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© 2026 Four Star, All rights reserved.
© 2026 Four Star,
All rights reserved.
© 2026 Four Star, All rights reserved.
© 2026 Four Star, All rights reserved.
Electromechanical
Systems
Our in-house capabilities extend to the testing, repair, and refurbishing of electromechanical actuators, including horizontal stabilizers, spoiler, and landing gear brake actuators.
Integrated Electrical and Mechanical Solutions
Four Star Accessory Overhaul provides comprehensive electromechanical accessory repair for components that connect electrical and mechanical systems across modern aircraft. From flight control actuators to environmental system motors, our certified technicians deliver precise, reliable service that ensures compliance and consistent performance for commercial, military, and business aviation operators.
Electromechanical Actuators
Four Star services the electromechanical actuators that convert electrical signals into precise mechanical motion across aircraft systems, including flight surfaces, doors, valves, and spoilers. Our aviation electromechanical accessory repair combines electrical and mechanical expertise to ensure reliable, fail-safe performance in every application.
Actuator Overhaul & Testing
We overhaul both linear and rotary actuators used in flight control, landing gear, and environmental systems. Each unit undergoes full disassembly, inspection of gears, bearings, and motors, electrical testing of windings and sensors, seal replacement, lubrication service, and load testing under simulated operating conditions.
Our technicians address wear, contamination, and control circuit issues before they lead to in-service failures. Whether servicing high-load jackscrew actuators or precision rotary units, we verify torque, speed, and feedback accuracy to deliver consistent performance across all aircraft environments.
Electromechanical Actuator Experts
Our experienced technicians are equipped with specialized tools and test equipment to repair and refurbish all types of electromechanical actuators.
From horizontal stabilizer actuators to landing gear brake actuators, we ensure your flight control and landing gear systems operate precisely and reliably.
Four Star overhauls and repairs aircraft electric motors that power pumps, fans, actuators, and other onboard systems. Our technicians service everything from fractional to multi-horsepower motors, combining mechanical precision with electrical expertise to ensure dependable, compliant performance.
Comprehensive Motor Overhaul & Testing
Our electric motor repair capabilities include bearing and brush replacement, commutator resurfacing, armature balancing, and stator winding inspection or rewinding when required. Each motor undergoes insulation resistance and hi-pot testing, along with load verification on dynamometers to confirm torque, speed, and current performance meet specifications.
We also provide brush and commutator maintenance to prevent electrical noise, wear, and efficiency loss. When failures stem from upstream electrical issues such as voltage irregularities or control faults, our system-level diagnostics identify root causes to prevent recurrence and extend service life.
Our Comprehensive
Service Guarantee
Solenoid Valves & Controls
Four Star repairs and tests electrically actuated valves that control fluid flow across aircraft hydraulic, pneumatic, and fuel systems. These solenoid valves operate thousands of cycles per flight, demanding rapid response and long-term reliability under extreme conditions.
Solenoid Valve Repair & Control Unit Testing
Our solenoid valve repair services address coil degradation, armature wear, seal and spring failures, and connector corrosion. Each valve undergoes ultrasonic cleaning, detailed dimensional inspection, coil and seal replacement, and bench testing to confirm electrical integrity, response time, and flow performance.
We also perform electromechanical control unit testing for systems that manage actuators and motors. Using specialized test stands that simulate aircraft loads and signals, our technicians validate control logic, fault detection, and output accuracy - performing authorized component-level repairs to restore full operational reliability.
Testing & Validation
Four Star performs comprehensive testing under realistic operating conditions to ensure every electromechanical accessory performs reliably after overhaul - preventing premature failures and AOG situations.
Functional & Electrical Testing
Each actuator and motor undergoes functional load testing that simulates real-world conditions to verify torque, speed, and feedback accuracy. Our dynamometer and load stand testing confirm efficiency and current behavior across the full operating range.
Electrical testing validates voltage and current performance, insulation resistance, and frequency response for both AC and DC systems. High-potential (hi-pot) testing confirms insulation integrity against voltage spikes typical of aircraft electrical systems, identifying issues before they lead to in-service failures.
Need Expert Support for Your Actuators?
From stabilizer trim actuators to brake actuators, our certified team delivers precision results.
All electromechanical repairs meet rigorous FAA and EASA requirements to ensure safety, airworthiness, and traceability. Each service is fully documented with detailed work orders, test results, and parts certification, giving operators complete confidence in regulatory compliance and audit readiness.
As an EASA- and FAA-certified overhaul station, Four Star services electromechanical components for aircraft worldwide using approved technical data and airworthiness certifications (FAA Form 8130-3 or EASA Form 1). Our engineering expertise extends beyond standard overhaul, enabling us to support both current and legacy systems with approved repair solutions when OEM parts or designs are no longer available.
With decades of platform experience, we understand the evolution of electromechanical systems across aircraft generations and apply proven insights from thousands of repairs to deliver reliable, compliant, and enduring performance for every fleet we serve.
Common Questions
About Electromechanical Systems
Repair And Refurbishment