18.1 Introduction

Risk assessment has been used to analyze a wide range of industries to determine vulnerabilities with the ultimate purpose of eliminating the sources of risk or reducing them to a reasonable level. The purpose of this chapter is to show how risk assessment tools can be used to develop risk models of aviation maintenance tasks. Two tools will be discussed in this chapter, although many other methods exist. The tools discussed in this chapter are as follows:

• failure mode and effect analysis (FMEA);
• event and fault tree analysis.