# Installation and Operation of Flightdeck Installed Physical Secondary Barriers on Transport Category Airplanes in Part 121 Service
> **Rule** · Final rule. · Published 2023-06-26 · Effective 2023-08-25 · 88 FR 41295
## Document
- **Document number:** 2023-13071
- **Category:** other
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 88 FR 41295
- **Publication date:** 2023-06-26
- **Effective date:** 2023-08-25
- **FAA docket:** Docket No.: FAA-2022-0772
## Abstract

This final rule implements a mandate in the FAA Reauthorization Act of 2018 by requiring that certain airplanes used to conduct domestic, flag, or supplemental passenger-carrying operations have installed a physical secondary barrier that protects the flightdeck from unauthorized intrusion when the flightdeck door is opened.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2023/06/26/2023-13071/installation-and-operation-of-flightdeck-installed-physical-secondary-barriers-on-transport-category)
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