TM-9-2350-274-BD M109 Battlefield Damage Assessment and Repair Download
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TM 9-2350-274-BD ARMAMENT AND FIRE CONTROL SYSTEM SECTION II. Armament BDAR 10-4. BORE EVACUATOR DAMAGE General Information As a round is propelled through the gun tube, gas pressure is forced inside the bore evacuator. As the round leaves the tube, bore evacuator pressure rushes out behind the round, exhausting excessive smoke and fumes. If the evacuator is damaged or leaks, this pressure is lost, causing excessive smoke and fumes to enter the turret as the breech block opens. This procedure repairs puncture damage to the bore evacuator. Limitations: ● None Personnel/Time Required: ● 1 soldier ● 1 hour Other Option(s): ● Open turret hatches and turn on turret blower. Option 1: Fabricated clamp repair. Material/Tools: ● Acetylene torch. ● Abestos paper or other suitable fire resistant material. ● Grinder. ● Hexagon head nut, 3/8-inch (as required). ● Lockwashers (as required). ● Machine screws, 3/8-inch (as required). ● Sheet metal, 1/4-inch thick, about 21-inches long and wide enough to overlap damage. Procedural Steps: 1. Use acetylene torch and grinder to cut and remove any burrs or protruding metal edges that may effect air-tight seal. ■ 10-4.2 Change 1