# Special Conditions: Boeing Model 737-900ER series airplanes; Interaction of Systems and Structures
> **Rule** · Final special conditions. · Published 2007-03-26 · Effective 2007-03-19 · 72 FR 14035
## Document
- **Document number:** E7-5508
- **Category:** other
- **Type:** Rule
- **Action:** Final special conditions.
- **Citation:** 72 FR 14035
- **Publication date:** 2007-03-26
- **Effective date:** 2007-03-19
- **FAA docket:** Docket No. NM357
## Abstract

This special condition is issued for the Boeing Model 737- 900ER airplane. This airplane will have a novel or unusual design feature(s) associated with the interaction of systems and structures. The applicable airworthiness regulations do not contain adequate or appropriate safety standards for this design feature. This special condition contains 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/2007/03/26/E7-5508/special-conditions-boeing-model-737-900er-series-airplanes-interaction-of-systems-and-structures)
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