2024-29490

Document Headings Document headings vary by document type but may contain the following: • the agency or agencies that issued and signed a document • the number of the CFR title and the number of each part the document amends, proposes to amend, or is directly related to • the agency docket number / agency internal file number • the RIN which identifies each regulatory action listed in the Unified Agenda of Federal Regulatory and Deregulatory Actions See the Document Drafting Handbook for more details. Department of Transportation Federal Aviation Administration • 14 CFR Part 33 • [Docket No. FAA-2022-1641; Special Conditions No. 33-028-SC] AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Final special conditions. SUMMARY: These special conditions are issued for BETA Technologies Inc. (BETA) Model H500A electric engines that operate using electrical technology installed on the aircraft, for use as an aircraft engine. These engines will have a novel or unusual design feature when compared to the state of technology envisioned in the airworthiness standards applicable to aircraft engines. This design feature is the use of an electric motor, motor controller, and high-voltage systems as the primary source of propulsion for an aircraft. The applicable airworthiness regulations do not contain adequate or appropriate safety standards for this design feature. These special conditions contain the additional safety standards that the Administrator considers necessary to establish a level of safety equivalent to that established by the existing airworthiness standards. DATES: Effective January 16, 2025. FOR FURTHER INFORMATION CONTACT: Mark Bouyer, Engine and Propulsion Standards Section, AIR-625, Technical Policy Branch, Policy and Standards Division, Aircraft Certification Service, 1200 District Avenue, Burlington, Massachusetts 01803; telephone (781) 238-7755; mark.bouyer@faa.gov. SUPPLEMENTARY INFORMATION: Background On January 27, 2022, BETA applied for a type certificate for its Model H500A electric engines. The BETA Model H500A electric engine initially will be used as a “pusher” electric engine in a single-engine airplane that will be certified separately from the engine. A typical normal category general aviation aircraft locates the engine at the front of the fuselage. In this configuration, the propeller attached to the engine pulls the airplane along its flightpath. A pusher engine is located at the rear of the fuselage, so the propeller attached to the engine pushes the aircraft instead of pulling the aircraft. The BETA Model H500A electric engine is comprised of a direct drive, radial-flux, permanent-magnet motor, divided in two sections, each section having a three-phase motor, and one electric power inverter controlling each three-phase motor. The magnets are arranged in a Halbach magnet array, and the stator is a concentrated, tooth-wound configuration. A stator is the stationary component in the electric engine that surrounds the rotating hardware; for example: the BETA propeller shaft, which consists of a bonded core with coils of insulated wire, known as the windings. When alternating current is applied to the coils of insulated wire in a stator, a rotating magnetic field is created, which provides the motive force for the rotating components. ( printed page 101855) Type Certification Basis Under the provisions of 14 CFR 21.17(a)(1), generally, BETA must show that Model H500A electric engines meet the applicable provisions of 14 CFR part 33 in effect on the date of application for a type certificate. If the Administrator finds that the applicable airworthiness regulations ( e.g., part 33) do not contain adequate or appropriate safety standards for the BETA Model H500A electric engines because of a novel or unusual design feature, special conditions may be prescribed under the provisions of § 21.16. …

Fonte: Federal Register (federalregister.gov). Texto original em inglês. Conteúdo sanitizado por segurança.