Transportation Department, Federal Aviation Administration
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.
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 25 [Docket No. FAA-2026-1132; Special Conditions No. 25-887-SC] AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Final special conditions; request for comments. SUMMARY: 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. DATES: This action is effective on Textron on March 18, 2026. Send comments on or before May 4, 2026. ADDRESSES: Send comments identified by Docket No. FAA-2026-1132 using any of the following methods: Federal eRegulations Portal: Go to www.regulations.gov and follow the online instructions for sending your comments electronically. Mail: Send comments to Docket Operations, M-30, U.S. Department of Transportation (DOT), 1200 New Jersey Avenue SE, Room W12-140, West Building Ground Floor, Washington, DC 20590-0001. Hand Delivery or Cour…
Citation: 91 FR 12915
