Table 2-2. Propeller Defects

Figure 2-2. Hartzell Constant-Speed Propellor

Table 2-2. Propeller Defects - CONT - TM-1-1500-204-23-5_22

TM-1-1500-204-23-5 General Aircraft Maintenance Manual
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TM 1-1500-204-23-5 Table 2-2. Propeller Defects Defect Definition Battered A damaged or worn area caused by hard usage or heavy blows. Binding An area of damage caused by parts sticking together. Blistering Raised areas of plate indicative of a lack of bond between plating and base metal or overheating above the melting temperature of the plating material. Bowed A bent blade usually caused by foreign objects. Brinelled Having one or more indentations on bearing races, usually caused by high static loads or application of force during installation or removal. Indentations are rounded or spherical due to the impression left by the contacting balls or rollers of the bearing. Burr A ragged or turned out edge usually resulting from machine processing. Chafing A condition caused by a rubbing action between two parts under light pressure which results in wear. Checked A condition in which there are numerous small cracks in the metal, usually caused by machine processing. Chipping The breaking away of pieces of material which is usually caused by excessive stress concentration or careless handling. Circumferential Scratching Damage from scratching on the external boundary or surface of an object. Corrosion Loss of metal by a chemical or electrochemical action. The corrosion products generally are easily removed by mechanical means. Iron rust is an example of corrosion. Crack A partial separation of material usually caused by vibration, over-loading, internal stresses, defective assembly, or fatigue. Depth may be a few thousandths to the full thickness of the piece. Dent A small, rounded depression in a surface usually caused by the part being struck with a rounded object. Deposits Material that has accumulated in recessed areas. Discoloration Discoloration is due to the effects of heat in the presence of oxygen. Surface colors may range from light straw to gray depending on the environment temperature and the thickness of the oxide film that is formed on the surface. 2-6

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