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End  Housing  Assemblies  
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TM-750-116 Topographic Support System (TSS) Downsized Direct Support Section (DDSS) Manual
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Commanderís Relay Assembly
TM   750-116 3-13.   SIGHTS. a.  BFV  TOW/TOW2  SUBSYSTEM  (M2,  M3, M2A1, M3A1, M2A2, AND M3A2 (figs. 3-47 through  3-  52). (1)  Backup  Sight,  PN  12316793,  (fig.   3-47). NOTE The end assembly for the M17BlC (fig. 3-46) is purged and charged in the same manner as the M17A1 and M17C with the exception of removing two outlet screws instead of one. Refer to para 3-12.c.(2) for procedures. Figure  3-46  M17B1C  End  Assembly Figure  3-47  Backup  Sight,  PN  12316793 NOTE The backup sight must be moved to gunner’s position and the commander’s hatch cover opened and secured before purging and charg- ing.  Refer  to  TM  9–2350-252-10-2. (a) Perform  purging  and  charging  procedure  para 2-5.b. (b) Open  valve  stem  (outlet  screw)  on  outer  head assembly onlv three turns for purge procedure. (c) Purge instrument at 5 psig for 5 minutes. (d) Close  valve  stem  (outlet  screw)  on  outer  head assembly. (e) Charge  instrument  at  5  psig. (f) Leak  test  for  minimum  of  5  minutes. (g) Close hatch and secure commander’s hatch cover. (2)  Integrated  Sight  Unit  (figs.  3-48  and  3-49). Figure  3-48  Integrated  Sight  Unit ISU seals could rupture if pressure is too high. Never let low pressure gage get higher than 4 psig. (a) Open  and  secure  gunner’s  hatch  cover.  (Refer  to TM  9-2350-252-l0-2  for  M2,  M3,  M2A1,  and  M3A1  or TM  9-2350-282-l0-2  for  M2A2  and  M3A2.) (b) For M2, M3, M2A1, and M3A1 only, open sight shield  assembly  per  TM  9-2350-252-20–2-3. (c) For  M2A2  and  M3A2  only,  remove  ballistic sight  shield  assembly  per  TM  9-2350-284-20-2-3. 3-21

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