5.443C The use of the frequency band 5 030-5 091 MHz by the aeronautical mobile (R) service is limited to internationally standardized aeronautical systems. Unwanted emissions from the aeronautical mobile (R) service in the frequency band 5 030-5 091 MHz shall be limited to protect RNSS system downlinks in the adjacent 5 010-5 030 MHz band. Until such time that an appropriate value is established in a relevant ITU R Recommendation, the e.i.r.p. density limit of −75 dBW/MHz in the frequency band 5 010-5 030 MHz for any AM(R)S station unwanted emission should be used. (WRC 12)
5.443D In the frequency band 5 030-5 091 MHz, the aeronautical mobile-satellite (R) service is subject to coordination under No. 9.11A. The use of this frequency band by the aeronautical mobile-satellite (R) service is limited to internationally standardized aeronautical systems. (WRC 12)
5.444 The frequency band 5 030-5 150 MHz is to be used for the operation of the international standard system (microwave landing system) for precision approach and landing. In the frequency band 5 030-5 091 MHz, the requirements of this system shall have priority over other uses of this frequency band. For the use of the frequency band 5 091-5 150 MHz, No. 5.444A and Resolution 114 (Rev.WRC-15) apply. (WRC 15)
US211 In the bands 1670-1690, 5000-5250 MHz and 10.7-11.7, 15.1365-15.35, 15.4-15.7, 22.5-22.55, 24-24.05, 31.0-31.3, 31.8-32.0, 40.5-42.5, 116-122.25, 123-130, 158.5-164, 167-168, 191.8-200, and 252-265 GHz, applicants for airborne or space station assignments are urged to take all practicable steps to protect radio astronomy observations in the adjacent bands from harmful interference; however, US74 applies.
US260 Aeronautical mobile communications which are an integral part of aeronautical radionavigation systems may be satisfied in the bands 1559-1626.5 MHz, 5000-5250 MHz and 15.4-15.7 GHz.
US444 The frequency band 5030-5150 MHz is to be used for the operation of the international standard system (microwave landing system) for precision approach and landing. In the frequency band 5030-5091 MHz, the requirements of this system shall have priority over other uses of this band. For the use of the frequency band 5091-5150 MHz, US444A and Resolution 114 (Rev.WRC-12) of the ITU Radio Regulations apply.

Wiki entries

Uncrewed Aircraft System (UAS) Services

Current Use 5030–5091 MHz UAS systems

By virtue of Part 88 of the FCC's rules, created in 2024, the 5030-5091 MHz band is designated for use by UAS systems in the United States.

According to the FCC (FCC-24-91):

"We enable UAS operators to access dedicated spectrum for control-related communications with the required reliability. Specifically, we adopt new UAS service rules under new rule part 88 that provide operators the ability to obtain direct frequency assignments in a portion of the 5030-5091 MHz band. Under these rules, one or more dynamic frequency management
systems (DFMSs) will manage and coordinate access to the spectrum and enable its safe and efficient use, by providing requesting operators with temporary frequency assignments to support UAS control link communications with a level of reliability suitable for operations in controlled airspace and other safetycritical circumstances. To provide this level of safety and reliability, we are adopting technical requirements drawn from minimum operational performance standards that were developed by an aviation industry standards body specifically to support UAS control links in the 5030-5091 MHz band and were approved by the Federal Aviation Administration (FAA) for this purpose. To address concerns regarding the impact of these aeronautical operations on adjacent services, we locate these operations, for now, in the central part of the band, with substantial separation from the bands adjacent to the 5030-5091 MHz band. We find wide support for enabling early, direct access to a portion of the band for protected assignments under DFMS coordination, and anticipate that such access will facilitate the safe integration of UAS operations into the NAS so that the United States can realize the enormous potential benefits that UAS operations can provide."