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Inspection Requirements
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TM-9-254 Gearcase Transfer M548 M548A1 (
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Table 9-5.  Objective, Erector Lenses and Windows
TM 9-254 9-6. Inspecting Optical Components - Continued (9) Polished Surfaces.  Polished optical surfaces will show no evidence of grayness or stains. (10)  Reticles.    The  reticles  will  have  no  more  than  five  pits,  digs,  or  bubbles,  no  bigger  than  the  smallest reticle line, over the entire surface of the reticle. Table 9-2.  Prisms and Mirrors Estimated Number of Scratch Maximum Number of pits, Size of pits, diameter scratches size length digs, bubbles digs, bubbles up to 1.250 4 60 1/5 4 40 1.251 - 2.250 6 60 1/4 5 40 2.251 - up 8 60 5/16 6 40 Table 9-3.  Field Lenses * Estimated Number of Scratch Maximum Number of pits, Size of pits, diameter scratches size length digs, bubbles digs, bubbles up to 1.250 3 60 1/8 3 10 1.251 - 2.000 3 80 3/16 3 20 2.001 - up 3 80 1/4 3 40 *  Under  no  condition  will  scratches  and  pits,  in  the  central  area  of  the  lens  (25X  of  lens  surface)  be  greater  than  that shown. Table 9-4.  Eye Lenses Estimated Number of Scratch Maximum Number of pits, Size of pits, diameter scratches size length digs, bubbles digs, bubbles up to 1.250 3 60 1/8 3 20 1.251 - 2.000 -5 60 3/16 5 20 2.001 - up 8 60 1/4 8 20 Change 2  9-22

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