Code of Federal Regulations

Title 14 - Aeronautics and Space
Volume: 3Date: 2022-01-01Original Date: 2022-01-01Title: Section 171.21 - Scope.Context: Title 14 - Aeronautics and Space. CHAPTER I - FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION (CONTINUED). SUBCHAPTER J - NAVIGATIONAL FACILITIES. PART 171 - NON-FEDERAL NAVIGATION FACILITIES. Subpart B - Nondirectional Radio Beacon Facilities.
§ 171.21 Scope. (a) This subpart sets forth minimum requirements for the approval and operation of non-Federal, nondirectional radio beacon facilities that are to be involved in the approval of instrument flight rules and air traffic control procedures related to those facilities. (b) A nondirectional radio beacon (“H” facilities domestically—NDB facilities internationally) radiates a continuous carrier of approximately equal intensity at all azimuths. The carrier is modulated at 1020 cycles per second for station identification purposes. [Doc. No. 5034, 29 FR 11337, Aug. 6, 1964, as amended by Amdt. 171-2, 31 FR 5408, Apr. 6, 1966; Amdt. 171-7, 35 FR 12711, Aug. 11, 1970]