Foreign objects often enter engine air intakes either accidentally or through carelessness. Items such as pens, pencils cigarette lighters etc. can be drawn out of pockets and ingested by the engine. The compressor could be damaged beyond repair. Likewise, tools left in engine intakes could be drawn in causing damage. Prior to starting an engine therefore, the AME should ensure that all tools used in the vicinity of the intakes are free of any foreign objects and the area in front of intakes should be cleared of any loose stones or rubbish . Examples of the typical types of damage to be found on compressor blades is shown in Figure and possible causes of damage and the terminology used in Figure.