Data / Federal rules / 2025-10180
Special Conditions: Delta Flight Products, Non-Rechargeable Lithium Batteries and Battery System Installations
The Federal Aviation Administration published this final rule in the Federal Register on June 4, 2025. It took effect on June 4, 2025. Comments closed on July 21, 2025.
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What the agency says
These special conditions are issued for a supplemental type certificate (STC) to install non-rechargeable lithium batteries and battery systems on certain transport-category airplanes. These airplanes, as modified by Delta Flight Products, will have a novel or unusual design feature when compared to the state of technology envisioned in the airworthiness standards for transport-category airplanes. This design feature is non-rechargeable lithium batteries and battery system installed in emergency locator transmitters (ELTs). 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.
Key facts
- Document number
- 2025-10180
- Type
- Final rule
- Action
- Final special conditions; request for comments
- Agency
- Transportation Department; Federal Aviation Administration
- Published
- June 4, 2025
- Takes effect
- June 4, 2025
- Comments due
- July 21, 2025
- Dates
- This action is effective on Delta Flight Products on June 4, 2025. Send comments on or before July 21, 2025.
- Docket
- Docket No. FAA-2025-0968; Special Conditions No. 25-879-SC
- Code of Federal Regulations
- 14 CFR 25
- Topics
- Aircraft; Aviation safety; Reporting and recordkeeping requirements
- Pages
- 3
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Read from the Federal Register API, last updated 2026-10-23. The document on federalregister.gov is the official record; dates and dockets can change through later corrections. Free to reuse with credit to SpecStream under CC BY 4.0.