TOKYO (Reuters) - Japanese auto safety parts supplier Takata Corp <7312.T> said on Thursday it expected to book a special profit of about 10 billion yen ($99 million) in the July-September quarter from the sale of U.S. interiors unit Irvin Automotive Products Inc.

Takata is selling the unit to Detroit automotive supplier Piston Group. The deal is not directly related to the larger effort to secure a lifeline for Takata and its primary seat belt and air bag businesses.

Takata said in a statement it was currently calculating the impact on its full-year financial forecasts, adding it would announce any change as soon as it could.

(Reporting by Chang-Ran Kim; Editing by Joseph Radford)