Special Conditions: Textron Aviation Inc. (Textron) Model MU-300-10, 400, 400A Airplanes; Rechargeable Lithium Batteries and Battery System Installations
Special conditions are rules the FAA writes for one design when the standard certification rules do not cover something new about it. These were published March 18, 2026 for Textron Aviation INC., covering the MU-400A, MU-400, MU-300. System: electric propulsion.
What it applies to
- Applicant
- Textron Aviation INC.
- Makes
- Textron Aviation Inc.
- Models
- MU-400A, MU-400, MU-300
- On this site
- Mitsubishi MU-300 17 registered
- Published
- March 18, 2026
- Effective
- March 18, 2026
- The FAA's document
- On the FAA's site
The FAA's summary their words, unchanged
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.
Source: FAA special conditions (final) from the Dynamic Regulatory System; the Federal Register carries the same notices.