AIM 2-2-2

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2-2-2. Code Beacons and Course Lights

a. Code Beacons. The code beacon, which can be seen from all directions, is used to identify airports and landmarks. The code beacon flashes the three or four character airport identifier in International Morse Code six to eight times per minute. Green flashes are displayed for land airports while yellow flashes indicate water airports.

b. Course Lights. The course light, which can be seen clearly from only one direction, is used only with rotating beacons of the Federal Airway System: two course lights, back to back, direct coded flashing beams of light in either direction along the course of airway.

NOTE - Airway beacons are remnants of the “lighted” airways which antedated the present electronically equipped federal airways system. Only a few of these beacons exist today to mark airway segments in remote mountain areas. Flashes in Morse code identify the beacon site.

Aeronautical Information Manual (AIM) — Chapter 2
2-1-1 - 2-1-2 - 2-1-3 - 2-1-4 - 2-1-5 - 2-1-6 - 2-1-7 - 2-1-8 - 2-1-9 - 2-1-10 - 2-2-1 - 2-2-2 - 2-2-3 - 2-3-1 - 2-3-2 - 2-3-3 - 2-3-4 - 2-3-5 - 2-3-6 - 2-3-7 - 2-3-8 - 2-3-9 - 2-3-10 - 2-3-11 - 2-3-12 - 2-3-13 - 2-3-14 - 2-3-15