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Rate  Tachometer  (fig.  3-9)
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TM-750-116 Topographic Support System (TSS) Downsized Direct Support Section (DDSS) Manual
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Telescope,  Mount,  M187  (fig.  3-16).
3-6 TM  750-116 NOTE Some  early  manufacture  boresight  inlet  ports were equipped with metric threads. To attach the hose asembly to these units, it is necessary to use the 10-32 adapter supplied with the purging kit. Insert the adapter carefully and do not force the adapter past its binding point. (2) Perform  purging  procedure  para  2-5.d. (3) Purge instrument at 5 psig for 5 minutes. (4) Install the rubber protective head cover on the boresight. b. M26A1/M27A1 Muzzle Boresight (fig. 3-12). Figure  3-12  M26A1/M27A1  Muzzle  Boresight (1) Release  pressure  from  optical  unit  by  removing pneumatic inlet port cap and depressing valve core . (2) Attach  hose  assembly  to  angle  valve  (special  tool, TM9-4933-259-14&P) and install angle valve on inlet port. (3) Turn  angle  valve  T  clockwise  (CW)  until  snug. (4) Perform  purging  and  charging  procedure  para 2-5.b. (5) Purge instrument at 5 psig for 5 minutes or until all traces of moisture in optical unit are removed. (6) Charge instrument at 3 psig maintaining pressure for 10 seconds. (7) Turn angle valve T counterclockwise (CCW) until snug. (8) Remove hose assembly and angle valve from inlet port  core. (9) Leak test for minimum of 5 minutes. 3-8.  MOUNTS,  TELESCOPE. a. Telescope Mount, M137 (fig. 3-13). Figure  3-13  M137  Telescope  Mount (1) Perform  purging  procedure  para  2-5.c. (2) Purge  instrument  at  5  psig  for  5  minutes. b. Telescope Mount, M145/M145A1 (fig. 3-14). Figure  3-14  M145/M145A1  Telescope  Mount (1) Perform  purging  procedure  para  2-5.c. (2) Purge  instrument  at  5  psig  for  5  minutes.

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