Quick Answer: GE's Mark control systems are the control platforms used on GE gas and steam turbines, spanning several generations from earlier analog and relay-based designs through today's networked digital platforms. Avanti Power Components supports the full range on gas turbines (Mark I, Mark II/II ITS, Mark IV/IV+, Mark V, Mark VI, Mark VIe) and steam turbines (MHC, Mark III, Mark V, Mark Ve, Mark VI, Mark VIe), including sourcing and repair for older systems where OEM parts and support are hardest to find.
Which Mark systems does Avanti Power Components support?
On gas turbines: Mark I, Mark II and Mark II ITS, Mark IV and Mark IV+, Mark V, Mark VI, and Mark VIe. On steam turbines: MHC, Mark III, Mark V, Mark Ve, Mark VI, and Mark VIe. That covers plants running current-generation Mark VIe alongside plants still running a Mark I or Mark III that GE Vernova stopped actively supporting years ago.
What's the difference between GE's older and newer Mark control systems?
The short version: older Mark systems (Mark I through roughly Mark IV) rely more on analog and relay-based components, while Mark V and later moved to digital, networked architecture. That shift matters less for day-to-day operation and more for what happens when something fails. A digital Mark VIe fault often has documented diagnostics and available replacement modules. An analog Mark I or Mark III fault can mean a part nobody manufactures anymore, sourced from a company that may not exist under its original name.
What happens when GE no longer supports your Mark system?
Nothing happens to the turbine itself. It keeps running until a component fails. What changes is your options when that happens. This is where reverse engineering becomes the actual answer instead of a backup plan. When no supplier stocks a replacement, Avanti Power Components works from original drawings where they exist, or measures and machines a part to factory-exact spec when they don't. A MOOG hydraulic actuator rebuilt from original AutoCAD drawings, and obsolete GE Frame 5 fuel nozzles measured and machined from scratch for a plant in Glenwood, NY, are both real examples, not hypotheticals. Details in Our Work.
How do you get parts or repairs for a legacy Mark control system?
Start with what's actually failing: a specific card, module, actuator, or governor tied to your Mark system. Repair, rebuild, and calibration covers servicing existing hardware; sourcing covers finding a working replacement; reverse engineering covers building one when neither of those is possible. Request a quote with what you're running and what's failing, and Marco Orsetti, who has close to 45 years in gas turbines and power generation, will tell you directly which path applies.
Frequently asked questions
What if the part I need is obsolete or no longer manufactured?
That's a core capability, not an edge case. Avanti Power Components reverse-engineers parts when no source exists, including Mark control system components. See reverse engineering and repair.
How much does a part or repair cost?
Avanti Power Components doesn't publish pricing. Cost depends on the specific part, its condition, and the scope of work. Request a quote for a conversation about your specific need.
Do you have published case studies?
Two projects are documented so far: obsolete GE Frame 5 fuel nozzles reverse-engineered for a plant in Glenwood, NY, and a MOOG hydraulic actuator rebuild for a steam turbine application. See Our Work.