# Accommodation of Advanced Digital Communications in the 117.975-137 MHz Frequency Band and Implementation of Flight Information Services in the 136-137 MHz Frequency Band
> **Federal Communications Commission** · Final rule. · Published 2001-05-15 · Effective 2001-06-14 · 66 FR 26796
## Document
- **Document number:** 01-12162
- **Category:** spectrum-allocation
- **Federal Register citation:** 66 FR 26796
- **CFR reference:** 47 CFR 2
- **Publication date:** 2001-05-15
- **Effective date:** 2001-06-14
- **FCC docket:** WT Docket No. 00-77
## Abstract

This document amends the Commission's rules to (1) permit the Federal Aviation Administration (FAA) to use five additional channels in the 136-136.475 MHz frequency band; (2) authorize the implementation of Flight Information Services-Broadcast (FIS-B) in the 136-137 MHz band; (3) accommodate digital communications systems throughout the 117.975-137 MHz aeronautical radio spectrum; and (4) clarify that five channels previously reserved for special purpose aeronautical enroute operations in the Gulf of Mexico Region--136.775 MHz, 136.800 MHz, 136.825 MHz, 136.850 MHz and 136.875 MHz--are no longer so reserved, and thus may be licensed for general purpose aeronautical enroute operations without geographical limitation. The Commission has adopted these amendments in response to petitions for rulemaking filed by the Small Aircraft Manufacturers Association and the FAA, respectively, requesting that the Commission amend its rules to permit the implementation of FIS-B and other digital communications systems, and in response to comments on those petitions by Aeronautical Radio, Inc. and other organizations representing the aviation industry. These rule amendments will enhance the safety of aviation by alleviating spectrum congestion in the aeronautical radio frequency bands and by paving the way for the introduction of FIS-B and other new digital communications services.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2001/05/15/01-12162/accommodation-of-advanced-digital-communications-in-the-117975-137-mhz-frequency-band-and)
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