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Asked by: 2666 views Flight Instructor

I can file IFR using an off-airway segment only if it is less than 40 nm from a defining VOR; and yet there are airway segments between VORs that exceed 80 nm.  Someone clarify please?

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2 Answers



  1. Russ Roslewski on Feb 16, 2016

    These are individually evaluated on a case by case basis for signal strength as well as co-channel interference, as well as flight checked. 40nm is the standard service volume of a VOR, but there are many exceptions to this standard.

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  2. John D Collins on Feb 16, 2016

    You can also use a GPS or suitable RNAV system for off airway legs up to 500 NM.

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