Part 1Definitions and Abbreviations

14 CFR 1.2 — Abbreviations and Symbols

Official abbreviations used in the Federal Aviation Regulations, including AGL, MSL, VFR, IFR, and others.

Regulation Text

In Subchapters A through K of this chapter: AGL — Above Ground Level. ALS — Approach light system. ASR — Airport surveillance radar. ATC — Air traffic control. CAS — Calibrated airspeed. DME — Distance measuring equipment. EAS — Equivalent airspeed. FAA — Federal Aviation Administration. GS — Glide slope. HIRL — High-intensity runway lights. IAS — Indicated airspeed. IFR — Instrument flight rules. ILS — Instrument landing system. IM — Inner marker. INT — Intersection. LDA — Localizer-type directional aid. LMM — Locator middle marker. LOC — Localizer. LOM — Locator outer marker. MAA — Maximum authorized altitude. MALS — Medium intensity approach light system. MCA — Minimum crossing altitude.

Note: This is an excerpt. Refer to the full regulation in eCFR for the complete text.

Plain-English Explanation

This is the official list of abbreviations used throughout aviation regulations. When you see AGL, MSL, VFR, IFR, or hundreds of other abbreviations in regulations, charts, or NOTAMs, their official meanings are defined here. Pilots are expected to know these abbreviations for both exams and real-world operations.

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