GE Speedtronic
Mark VIe
Expert support for your Mark VIe turbine controls
AP4 provides complete Mark VIe control system parts and services to keep your plant reliable and operational.
Our experienced controls specialists support you through planned maintenance, unexpected issues, and long-term system improvements with practical solutions built around your needs.
From on-site field service and troubleshooting to Mark VIe retrofits and upgrades, remote technical support, operator training, and parts, our experts provide the assurance you need to keep your critical equipment running.
We focus on finding the right solution quickly while helping you improve reliability, reduce downtime, and extend the value of your controls assets. With deep technical expertise and responsive support, AP4 gives you the confidence to keep your Mark VIe controls—and your plant—running at their best.
GE Mark VIe Field Services and Remote Support
Services include:
DLN tuning
HMI retrofits
Loop checks and calibrations
NERC testing
New unit commissioning
Operator training
Outage support
Owner's engineer support
Preventative maintenance
Reliability assessments
TIL implementation
Troubleshooting
Spare Parts and Repairs for GE Mark VIe
Keep your critical controls running with an inventory of repaired, remanufactured, unused and new surplus parts including control cards, circuit boards, I/O packs and other components.
Our expert repairs are performed in our labs by highly experienced technicians with specialized training. All repairs undergo full functional testing using energized panels and include a test report and warranty. We maintain an inventory of spares and are committed to a fast, focused response to minimize downtime.
Our component remanufacturing process combined with strict, comprehensive in-house testing in a simulated environment has resulted in a return rate of less than 1% on all parts that we have remanufactured. This means that your replacement control cards, IO packs, and other components will function like new, all without performing an expensive upgrade or purchasing new parts with long lead times and high costs.
GE Mark VIe Training
Enhance your turbine and generator controls expertise with our on-site hands-on training courses designed for operators, supervisors, engineers, and technicians.
In our courses, you will learn fundamental tools to access, navigate, and maintain the Digital Control Panel (DCP), follow and troubleshoot alarms and auxiliary systems.
The courses can be held at your site and customized to use your site's software.
Since 2024, we have trained over 125 professionals across more than 15 plants.
Why AP4?
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Expert-led assurance
OEM-trained engineers with decades of experience in turbine controls and excitation systems.
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Fast, focused response
Direct access to decision-makers and same-day action in emergencies.
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Value-driven continuity
Extend asset life and reduce risk without overspending.
