed in accordance with AED’s
requirements with an eye toward FAA expectations.
Phase 2 Block 0 will be the first GBSAA system to follow DO-178C Level B Design Assurance Level guidance. Prep- arations for fielding the system must occur
in parallel with system develop- ment and certification.
FIELDING THE SYSTEM Implementation of the GBSAA system is unique to each fielding location. Te USAIC team has to begin the fielding process at least two years before the sys- tem is approved for operation. One of the initial steps is to coordinate site vis- its through the major commands down to the installation’s Force Management Office. Determining the GBSAA opera- tional area requires an analysis of
the
fielding installation’s airspace, location of the UAS launch and recovery airfield, and UAS flight path and operational areas.
With the required operational area estab- lished, the sensor
engineer identifies general locations where the radar could
EYES ON THE SKY
The placement of radar, such as the one shown here, is a key question among many addressed in site preparations for fielding GBSAA systems. The total number of radar towers needed for GBSAA is site-dependent, taking into consideration factors such as terrain, total area, and airspace ceiling. This 3-D radar tower at Dugway Proving Ground, UT, has proven successful in controlling multiple manned and unmanned aircraft sharing common airspace. (U.S. Army photo)
ASC.ARMY.MIL
65
ACQUISITION
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