Combined Control Units (CCUs) are increasingly used in aerospace, defense, rail, and industrial systems to integrate hydraulic, pneumatic, and electronic control functions into a single compact unit. This presentation explains why traditional component-level testing is often insufficient for CCUs and why system-level validation using dedicated test benches is becoming essential. It covers real-world testing challenges, common failure modes, and the growing industry shift toward bench-based CCU validation. The slides are intended for engineers, test professionals, and system integrators working with safety-critical and integrated control systems. Further reading and technical reference: • Engineering resource on CCU testing https://neometrixgroup.com/resources/?p=492 • Practical CCU test bench reference https://neometrixgroup.com/products/combined-control-unit-test-bench-manufacturer

1. Why Combined Control Unit (CCU)
Testing Is Becoming Essential
• Engineering perspective on testing integrated
control systems
• Neometrix Engineering Resources

2. What Is a Combined Control Unit
(CCU)?
• • Integrated control assembly
• • Combines hydraulic, pneumatic, and
electronic functions
• • Used in aerospace, defense, rail, and
industry
• • Reduces system footprint

3. Shift Toward Integrated Control
Systems
• • Move from standalone modules
• • Compact multi-function units
• • Higher efficiency, higher testing complexity

4. Why CCUs Are Hard to Test
• • Subsystem interactions
• • Failures under load
• • Timing and pressure dependencies

5. Why Component Testing Falls Short
• • Subsystems tested in isolation
• • Interactions remain unverified
• • Issues appear late in lifecycle

6. What Is a CCU Test Bench?
• • Tests CCU as a complete system
• • Simulates real operating conditions
• • Enables system-level validation

7. What a CCU Test Bench Enables
• • Controlled pressure and flow
• • Electrical signal simulation
• • Repeatable test cycles
• • Fault-condition testing

8. Importance in Safety-Critical
Industries
• • Aerospace & Aviation
• • Defense systems
• • Railways
• • Heavy industrial machinery

9. Industry Shift in Testing Strategy
• • Design validation
• • Production acceptance
• • Maintenance and overhaul
• • Failure investigation

10. Engineering Takeaway
• • CCUs are system-level devices
• • System-level testing is essential
• • Testing strategy must evolve

11. Further Reading
• Engineering Resource:
• https://neometrixgroup.com/resources/?
p=492
• Product Reference:
• https://neometrixgroup.com/products/
combined-control-unit-test-bench-
manufacturer

12. Thank You
• Neometrix Engineering Resources
• Testing • Validation • Reliability