RTX Corporation (NYSE:RTX) is in advanced talks to sell a unit of its Collins Aerospace division to private equity firm Arcline Investment Management LP, according to people familiar with the matter. Arcline-backed Signia Aerospace could announce an agreement to acquire the Collins Hoist and Winch business as soon as this week, the people said, asking not to be identified because the information is private. A deal may value the operations at $500 million or more, they said.