MRO provider StandardAero is showcasing here at Heli-Expo a custom-overhauled hydromechanical unit (HMU) for operators of Rolls-Royce M250-C47 engines that lowers starting temperatures in warm conditions. The HMU was designed as part of StandardAero’s continuous improvement efforts on the M250-C47 engine.

Manny Atwal, vice president of StandardAero Helicopters, noted that some M250 Series IV Fadec engines flown in hot/high conditions experience elevated starting temperatures, leading operators to resort to alternate starting procedures. The custom-overhauled HMU solution, now in use on more than 20 helicopters, confirms start-temperature reductions of more than 120 deg C on several HMUs with a history of warm-starting problems, according to data provided by operators.

The Scottsdale, Ariz.-headquartered company is also expanding its helicopter engine rental pool, thanks to an agreement recently reached with Rolls-Royce for the purchase of additional rotorcraft powerplants. The pool is currently valued at $10 million and includes 25 engines and more than 70 modules, as well as additional Rolls-Royce M250-C47B and RR300 engines purchased over the past year to serve Bell 407 and Robinson R66 operators.

StandardAero, which serves customers through six authorized overhaul facilities, lays claim to owning the world’s largest lease and exchange pool of M250 engines.