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General Inspection Instructions - Continued - TM-5-4210-220-12_206
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General Inspection Instructions - Continued - TM-5-4210-220-12_208
TM 5-4210-220-12 4-9.  GENERAL MAINTENANCE PROCEDURES - Continued If discoloration can be wiped off, such marks can usually be traced to oil-burn stains which are not serious. (7) Rolling.    This  damage  usually  occurs  only  on  plastic  gears.    Rolling  is  when  material  is  pushed  out  of shape but does not break off.  It is usually caused by heavy, even loads and overheating. h. Metal Parts Visually inspect all castings and weldments for cracks.  Parts that carry a great load should be inspected by the magnetic particle method.  Non-ferrous parts may be inspected by the fluorescent penetrant method. j. Magnetic Particle Inspection This type of inspection can only be carried out on metals that can be magnetized.  If in doubt check whether a magnet  sticks  to  the  surface.    It  should  only  be  carried  out  if  parts  are  not  easily  replaceable  (cost  or  special order),  or  parts  have  been  reworked  or  reground,  or  parts  are  subject  to  high  stress.    Magnetizing  current depends  on  parts  being  magnetized  for  solid  section  parts,  current  shall  be  1000  amps  per  diameter  inch  for variable diameter thickness, current shall be adjusted for diameter inspected. · Parts shall be rejected if: (1) Indications of non-metallic inclusions are present (foreign body - solid, liquid, or gaseous) and these are longer than one inch, or indications are closer than 1/8 in. apart. (2) Any evidence of cracks are seen (3) Scattered  short  sharp  bursts  are  seen.    Bursts  are  caused  by  metals  working  at  temperatures  that weaken and break the material.  Bursts are not usually seen until the metal is cut through to the burst area. (4) Separate  short  wavy  lines  in  the  same  general  direction  are  seen.    Flakes  are  caused  by  improper cooling. They are not usually seen until the metal is cut through to the flake area. (5) Fine,  sharp,  tightly  packed  lines  are  seen  (grinding  cracks).    These  are  usually  caused  by  a  glazed grinding wheel.  The wheel, instead of cutting the material, rubs and overheats the material.  The lines are thermal cracks similar to heat treat and hardening cracks. k. Fluorescent Penetrant Inspection This  type  of  inspection  can  be  carried  on  any  metal  but  is  usually  reserved  for  non-magnetic  material  (e.g. aluminum, stainless steel).  The parts shall be warm prior to applying penetrant.  The penetrant may be applied by dipping, painting or spraying.  All surfaces to be examined shall be completely covered.  Penetrant time for various metals is as follows: Aluminum Alloy - no less than 20 minutes Magnesium Alloy - no less than 20 minutes Brass or Bronze - no less than 30 minutes Ferrous Alloys - no less than 30 minutes 4-63

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