The appeal will be heard in London on May 3, with Hartley not being selected by Northampton until the matter is resolved.
Hartley is currently suspended until October 17, three days before the Rugby World Cup final in Paris.
The uncapped 21-year-old was rated as a strong contender to make England's two-Test South Africa tour next month, and then possibly the World Cup squad.
He will miss relegation-threatened Northampton's Guinness Premiership clash against London Irish on Saturday, when defeat would effectively send Saints sliding into National League One.







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