---
kind: "section"
citation: "47 C.F.R. § 25.285"
title: "47"
number: "25.285"
heading: "Operation of MSS and ATC transmitters or transceivers on board civil aircraft."
url: "https://uscodex.org/cfr/47/25.285"
---

# §25.285. Operation of MSS and ATC transmitters or transceivers on board civil aircraft.

- (a) Operation of any of the following devices aboard civil aircraft is prohibited, unless the device is installed in a manner approved by the Federal Aviation Administration or is used by the pilot or with the pilot's consent:
  - (1) Earth stations capable of transmitting in the 1.5/1.6 GHz, 1.6/2.4 GHz, or 2 GHz Mobile-Satellite Service frequency bands;
  - (2) ATC terminals capable of transmitting in the 1.5/1.6 GHz or 1.6/2.4 GHz MSS bands;
  - (3) Earth stations used for non-voice, non-geostationary Mobile-Satellite Service communication that can emit radiation in the 108-137 MHz band.
- (b) No portable device of any type identified in [paragraph (a)](#a) of this section (including transmitter or transceiver units installed in other devices that are themselves portable) may be sold or distributed to users unless it conspicuously bears the following warning: “This device must be turned off at all times while on board aircraft.” For purposes of this section, a device is portable if it is a “portable device” as defined in [§ 2.1093(b)](/cfr/47/2.1093.md?p=b) of this chapter or is designed to be carried by hand.

## Notes

### Amendments

[79 FR 8325, Feb. 12, 2014]

### Source

Source: 58 FR 13421, Mar. 11, 1993, unless otherwise noted.

### Authority

Authority: 47 U.S.C. 154, 301, 302, 303, 307, 309, 310, 319, 332, 605, and 721, unless otherwise noted.

### Amendments

[79 FR 8325, Feb. 12, 2014]