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

Table 2-2. Propeller Defects - CONT - TM-1-1500-204-23-5_23

TM-1-1500-204-23-5 General Aircraft Maintenance Manual
Page Navigation
12

TM 1-1500-204-23-5 Table 2-2. Propeller Defects - CONT Defect Definition NOTE Discoloration due to synthetic engine oils should not be confused with heat discoloration. Additives in Specification MIL-L-23699 oil react with steel surfaces to form a brownish color stain. This stain is not detrimental and should not be removed. Disintegrated A part which breaks or decomposes into small objects. Distortion Distortion is caused by forces which twist the piece from its original shape. Eccentric Damage not having the same geometric center. Erosion Loss of metal from the surface by mechanical action of foreign objects, such as grit or fine sand. The eroded area will be rough and may be lined in the direction in which the foreign material moved relative to the surface. Flaking The breaking loose of small pieces of metal or coated surfaces, which is usually caused by defective plating or excessive loading. Fracture A break through the entire thickness of the material. Frayed An area worn by rubbing actions. Fretting A rapid oxidation of metal surfaces caused by cyclic back-and-forth movement of closely fitted parts in the presence of oxygen. It is characterized by rusty surfaces ranging from black (well bonded) to a fairly bright brick red color (often loosely bonded or even free particles). Galling A severe condition of chafing or fretting in which a transfer of metal from one part to another occurs. It is usually caused by a slight movement of mated parts having limited relative motion and under high loads. Glazed Damage which appears smooth and glossy. Gouging A furrowing condition in which a displacement of metal has occurred (a torn effect). It is usually caused by a piece of metal or foreign material between close moving parts. Grooving A recess or channel with rounded and smooth edges usually caused by faulty alignment of parts. Indentation Shallow depressions in the functional surfaces where metal has been displaced but not removed. They are usually rounded, having the shape of the foreign particle, and the original surface finish can still be seen in the depressions. 2-7

Privacy Statement
Press Release
Contact