Sunday, March 26, 2017

Attaining Airworthiness Certifications for Unmanned Aerial Systems from the Federal Aviation Administration (FAA)

Attaining Airworthiness Certifications for Unmanned Aerial Systems from the Federal Aviation Administration (FAA)

Note: Recently, I attended an airworthiness certification lecture with a friend of mine who is attaining an Aircraft Maintenance Professional (AMP) qualification, and the topics discussed got me thinking about the specific applications to what the FAA would think about UAV’s and the determination of “airworthiness.”

Generally speaking, when an aircraft is designed and proposed to be incorporated into commercial air systems or airspace, the FAA requires a certification be granted to that specific airframe to ensure appropriate safety standards and regulations have been embedded in the design (Federal Aviation Administration, 2016). Compliance with airworthiness directives (AD), FAA regulations and inspections are imperative in the safe operation of an aircraft, and 14 CFR 91.7 (Links to an external site.) specifically prohibits any person from operating an aircraft that is not in an airworthy condition (Aircraft Owners and Pilots Association, 2017).

Integration of the UAS into commercial aviation does not stop at just the design portion, but maintenance requirements as well. 14 CFR 91.407 emphasizes the operator’s additional responsibility by stating, "No person may operate an aircraft that has undergone maintenance, preventative maintenance, rebuilding, or alteration unless: (1) It has been approved for return to service by a person authorized under 43.7  (Links to an external site.)of this chapter; and (2) The maintenance record entry required by 43.9  (Links to an external site.)or 43.11  (Links to an external site.), as applicable, of this chapter has been made" (Seipel, 2013). Therefore, not only does the UAV need to be operated in conjunction with FAA directives for flight, but maintenance procedures and intervals in which maintenance is performed/documented as well. Technological advancements in sensory systems such as Sense-and-Avoid (SAA), and incorporation of NextGen capabilities such as Command, Control, and Communication (C3) will require specific maintenance upkeep and an unblemished documentation record indicating strict adherence to FAA policies if the UAV intends to be registered legally to fly in controlled airspace (Federal Aviation Administration, 2016). Adequate demonstrations of a UAV’s ability to safely work in an environment with manned aircraft, in all different types of operating conditions, will certainly be a task in order to incorporate these vehicles into the existing air network.
         
To specifically address how to attain 14 CFR 91.203 (a) and (b), the FAA explains in National Policy order 8130.34C the process of possession and display of an aircraft registration, airworthiness certificate and aircraft flight manual. The policy states that “because the aircraft is unmanned, the applicant must petition the FAA for relief from compliance with this requirement in accordance with 14 CFR part 11, General Rulemaking Procedures. If an exemption is granted, the aircraft registration, airworthiness certificate, and aircraft flight manual must be maintained at the location defined in the exemption” (Seipel, 2013). The National Policy further addresses the requirements for maintenance record entries, test data plans, documentation, and experimental certificate or special flight permits for unmanned aerial systems (Seipel, 2013). Successful completion of the appropriate requirements delineated and enforced from the FAA policies will result in legal integration of UAV’s into the national airspace system (NAS), so long as the operator abides by the rules and regulations set forth.
As a separate discussion point, one could assume that not only would the unmanned aerial vehicle (UAV) itself need to be built to conduct safe operations, but there may exist a potential future requirement for regulating the personnel operating the UAV (Aircraft Owners and Pilots Association, 2017). Military UAV operators are highly trained and skilled, and commercial/military pilots are required to be especially knowledgeable of FAA directives and flight rules, so why would personnel flying an FAA approved aircraft from the ground not be held to the same licensing or regulatory standard considering the potential interactions a UAV may face with manned aerial systems.

References:
Aircraft Owners and Pilots Association. (2017). Guide to Aircraft Airworthiness. Retrieved from https://www.aopa.org/go-fly/aircraft-and-ownership/maintenance-and-inspections/aircraft-airworthiness/guide-to-aircraft-airworthiness

Federal Aviation Administration.  (2016).  Unmanned Aircraft Systems (UAS) Frequently Asked Questions/Help [Fact Sheet].  Retrieved from https://www.faa.gov/uas/faqs/#krp

Federal Aviation Administration.  (2013).  Integration of Civil Unmanned Aircraft Systems (UAS) in the National Airspace System (NAS) Roadmap (FAA 2012-AJG-502).  Washington, DC: U.S. Government Printing Office.

Seipel, J. (2013, August 2). Order 8130.34C, Airworthiness Certification of Unmanned Aircraft Systems and Optionally Piloted Aircraft. Retrieved from U.S. Department of Transportation, Federal Aviation Administration, Production and Airworthiness Division, AIR-200, https://www.faa.gov/documentlibrary/media/order/8130.34c.pdf.

Northrop Grumman X-47B Unmanned Combat Aerial Vehicle (UCAV) as a Test and Evaluation Platform

The Northrop Grumman X-47B unmanned combat aerial vehicle (UCAV) is still in the primary testing stages but is currently used as a demonstration UCAV promoting operations aboard an aircraft carrier. The X-47 is currently being tested for missions including: aerial refueling, intelligence, surveillance, and reconnaissance (ISR) missions using a compliment of sensors (Northrop Grumman Corporation - Aerospace Systems, 2012). For the near future, the vehicle is currently only being used as a platform for follow-on evaluations by the U.S. Navy (USN) for UAV operational capabilities at sea, predominantly the in-flight refueling mission for manned aircraft (Holmes, 2015). In terms of autonomous operations, the vehicle is capable of performing takeoff and landing sequences successfully aboard a pitching and rolling aircraft carrier deck, as well as performing combat maneuvers with an F-18E aircraft (Northrop Grumman Corporation - Aerospace Systems, 2012).

When discussing the military applications of UAS, initially the MQ-9 Reaper, GlobalHawk, MQ-1C Grey Eagle, or MQ-1 Predator supporting the ISR and close air support (CAS) missions may come to mind. However, there are very few Navy applications of UAS currently serving the same tasks provided by the United States Air Force, especially when considering the operating conditions and maritime environments that the Navy would require a UAV. Additionally, generating an automated-task completion matrix or autonomous action library of which to draw conclusions and flight maneuvers based on sensory inputs to land on a moving ship would be extremely complicated (Dillow, 2013). Use of multiple sensor types such as synthetic aperture RADAR (SAR), inverted synthetic aperture RADAR (ISAR), electro-optical (EO) and infrared sensors, and electronic support measures (ESM) allow for a multitude of mission areas available to the X-47 (Holmes, 2015). The margin for error is low and the risks considering the flight deck size, location and introduction of uncalculated variables for such a system design are high. Continuous experimentation and exposure of UAV’s such as the X-47B to the ever-changing maritime environment and complex interactions between manned/unmanned aircraft is crucial for future improvements and mainstream design leading to production (Dillow, 2013).

Moreover, providing an appropriate level of human interfaces to allow for maximum controllability and situational awareness will be key in terms of adaptability/flexibility for this UAV when changing operating environments and external influences by which to react. Having a platform that provides insight into these development characteristics, and has the inherent mission of adapting to different environmental conditions and operational demands makes for a very unique unmanned system available to all services.

There are similar designs in terms of research-driven platforms that are intended for commercial use to perform UAV test and evaluation (T&E), one such design is the modified commercial BirdsEyeView Aerobotics FireFLY6 vertical-takeoff-and-landing (VTOL) UAV called “Elissa” (Norris, 2016). This research UAV is a joint effort by NASA and the Airforce Research Laboratory (AFRL), and is meant to test and evaluate the variables associated with plans to develop an aircraft labeled “Traveler”; this aircraft is designed to plan, launch, navigate and refuel itself autonomously (Norris, 2016). Currently, “Elissa” is testing the capability of the auto-air collision avoidance system (AUTOCAS) in order to safely deconflict with other aircraft should RADAR follow-on and controllers fail to prevent a potential mid-air collision (Norris, 2016). It is the objective of this post to highlight the importance of dedicated UAV T&E platforms, and how they are crucial for the future success of UAV platforms for both commercial and military missions.

References:
Dillow, C. (2013, July 5). What The X-47B Reveals About the Future Of Autonomous Flight. Popular Science Magazine Online, Retrieved from http://www.popsci.com/technology/article/2013-05/five-things-you-need-know-about-x-47b-and-coming-era-autonomous-flight

Holmes, J. (2015, May 6). The Mighty X-47B: Is It Really Time for Retirement? The National Interest Magazine Online, Retrieved from http://nationalinterest.org/feature/the-mighty-x-47b-it-really-time-retirement-12818.

Norris, G. (2016, March 28). NASA’s Traveler to Demo ‘Trustworthy’ UAS Autonomy. Aviation & Space Technology NewsWeek. Retrieved from http://aviationweek.com/commercial-aviation/nasa-s-traveler-demo-trustworthy-uas-autonomy.

Northrop Grumman Corporation - Aerospace Systems. (2012). X-47B Navy UCAS - Unmanned Combat Air System. Retrieved from Northrop Grumman Corporation, https://web.archive.org/web/20100331204427/http://www.as.northropgrumman.com/products/nucasx47b/assets/UCAS-D_DataSheet_final.pdf

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