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TM-750-116 Topographic Support System (TSS) Downsized Direct Support Section (DDSS) Manual
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SIGHTS
TM   750-116 c. M17A1, M17B1C, and M17C, (figs. 3-44 through  3-46). NOTE Rangefinder end housings are purged and charged on a yearly basis; however, they must be visually inspected every 90 days. Figure  3-44  M17A1  Body  Assembly (1) (a) 2-5.a. (b) (c) (d) Body Assembly (fig. 3-44) Perform  purging  and  charging  procedure  para Purge instrument at 8 psig for 30 minutes. Ensure relief valve closes at 5 psig. Leak test for a minimum of 5 minutes. (2)  End  Housing  Assemblies  (figs.  3-45  and 3-46). NOTE Blister and splatter shields must be removed for end  housing  assembly  purging  and  charging procedures. Some end housings have a relief valve instead of an outlet screw. When there is a relief valve, disregard the procedure that removes the outlet screw. Purging pressure for end housings with relief valves must be increased to 8 psig to open the relief valve and keep it open during purging. Charging pressure for housings with relief valves is the 5 psig at which the relief valve seats. Figure  3-45  M17A1  and  M17C  End  Assembly (a) Remove inlet port cap and outlet screw with pre- formed  packing  attached. (b) 2-5.b. (c) (d) (e) Perform  purging  and  charging  procedure  para Purge instrument at 5 psig for 5 minutes. Charge instrument at 1 psig for 10 seconds. Leak test for minimum of 5 minutes. 3-20

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