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

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 - CONT Defect Definition Mismatched Damage caused when two parts are improperly matched. Nick A sharp sided gouge or depression with a V-shaped bottom which is generally the result of careless handling of tools and parts. Out-of-Round A damaged hole which does not have the same concentric center. Pickup A buildup or rolling of metal from one area to another, which is usually caused by insufficient lubrication, clearances, or foreign matter. Pitting Small, irregularly shaped cavities from which material has been removed by corrosion. Corrosion can be caused by oxidation (rust), acid attack (etching, perspiration), electrolytic attack (non-distilled water). The bottom surfaces of the cavities are usually dark. Scoring A series of deep scratches caused by foreign particles between moving parts, or careless assembly or disassembly techniques. Scratches Shallow, thin lines or marks, varying in degree of depth and width, caused by presence of fine foreign particles during operation or contact with other parts during handling. Sheared Damage caused when a part is stressed in two different directions. Spalling The breakdown of a functional/active surface due to fatigue, usually in the form of irregularly shaped pits. The edges of the pits have indications of cracking and further progression. Stripped Damaged or unusable threads of a bolt or screw. Surface Breakdown Breakdown of surface material caused by corrosion. CAUTION Acid or caustic materials should not be used. Power buffers, steel wool, steel brushes, or any other tool or substance that may scratch or mar the blade should be avoided. b. Propeller Cleaning. Propeller blades and hubs are cleaned with dry cleaning solvent, Federal Specification P-D-680 and in accordance with the applicable maintenance manual. NOTE If a high polish is desired, a number of good grades of commercial metal polish are available. After completing the polishing operation, all traces of polish should be immediately removed. When the blades are clean, they should be coated with a clean film of engine oil or suitable equivalent. c. Propeller Inspection. Inspect propellers regularly in accordance with the applicable maintenance manual. The following paragraphs explain general inspection procedures. 2-8

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