The U.S. Air Force is expected to finalize paperwork to buy 12 T56 Series 3.5 engine upgrade kits from Rolls-Royce by end of this month.
By DoD photo by Master Sgt. Ben Bloker, U.S. Air Force. (Released) [Public domain], via Wikimedia Commons
The company is anticipating further orders from the service to upgrade around 400 C-130E and C-130H engines.