I think it would be acknowledged by the most impartial eye to have many recommendations.
But as it was not to be supposed that Captain Tilney, whenever he made his application, would give his father any just idea of Isabella’s conduct, it occurred to her as highly expedient that Henry should lay the whole business before him as it really was, enabling the general by that means to form a cool and impartial opinion, and prepare his objections on a fairer ground than inequality of situations.
There are no more uses of "impartial" in the book.
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An impartial judge is necessary for a fair trial.
Some studies require the impartial eye of a scientist.