In a recent announcement, the Federal Aviation Administration released new design guidelines for vertiports and vertistops, infrastructure intended to support electric aircraft that take off and land vertically. Design standards incorporate input from industry partners and the public and are based on research conducted by the FAA.
FAA Associate Administrator for Airports Shannetta Griffin, PE, believes the United States is entering a new era of aviation. “These vertiport design standards provide the foundation needed to begin building infrastructure safely in this new era,” she noted in FAA announcement.
The design guidelines cover both public and private vertiports and vertistops that enable electric vertical take-off and landing (eVTOL). Additionally, recommendations listed in associated FAA documents engineering dissertation are described as prescriptive and conservative. The FAA notes that vertiport design guidelines are likely to evolve in the future to a performance-based standard. Therefore, the recently published standards are intended to serve as a guide in the meantime.
The design standards include recommendations for the design and geometry of the area in a dedicated take-off and landing vertiport. This includes the touchdown and take-off (TLOF) area, the final approach and take-off (FATO) area, and the safety zone surrounding the FATO.
The TLOF, per FAA guidelines, must be on flat ground or on a level structure, and it must be centered in the FATO. The FATO design should assume dynamic loads of 150% of the maximum take-off weight of the eVTOL. The FATO and the safe zone must have the same shape as the TLOF (circular, square or rectangular).
The FAA also makes recommendations for the approach/departure path for visual flight rules (VFR) operations. Preferred paths for eVTOL approach and departure should be aligned with the prevailing wind direction whenever possible. Ideally, any additional approach and departure paths should be separated from the preferred flight path by at least 135 degrees.
Another section of the design standards covers electrical charging and vertiport infrastructure for battery-powered aircraft. “The electrification of aerospace propulsion systems is an evolving field with few industry-specific standards,” the document states. The FAA recommends that designers of charging infrastructure for vertiports consider several aircraft-specific systems.
The design guidelines refer to a number of design considerations for vertiport charging infrastructure. These include airport/vertiport firefighting and safety considerations, such as the 2021 International Fire Code; Occupational Safety and Health Administration (OSHA) considerations, such as storage and handling of lithium batteries; and power quality considerations, including Institute of Electrical and Electronics Engineers (IEEE) standards.
The FAA also offers a guide for the development of vertiport facilities at airports. The agency notes that separate facilities and procedures for eVTOL aircraft may be required once traffic volume reaches a certain point to affect the operations of other aircraft at the airport.
The TLOF of a vertiport or vertistop built at an airport, according to the FAA, should be located where access to the airport terminal is readily available. For eVTOL aircraft that can perform conventional take-off and landing on a runway, the TLOF can be constructed in a location that provides access to fixed-wing aircraft movement areas.
These design guidelines were released by the FAA in late September. ASTM International, the standards development organization, has also released a new standard in august which provides advice to states and municipalities for the design and development of vertiports and vertistops.
In addition, the European Union Aviation Safety Agency (EASA) has published “Prototype Technical Design Specifications for Vertiports”, a document offering technical guidance and best practices for urban air mobility infrastructure in Europe. These recommendations were published in March 2022 and EASA expects to publish a Notice of Proposed Amendment in the second half of 2023.