# Special Conditions: St. Louis Helicopter, LLC; Textron Aviation B300, B300C, B300C (MC-12W), and B300C (UC-12W) Airplanes; Installation of Rechargeable Lithium Batteries
> **Rule** · Final special conditions; request for comments. · Published 2018-05-03 · Effective 2018-05-03 · 83 FR 19427
## Document
- **Document number:** 2018-09350
- **Category:** other
- **Type:** Rule
- **Action:** Final special conditions; request for comments.
- **Citation:** 83 FR 19427
- **Publication date:** 2018-05-03
- **Effective date:** 2018-05-03
- **FAA docket:** Docket No. FAA-2018-0374
## Abstract

These special conditions are issued for the Textron Aviation models B300, B300C, B300C (MC-12W), and B300C (UC-12W) series airplanes. The airplane, as modified by St. Louis Helicopter LLC, will have a novel or unusual design feature associated with the installation of a rechargeable lithium battery. The applicable airworthiness regulations do not contain adequate or appropriate safety standards for this design feature. These special conditions contain the additional safety standards the Administrator considers necessary to establish a level of safety equivalent to that established by the existing airworthiness standards.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2018/05/03/2018-09350/special-conditions-st-louis-helicopter-llc-textron-aviation-b300-b300c-b300c-mc-12w-and-b300c-uc-12w)
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