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Figure 9-18.  Reticle Patterns Superimposed on Field of View
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TM-9-254 Gearcase Transfer M548 M548A1 (
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Table 9-1.  Special Tools and Supplies
TM 9-254 Section II.  GENERAL MAINTENANCE OF OPTICAL COMPONENTS 9-3.  Cleaning Optical Components a.  Personal Cleanliness and Shop Neatness.  Personal cleanliness is a great asset toward efficiency in the handling and cleaning  of  optical  components  The  hands  should  be  washed  frequently  to  keep  them  as  free  as  possible  of  dirt  and normal  skin  oil.    Depot  level  optical  shops  are  usually  temperature  and  humidity  controlled  to  provide  the  most  ideal environment  for  working  with  optical  components.    If  a  controlled  environment  is  not  available,  a  well  ventilated  room located  above  the  first  floor  of  a  building  where  there  is  a  minimum  of  blowing  dust  is  preferred.    In  the  case  of  an instrument repair mobile van, the van should be located at a place remote from vehicular and personnel traffic.  Ideal shop conditions   are   not   always   available,   but   in   any   shop   the   floor   and   benches   should   always   be   kept   clean   and   the equipment maintained in an orderly fashion. CAUTION ·  Lens cleaning  compound  may  be  used  on  externally  exposed  lenses  of  sealed instruments,  such  as  the  objective  or  eyepiece  lens,  and  on  lens  removed  from inside the instrument lens cells.  This compound contains 70% water and if used on lenses while still in the cells the cleaner could seep around the lens and into the threads of the retaining rings thus leaving moisture in the instrument. ·  When  using  acetone  on  coated  optics,  care  should  be  exercised  to  prevent  the removal of the coating from the lens surface. ·  Acetone is detrimental to plastic.  Do not clean plastic optical components with acetone. a.   Cleaning Precautions.    To  minimize  scratching  and  chipping  during  the  cleaning  process,  optical  components  should never be jumbled together, allowed to lie unprotected on the work bench, or on the bottom of a cleaning tray.  After optical components  are  removed  from  an  optical  system,  they  should  always  be  wrapped  in  lens  tissue  for  protection  of  the optical  surfaces  until  they  are  ready  to  be  cleaned  by  the  repairperson.    Care  should  be  taken  to  keep  the  fingers  from touching the polished surfaces of a component.  Should you happen to touch a polished surface wipe off any fingerprints immediately with lens cleaner.  The oil from the skin will deteriorate the coating on the component if not removed. b.    Cleaning  Procedures.    Cleaning  optical  components  requires  various  types  of  lens  cleaning  agents,  supplies,  and equipment which are listed in table 9-1.  Some of these materials may be obtained through the supply system, but some of the tools may have to be fabricated by the repairperson. 9-13

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