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Design Concepts to Meet EASA SC-VTOL-01 Single Failure Criteria

Patarick R. Darmstadt, Sheevangi Pathak, The Boeing Company
Timothy Krantz, Mark Valco, NASA Glenn Research Center

May 10, 2022

https://doi.org/10.4050/F-0078-2022-17608

Abstract:
The objective of the current work is to discuss European Union Aviation Safety Agency (EASA) SC-VTOL-01 single failure criteria, VTOL.2250(c). VTOL.2250(c) increases safety metrics compared to existing Vertical Takeoff and Landing (VTOL) regulations, creating new engineering challenges that must be addressed. Additionally, research and development targeting compliance against VTOL.2250(c) will more broadly benefit the VTOL industry, providing guidance for safer system designs. Prior studies have developed concept distributed propulsion and flight control (DPFC) system architectures and found they comply with EASA SC-VTOL-01 probabilistic failure criteria, VTOL.2510(a). Prior work developed two all-electric DPFC systems utilized in a quadrotor concept aircraft developed by the National Aeronautics and Space Administration (NASA); one uses interconnecting shafts and gearboxes to interconnect redundant motors with each rotor system and the other uses gearboxes to connect redundant motors locally, near each rotor. Common between the two electric DPFC systems were rotor shafts, epicyclic systems, and motors. The current work explores Category I failures in drive systems, relevant research to support fail-safe design practices for gear systems, research and adjacent industry trends in motor fail-safety and reliability, and proposed design concepts to comply with VTOL.2250(c). Continued research in fail-safe design concepts and design guidance will benefit eVTOL and conventional rotorcraft, alike. Continued research in these areas will benefit eVTOL certification against SC-VTOL-01, and could optimistically translate to more widespread adoption of similar fail-safe design concepts into new rotorcraft designs certified against CS-29.


Design Concepts to Meet EASA SC-VTOL-01 Single Failure Criteria

  • Presented at Forum 78
  • 15 pages
  • SKU # : F-0078-2022-17608
  • Propulsion II

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Design Concepts to Meet EASA SC-VTOL-01 Single Failure Criteria

Authors / Details:
Patarick R. Darmstadt, Sheevangi Pathak, The Boeing Company
Timothy Krantz, Mark Valco, NASA Glenn Research Center