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We discovered that the WR9-type star WR 106 (HDE 313643) underwent a deepepisodic fading in 2000. The depth of the fading (dV ~ 2.9 mag) surpassed thoseof all known similar "eclipse-like" fadings in WR stars. This fading episodewas likely to be produced by a line-of-sight episodic dust formation ratherthan a periodic enhancement of dust production in the WR-star wind during thepassage of the companion star though an elliptical orbit. The overall 2000episode was composed of at least two distinct fadings. These individual fadingsseem to more support that the initial dust formation triggered a second dustformation, or that the two independent dust formations occurred by the sametriggering mechanism rather than a stepwise dust formation. We also discuss onphenomenological similarity of the present fading with the double fading of RCrB observed in 1999-2000.Comment: 3 pages, 4 figures, to appear in Astron. Astrophys. (Letters

Deep transient optical fading in the WC9 Star WR 106