Data / Federal rules / 2026-05264
Special Conditions: Textron Aviation Inc. (Textron) Model MU-300-10, 400, 400A Airplanes; Rechargeable Lithium Batteries and Battery System Installations
The Federal Aviation Administration published this final rule in the Federal Register on March 18, 2026. It took effect on March 18, 2026. Comments closed on May 4, 2026.
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What the agency says
These special conditions are issued for the Textron Model MU- 300-10, 400, and 400A airplanes. These airplanes 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 an emergency lighting power supply containing rechargeable lithium batteries. 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 those established by the existing airworthiness standards.
Key facts
- Document number
- 2026-05264
- Type
- Final rule
- Action
- Final special conditions; request for comments
- Agency
- Transportation Department; Federal Aviation Administration
- Published
- March 18, 2026
- Takes effect
- March 18, 2026
- Comments due
- May 4, 2026
- Dates
- This action is effective on Textron on March 18, 2026. Send comments on or before May 4, 2026.
- Docket
- Docket No. FAA-2026-1132; Special Conditions No. 25-887-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 2026-10-24. 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.