# Airworthiness Directives; The Boeing Company Airplanes
> **Rule** · Final rule. · Published 2018-04-16 · Effective 2018-05-21 · 83 FR 16188
## Document
- **Document number:** 2018-07629
- **Category:** airworthiness
- **Manufacturer:** The Boeing Company
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 83 FR 16188
- **Publication date:** 2018-04-16
- **Effective date:** 2018-05-21
- **FAA docket:** Docket No. FAA-2017-0553
## Abstract

We are adopting a new airworthiness directive (AD) for all The Boeing Company Model 787-8 and 787-9 airplanes. This AD was prompted by a report that the parking brake and alternate pitch trim module (PBM) may unintentionally disengage. This AD requires replacing the PBM and doing a PBM installation test. We are issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2018/04/16/2018-07629/airworthiness-directives-the-boeing-company-airplanes)
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