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IR.VI.B.R2FAA-S-ACS-8C · Nov 2023Risk management

Selecting a navigation frequency.

ACS element text (the applicant demonstrates understanding of)

Selecting a navigation frequency.

Bottom line

If only one identifier is heard about every 30 seconds, the DME is functional, but the associated VOR or LOC is not. You should listen to the station identifier before relying on the instrument for navigation. For a DME with its own frequency selector, use the frequency of the associated VOR/DME or VORTAC station.

FAA references

  1. IFH ch. 9 (p. 9-17) — FAA-H-8083-15B
  2. IFH ch. 9 (p. 9-11) — FAA-H-8083-15B
  3. IFH ch. 2 (p. 2-2) — FAA-H-8083-15B
  4. AFH ch. 2 (p. 2-21) — FAA-H-8083-3C
  5. IPH ch. 4 (p. 4-35) — FAA-H-8083-16B
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