When making an initial approach to a radio navigation facility under IFR, no person may descend below the pertinent minimum altitude for initial approach (as specified in the instrument approach procedure for that facility) until his arrival over that facility has been definitely established.
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14 CFR · PART 121
§ 121.661 Initial approach altitude: Flag operations.
Official text · Current as of Oct 19, 2026 · from eCFR
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