# Airworthiness Directives; The Boeing Company Airplanes
> **Rule** · Final rule. · Published 2017-06-15 · Effective 2017-07-20 · 82 FR 27416
## Document
- **Document number:** 2017-12172
- **Category:** airworthiness
- **Manufacturer:** The Boeing Company
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 82 FR 27416
- **Publication date:** 2017-06-15
- **Effective date:** 2017-07-20
- **FAA docket:** Docket No. FAA-2016-9432
## Abstract

We are adopting a new airworthiness directive (AD) for certain The Boeing Company Model 737-800, -900, and -900ER series airplanes. This AD was prompted by reports of in-flight failure of the left temperature control valve and control cabin trim air modulating valve. This AD requires replacing the left temperature control valve and control cabin trim air modulating valve. We are issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2017/06/15/2017-12172/airworthiness-directives-the-boeing-company-airplanes)
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