# Airworthiness Directives; The Boeing Company Airplanes
> **Rule** · Final rule; request for comments. · Published 2021-07-20 · Effective 2021-07-20 · 86 FR 38214
## Document
- **Document number:** 2021-15391
- **Category:** airworthiness
- **Manufacturer:** The Boeing Company
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 86 FR 38214
- **Publication date:** 2021-07-20
- **Effective date:** 2021-07-20
- **FAA docket:** Docket No. FAA-2021-0561
## Abstract

The FAA is adopting a new airworthiness directive (AD) for all The Boeing Company Model 737 airplanes. This AD was prompted by reports of latent failures of the cabin altitude pressure switches. This AD requires repetitive functional tests of the pressure switches, and on- condition actions, including replacement, if necessary. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2021/07/20/2021-15391/airworthiness-directives-the-boeing-company-airplanes)
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