# Special Conditions: Bell Helicopter Textron, Inc. (BHTI), Model 525 Helicopters; Flight Envelope Protection
> **Rule** · Final special conditions. · Published 2018-10-12 · Effective 2018-11-13 · 83 FR 51623
## Document
- **Document number:** 2018-22267
- **Category:** other
- **Type:** Rule
- **Action:** Final special conditions.
- **Citation:** 83 FR 51623
- **Publication date:** 2018-10-12
- **Effective date:** 2018-11-13
- **FAA docket:** Docket No.FAA-2017-1127
## Abstract

These special conditions are issued for the BHTI Model 525 helicopter. This helicopter will have a novel or unusual design feature associated with fly-by-wire flight control system (FBW FCS) flight envelope protection. 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/2018/10/12/2018-22267/special-conditions-bell-helicopter-textron-inc-bhti-model-525-helicopters-flight-envelope-protection)
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