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In page Phobos Surveyor:

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Pavone and his group have already constructed and tested two generations of rovers, and hopes to begin low-gravity testing of his rovers by the summer of 2013.[1][needs update] These tests will simulate the low-gravity environment of Phobos first by means of a crane and by 2015, Pavone hopes, using an aircraft designed to reduce the force of gravity for its occupants.[2][needs update] The testing arena will be designed to mimic the surface of Phobos as closely as possible, containing rocks and using flour to take the place of asteroid dust.[1]