Southwest Fuel Systems is pleased to announce their approval to provide full-service maintenance, repair, overhaul (MRO) and exchange services for original Triumph manufactured Hydromechanical Units (HMU) certified for use on the Rolls-Royce M250-C40B/C47B series of gas turbine engines.
The M250-C40B/C47B series engines incorporate a Full Authority Digital Electronic Fuel Control (FADEC) system which provides complete automatic control of the engine including temperature and speed limiting. The FADEC system has two main components – an Electronic Control Unit (ECU) and a Hydromechanical Unit (HMU).
The HMU is engine mounted and driven by the N1 gear train and includes a fuel metering unit and one boost stage (high performance liquid ring) fuel pump and one main fuel pump (gear stage). The following HMU’s are supported by SWF: