# Special Conditions: Bell Textron Inc. (Bell) Model 525 Helicopter; Static Longitudinal Stability Compliance
> **Rule** · Final special conditions. · Published 2024-08-22 · Effective 2024-08-22 · 89 FR 67851
## Document
- **Document number:** 2024-18547
- **Category:** other
- **Type:** Rule
- **Action:** Final special conditions.
- **Citation:** 89 FR 67851
- **Publication date:** 2024-08-22
- **Effective date:** 2024-08-22
- **FAA docket:** Docket No. FAA-2024-0895
## Abstract

These special conditions are issued for the Bell Model 525 helicopter. This helicopter will have a novel or unusual design feature when compared to the state of technology envisioned in the airworthiness standards for transport category helicopters. This design feature is a four-axis full authority digital fly-by-wire (FBW) flight control system (FCS) that provides for aircraft control through pilot input or coupled auto pilot modes. 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/2024/08/22/2024-18547/special-conditions-bell-textron-inc-bell-model-525-helicopter-static-longitudinal-stability)
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