Rolls-Royce M250 HMU (EMC-35A) Overhaul and Repair

Trusted MRO Solutions for Hydro Mechanical Units

Mint Turbines, in partnership with Southwest Fuel Systems, is proud to offer full-service maintenance, repair, overhaul (MRO), and exchange services for Triumph-manufactured Hydromechanical Units (HMUs) certified for use on Rolls-Royce M250-C40B and M250-C47B gas turbine engines.

Why Choose SouthWest Fuel Systems for M250 HMU Support?

✔ Authorized Triumph HMU Service Center – OEM-approved HMU MRO solutions.
✔ FAA-Certified Repair Station – Ensuring compliance and quality at every step.
✔ Extensive M250 Platform Expertise – Supporting C20, C30, C40B, and C47B engines.
✔ Rapid Turnaround Times – To keep your fleet mission-ready.
✔ Exchange Units Available – Minimize downtime with in-stock HMUs.

We understand the critical role HMUs play in regulating fuel flow and engine performance. Our team combines technical precision with a commitment to rapid turn times to keep your aircraft mission-ready.

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Phone: +1 (918) 968-9561

Supported HMU Part Numbers

Our MRO services include overhaul and repair for the following Rolls-Royce and Triumph part numbers:

Rolls-Royce P/N Triumph P/N
23057878 / 23057879 113200-01A1
23064100 113200-01A2
23057880 113200-02A2
23057883 113200-02C2
23068653 113200-02C3
23069550 113200-02C4
23072207 113200-03C4
23072732 113200-03C6
23075392 113200-04A1
23078033 113200-04A5
M250-10152 113200-04B5
23072726 113200-03C5
23075496 113200-03C7
23078035 113200-03C10
23078056 113200-03C8
23067961 114070-01A1
23068651 114070-01A
23069251 114070-01A3
23069551 114070-01A4
23070726 114375-01A1
23072208 114070-03A4
23072731 114070-03A6
23075390 114070-04A1
23078029 114070-04A5
M250-10151 114070-04B5
M250-10239 114070-04B6
M250-10136 114070-04A6
23072725 114070-03A5
23078029 114070-04A4
23078030 114070-03A10
23078031 114070-03A12
23078032 114070-03A9
23078033 113200-04A4

Applications We Support

The Rolls-Royce M250 HMU (EMC-35A) is a key component in a wide range of rotorcraft and fixed-wing platforms, including:

  • Bell 206 JetRanger

  • Bell 407

  • MD 500 series

  • OH-58 Kiowa

  • Other civil and military M250 applications

About the Rolls-Royce M250 HMU

The M250-C40B/C47B series engines utilize a Full Authority Digital Electronic Control (FADEC) system for complete automatic control of the engine, including temperature and speed limiting. The FADEC system consists of two main components:

  • Electronic Control Unit (ECU)

  • Hydromechanical Unit (HMU)

The HMU is engine-mounted and driven by the N1 gear train. It integrates a fuel metering unit, a high-performance liquid ring boost pump, and a gear stage main fuel pump to ensure precise fuel delivery and engine performance.

Frequently Asked Questions

Q: How often does an M250 HMU require overhaul?
A: Overhaul intervals vary based on operating conditions but are generally recommended every 1,800–2,000 hours.

Q: Do you provide exchange or rental HMUs?
A: Yes. We offer exchange HMUs to reduce downtime during repair or overhaul.

Q: Are Mint’s HMU services OEM-approved?
A: Mint Turbines adheres to OEM specifications using approved parts and processes to ensure compliance and performance.

SouthWest Fuel Systems Triumph Certificate | Learn more about the Triumph EMC-35A HMU