Filtration and Contamination Control for Aerospace Hydraulic Systems

This four-hour short course provides an introduction to contamination control principles in aircraft hydraulic systems. Topics covered include an introduction to the types of contamination in aircraft hydraulic systems, contaminant measurement, and reporting methods. In addition, the impact of contamination on hydraulic components is discussed in detail. Along with an introduction to filtration mechanisms, information on testing, rating, and specifying filters will be provided.

What Will You Learn

By attending this seminar, you will be able to:
  • Associate the types of contaminant in aircraft hydraulic systems and the problems that uncontrolled contamination can cause
  • Interpret a particle count or contamination level report
  • Identify how filters work and are evaluated
  • Explain filter ratings
  • Formulate a basic specification for hydraulic filters

Is This Course For You

The course is intended for engineers with some basic knowledge of hydraulic systems, but with minimal experience with the impact of contamination and specifications of filtration products for controlling it.

Materials Provided

This data is not available at this time

Course Requirements

This data is not available at this time


  • Contamination fundamentals
    • What is particulate contamination and what are its sources
    • How are contamination levels measured
    • Reporting contamination levels in aerospace hydraulic systems
    • Measuring and reporting water contamination
  • Contamination damage
    • Types of wear that occur in hydraulic components: Abrasive; Erosive; Fatigue; Adhesive; Corrosive
    • Critical clearances and wear in hydraulic components
    • Benefits of controlling particulate contamination
    • Benefits of controlling water contamination
  • Filtration fundamentals
    • Types of filters
    • Filter construction
    • Mechanisms of filtration (how they work)
    • Water removal principles
  • Filter efficiency testing and rating basics
    • Nominal rating
    • Absolute rating
    • Gravimetric efficiency
    • Filtration (Beta) ratio [Multi-pass test]
    • Cyclic flow Multi-pass test (Stabilized cleanliness rating)
  • Other types of filter tests
  • Writing a comprehensive filter specification