# Airworthiness Directives; The Boeing Company Airplanes
> **Rule** · Final rule. · Published 2016-12-29 · Effective 2017-02-02 · 81 FR 95857
## Document
- **Document number:** 2016-30279
- **Category:** airworthiness
- **Manufacturer:** The Boeing Company
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 81 FR 95857
- **Publication date:** 2016-12-29
- **Effective date:** 2017-02-02
- **FAA docket:** Docket No. FAA-2016-6898
## Abstract

We are adopting a new airworthiness directive (AD) for all The Boeing Company Model MD-90-30 airplanes. This AD was prompted by reports of stick shaker activation at airspeeds that were above the stall protection system's stick shaker schedule. This AD requires installing angle-of-attack (AOA) sensor external case heaters on the existing AOA sensors, installing additional wires, and doing a functional test and applicable corrective actions. We are issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2016/12/29/2016-30279/airworthiness-directives-the-boeing-company-airplanes)
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