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Inspecting Optical Components
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TM-9-254 Gearcase Transfer M548 M548A1 (
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Table 9-2.  Prisms and Mirrors
TM 9-254 9-6. Inspecting Optical Components - Continued (9) Pit.  A term denoting a small hole in the component surface, which can be seen as a small particle. (10)  Scratches.  Any marking or tearing of the component surface appearing as though it had been done by the sharp or rough edge of an instrument. (11)  Cement Separation.  This condition shows up as jagged lines and yellowish areas between the elements of a cemented lens. (12)  Smears.    The  faint,  but  visible  traces  of  cleaning  solution  left  on  the  optical  component  when  the cleaning procedure is improperly performed. c. Inspection Requirements.  The requirements herein shall apply to initial and in-process inspection of optical components. NOTE o     Information   contained   in   tables   9-2   through   9-6   has   been   extracted   from   Maintenance Inspection Standard for Fire Control Materiel, MIS TOE 102 and Surface Quality Elements, part number 7641866. o     The  combined  length  of  maximum  size  scratches  cannot  exceed  the  maximum  length  as indicated in tables 9-2 through 9-6.  This length is based upon the diameter of the lens. (1) Moisture and condensation.  There will be no evidence of moisture, condensation, or staining resulting from moisture. (2) Fractures.  No fractures will be allowed on optical component surfaces. (3) Smears or Fingerprints.  There will be no evidence of any smears or fingerprints on optical component surfaces. (4) Chips.  The presence of chips on optical components will be permitted provided they are honed and do not extend more than 1/16 inch into the clear aperture of the component. (5) Scratches.    Scratches  will  be  permitted  provided  the  total  effect  of  such  discrepancies  do  not  exceed that allowed in tables 9-2 through 9-6. (6) Digs,  Pits,  and  Bubbles.    Digs,  pits,  and  bubbles  will  be  permitted  in  accordance  with  criteria  given  in tables 9-2 through 9-6. (7) Coating.  Coating with not more than 25% deterioration will be acceptable provided the deterioration is not  concentrated  in  a  given  area.    Crushes  or  rubs  not  heavily  concentrated  are  permissible  provided they do not extend into the clear aperture of the component. (8) Cement Separation.  Cement separation, once started, has a tendency to spread and therefore will not be permitted. 9-21

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