Fly an illegitimate NDB: no, not in actual IMC. But just because your ADF hasn't worked since the Clinton era doesn't mean you can't fly an NDB just ... development framework ): An article from: IFR

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Title: Fly an illegitimate NDB: no, not in actual IMC. But just because your ADF hasn't worked since the Clinton era doesn't mean you can't fly an NDB just for the fun and challenge of it.(PROFICIENCY)(non-directional beacon, instrument meteorological conditions and application development framework )
Author: Jeff Van West
Publication:IFR (Magazine/Journal)
Date: January 1, 2011
Publisher: Belvoir Media Group, LLC
Volume: 27 Issue: 1 Page: 6(3)

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