# Special Conditions: Blackhawk Aerospace Technologies, Textron Model 500 Series Airplanes; Rechargeable Lithium Batteries and Battery System Installations
> **Rule** · Final special conditions; request for comments. · Published 2023-04-03 · Effective 2023-04-03 · 88 FR 19547
## Document
- **Document number:** 2023-06729
- **Category:** other
- **Type:** Rule
- **Action:** Final special conditions; request for comments.
- **Citation:** 88 FR 19547
- **Publication date:** 2023-04-03
- **Effective date:** 2023-04-03
- **FAA docket:** Docket No. FAA-2022-1441
## Abstract

These special conditions are issued for the Textron Model 500/ 550/S550/560/560XL/560XLS airplanes. These airplanes, as modified by Blackhawk Aerospace Technologies (Blackhawk), 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 electronic GI 275 Standby Instruments containing rechargeable lithium-ion 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 that established by the existing airworthiness standards.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2023/04/03/2023-06729/special-conditions-blackhawk-aerospace-technologies-textron-model-500-series-airplanes-rechargeable)
---
*AI Analytics · CC0 1.0*