14 CFR 171.21

§ 171.21 Scope.

United States · 14 CFR — Aeronautics and Space · Status: effective

Cite this

Citation: 14 CFR 171.21, § 171.21 Scope, United States, version 1 as recorded 2026-07-09, yourstate.us, https://yourstate.us/provision/58101
Permanent ID: ys:prov:58101@1
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Full text

(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.

Legislative history

This is a federal regulation, adopted through agency rulemaking under the Administrative Procedure Act — not enacted by a recorded vote of Congress.