Southwest Fuel Systems announces new MRO capability for M250 engines

M International’s subsidiary company Southwest Fuel Systems (SWF) has announced its 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-C40/C47 series of gas turbine engines.

Southwest Fuel Systems can now provide full-service MRO and exchange services for original Triumph-manufactured hydromechanical units on the Rolls-Royce M250-C40/C47 series engines. SWF Photo

Ralph Bishop, president of Southwest Fuels, stated, “As a Triumph authorized engine and control maintenance center for HMUs, our goal is to provide faster turnaround for overhaul and exchange HMUs along with a better price. This industry was ripe for a new support team, and Southwest Fuels accepts this challenge – let us address your next HMU need.”

The M250-C40/C47 series engine incorporates 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 — one electronic control unit (ECU) and one HMU.


The HMU is engine-mounted and driven by the N1 gear train and includes a fuel metering unit and both a boost stage (high performance liquid ring) fuel pump and a main fuel pump (gear stage). The following HMUs are supported by SWF:

  • Rolls-Royce C40B engine for the Bell 430
  • Rolls-Royce C47B engine for the Bell 407/GX/GXP
  • Rolls-Royce C47B/8 for the Bell 407GXi
  • Rolls-Royce C47M for the MD 600

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