EAST HARTFORD, Conn. (AP) — Aerospace giant United Technologies Corp. is seeking state tax assistance for a $500 million expansion of its research and manufacturing facilities in Connecticut.

Gov. Dannel P. Malloy and CEO Louis Chenevert (shen-eh-‘VAYRT) said Wednesday the Hartford conglomerate will build corporate headquarters and an engineering center for jet engine maker Pratt & Whitney in East Hartford. It also promised to keep the corporate headquarters for helicopter maker Sikorsky in Connecticut for at least five years.