# Modification of Restricted Areas R-6501A and R-6501B; Underhill, VT
> **Rule** · Final rule. · Published 2022-09-22 · Effective 2022-12-29 · 87 FR 57817
## Document
- **Document number:** 2022-20577
- **Category:** other
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 87 FR 57817
- **Publication date:** 2022-09-22
- **Effective date:** 2022-12-29
- **FAA docket:** Docket No. FAA-2022-1116
## Abstract

This action modifies restricted areas R-6501A and R-6501B, Underhill, VT, by amending the upper altitude limit of R-6501A and the lower altitude limit of R-6501B. Certain military activities near Underhill, VT, require restricted airspace that exceeds the current 4,000-foot mean sea level (MSL) upper altitude limit of R-6501A. As a result, R-6501B must be activated, along with R-6501A, to ensure containment of the hazardous activity. Raising the upper altitude limit of R-6501A from 4,000 feet MSL to but not including 4,900 feet MSL and the lower altitude limit of R-6501B from 4,000 feet MSL to 4,900 feet MSL, will result in more efficient use of airspace by reducing the need to activate R-6501B. This modification is fully contained within the existing lateral and vertical limits of R-6501A and B. The activities conducted in these restricted airspace areas are unchanged.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2022/09/22/2022-20577/modification-of-restricted-areas-r-6501a-and-r-6501b-underhill-vt)
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