AIM 1-1-13

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1-1-13. NAVAIDs with Voice

a. Voice equipped en route radio navigational aids are under the operational control of either an FAA Automated Flight Service Station (AFSS) or an approach control facility. The voice communication is available on some facilities. Hazardous Inflight Weather Advisory Service (HIWAS) broadcast capability is available on selected VOR sites throughout the conterminous U.S. and does not provide two-way voice communication. The availability of two-way voice communication and HIWAS is indicated in the A/FD and aeronautical charts.

b. Unless otherwise noted on the chart, all radio navigation aids operate continuously except during shutdowns for maintenance. Hours of operation of facilities not operating continuously are annotated on charts and in the A/FD.

Aeronautical Information Manual (AIM) — Chapter 1
1-1-1 - 1-1-2 - 1-1-3 - 1-1-4 - 1-1-5 - 1-1-6 - 1-1-7 - 1-1-8 - 1-1-9 - 1-1-10 - 1-1-11 - 1-1-12 - 1-1-13 - 1-1-14 - 1-1-15 - 1-1-16 - 1-1-17 - 1-1-18 - 1-1-19 - 1-1-20 - 1-1-21 - 1-1-22
1-2-1 - 1-2-2 - 1-2-3