FAA Federal Aviation Regulations (FARS, 14 CFR)

(a) Subject to the applicable laws and regulations governing ownership and operation of radio equipment, each foreign air carrier shall equip its aircraft with such radio equipment as is necessary to properly use the air navigation facilities, and to maintain communications with ground stations, along or adjacent to their routes in the United States.

(b) Whenever VOR navigational equipment is required by paragraph (a) of this section, at least one distance measuring equipment unit (DME), capable of receiving and indicating distance information from the VORTAC facilities to be used, must be installed on each airplane when operated at or above 24,000 feet MSL within the 50 states, and the District of Columbia.

[Doc. No. 1994, 29 FR 1720, Feb. 5, 1964, as amended by Amdt. 129-2, 30 FR 10288, Aug. 19, 1965, Amdt. 129-7, 41 FR 47230, Oct. 30, 1976]