StacksVerified U.S. regulatory reference

14 CFR §171.251

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
This subpart sets forth minimum requirements for the approval and operation of non-Federal Interim Standard Microwave Landing System (ISMLS) facilities that are to be involved in the approval of instrument flight rules and air traffic control procedures related to those facilities.