# Special Conditions: H4 Aerospace (UK) Ltd, The Boeing Company Model 757-200 Series Airplane; Seats With Non-Traditional, Large, Non-Metallic Panels
> **Rule** · Final special conditions; request for comments. · Published 2025-09-23 · Effective 2025-09-23 · 90 FR 45659
## Document
- **Document number:** 2025-18359
- **Category:** other
- **Type:** Rule
- **Action:** Final special conditions; request for comments.
- **Citation:** 90 FR 45659
- **Publication date:** 2025-09-23
- **Effective date:** 2025-09-23
- **FAA docket:** Docket No. FAA-2025-2416
## Abstract

These special conditions are issued for The Boeing Company (Boeing) Model 757-200 series airplane. This airplane, as modified by H4 Aerospace (UK) Ltd (H4 Aerospace), will have a novel or unusual design feature when compared to the state of technology envisioned in the airworthiness standards. This design feature is associated with seats that include non-traditional, large, non-metallic panels. 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/2025/09/23/2025-18359/special-conditions-h4-aerospace-uk-ltd-the-boeing-company-model-757-200-series-airplane-seats-with)
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