The wrench (P/N 9349539) sets M772 MT and M768 time fuzes. The lower clamp is shaped and bored on each side to house the buffer cylinders. (2) The M84 fuze is a single-purpose, powder-train, mechanical-time fuze used with the 81-mm M301A1 and M301A2 illuminating cartridges. If the round does not fire, the gunner tests the barrel for heat. The firing pin must be replaced and the bore swabbed. The components of the mortar consist of a cannon, mount, and baseplate. a. As a longstanding partner of armed forces around the globe, Rheinmetall supplies a wide array of mortar systems and ammunition. If water is not available, the gunner must stand clear of the mortar until the barrel is cool. It contains white phosphorus that produces white smoke on contact with air. 4-10. d. The squad leader supervises the squad drill and is responsible for supervising the laying out of the equipment as shown in Figure 4-6. The fuze arms and functions normally when fired at any angle of elevation between 0800 and 1406 mils at charges 1 through 9. The term "indirect fire" means firing at an enemy without having a. (4) The bipod locking latch is locked, securing the barrel clamps. High explosive--M821, M889, M374-series, and M362. The adjustment ring has six raised ribs for use in conjunction with fuze setter, M25, and a setting indicator rib (marked SET) about half the height and width of the other six ribs. This section discusses the. The mortar also offered the promised increase in range as well, allowing fire teams to engage the enemy at distance. M224A1 60 MM LWCMS Mortar The 60mm mortar, M224A1 Lightweight Company Mortar System (LWCMS), is a smoothbore, muzzle loaded, high angle of fire weapon. HE ammunition is used against personnel and materiel. (5) Four inches of elevation shaft are exposed, and the shaft is not bent. VERY NICE condition! The vertical cross line of the sight is on the left edge of the aiming point. It arms within a maximum of 2.50 seconds. d. The ammunition is protected from mud, sand, dirt, and water. The settings are obtained from the range tables and are applied using a wrench (number 9239539) or a 1 3/4-turn open-end wrench. 107 Army Pentagon c. After the gunner has announced, "Up," the squad leader should check the mortar to determine if the exercise was performed correctly. The baseplate (Figure 4-5) is of one-piece construction, and supports and aligns the mortar for firing. All rounds are colored according to their type. Proximity-fuzed short cartridges, which are duds, contain a complete explosive train and impact element. Since phosphorus liquefies at about 100 degrees Fahrenheit, the ammunition is protected against an uneven rehardening of the filler. Safety before firing is provided by a safety wire, which must be removed just before firing. e. Dummy. The components of the mortar consist of a canon, sight, mount, and baseplate. All mortar cartridges are painted to prevent rust and to identify their type. With the mortar mounted and the sight installed, the gunner lays the sight on the two aiming posts (placed out 50 and 100 meters from the mortar) on a referred deflection of 2800 mils and an elevation of 1100 mils. The gunner stands to the left side of the mortar where he can manipulate the sight, elevating handwheel, and traversing handwheel. The fuze body is graduated from 0 to 50 seconds in 2-second intervals; 10-second intervals are indicated by bosses. Correctly applying and performing these duties enables the mortar section to perform as an effective fighting team. (a) Since the mortar is normally mounted in defilade, there could be a mask such as a hill, tree, building, or rise in the ground. The leg-locking handwheel must then be tightened, ensuring the teeth are correctly meshed. The gunner levels the elevation bubble by turning the elevation micrometer knob and reading the setting on the elevation scale and elevation micrometer--this setting is the minimum mask clearance. (6) The primer cartridge is checked for damage or dampness. The mortar is mounted and the sight is installed. He performs other duties as the squad leader directs. The mortar should be within two turns of center of traverse when the task is compete. mortar, 81-mm: m29a1 and m29; firing cartridge, he, m374a2 and m374; cartridge, wp, m375a2 and m375 (s&i by prop see details, footnotes) ardec: ft 81-al-4(abr) active: 12/24/1970: firing tables for mortar, 81mm, m29 and m1 firing cartridge, illuminating, m301a3 with fuze, time, m84a1, height of burst, 600 meters (s&i by prop see details . b. Light tree foliage and light vegetation affect the height of burst only slightly, but dense tree foliage and dense vegetation increase the height of burst. b. Baseplate placed against baseplate stake. .30 BROWNING, M1917 AND M1917A1; GUN, MACHINE, CAL. The mount consists of elevating and traversing mechanisms and a bipod (Figure 4-4). Ammunition Lot Number. Burst Height. The first ammunition bearer puts both hands on the cooling fins under the barrel and slowly lifts the barrel until it is horizontal. To set for delay, the selector slot should be rotated clockwise until it is aligned with the "D" mark on the ogive. He exposes 4 inches (100 millimeters) of elevation shaft and folds the handle. The cartridge can be fitted with the M524-series, M526-series, M567, or M532 fuzes. It has a time setting of up to 50 seconds. Close approach to crests, trees, towers, large buildings, parked aircraft, mechanized equipment, and similar irregularities causes functioning at heights greater than average level. (5) Do not leave unused increments unburned in combat operational areas. c. The moisture-resistant seal of the container is broken when the ammunition is to be used. The striker has been modified to be able to use German and Italian patterns of 81mm mortar . The 60mm mortar section is located in the weapons platoon of the rifle company, is armed with three 60mm mortars, and is The 81mm weapons platoon consisted of the headquarters platoon and four mortar squads. . During firing, the breech plug on the barrel is sealed and locked to the rotatable socket in the baseplate. b. 81 mm HE mortar projectiles generally contain anywhere between 400 g and 680 g of HE and have a maximum range of approximately 6,500 m. 82 mm HE mortar projectiles generally contain anywhere between 392 g and 680 g of HE and have maximum ranges of between 3,000 - 5,500 m. (3) From this train, extend a starting train that will burn against the wind of single increments laid end to end. It uses the M772 mechanical time fuze and weighs about 10.6 pounds. When the baseplate is in position, the first ammunition bearer lowers the breech plug into the rotating socket and rotates the barrel a quarter of a turn to lock it. 81mm smoothbore mortar Barrel length 1.28 m Muzzle velocity 225 m/s Elevation +45 to +85 Traverse 18 Fire control Sights C2 indirect fire sight with illumination Firepower Rate of fire 20 rpm maximum 15 rpm normal 1 to 12 rpm sustained Range 5.650 m maximum 100 m minimum Media 81mm L16A2 The fuze threads and fuze well threads are inspected for damage. He tightens the leg-locking handwheel (ensuring the teeth are correctly meshed) and fastens the securing strap over the arm and around the buffers. d. The gunner rough levels the cross-level bubble by making the bubble bounce from one side to the other. The M821 HE cartridge (M252 only) is a British-made cartridge fitted with the US M734 multioption fuze. c. The assistant gunner disengages the barrel clamps and moves the bipod from the immediate area of the mortar position. The safety pull wire is removed just before inserting the cartridge into the mortar. Placing the mortar in position at night does not relieve the gunner of the responsibility of checking for mask clearance and overhead interference. b. Tabulated data. The gunner unlocks the barrel clamp and rotates the barrel, unlocking the breech plug from the rotating socket of the baseplate. e. The assistant gunner passes the round to the first ammunition bearer who inspects it for the cause of the misfire. However, at temperatures above 32 degrees Fahrenheit and at angles greater than 1068 mils, the flight time is sufficient to permit arming. on Amazon.com. The fuze has a safety wire that must be removed before firing. Mount The cartridge weighs about 9.12 pounds. M120/M121 120 mm Mortar. Section I. The ignition cartridge has a percussion primer and is assembled to the end of the fin assembly. LARGE DEFLECTION AND ELEVATION CHANGES. Check the post SOP before applying the following procedure: (1) Select a place at least 100 meters from the mortar position, parked vehicles, and ammunition piles. f. Installation. a. Excess increments should not accumulate near the mortar positions but are removed to a designated place of burning and destroyed. The propellant increments are ignited, which produce rapidly expanding gases that force the cartridge from the barrel. It is especially useful if the baseplate sinks deep into the ground during prolonged firing. When cartridges have been prepared for firing, but are not used, all powder increments and safety wires are replaced. If, upon removal of the safety wire, a buzzing sound in the fuze is heard, the round should not be used. c. The assistant gunner stands to the right of the mortar, facing the barrel and ready to load. If the line of sight clears the mask, it is safe to fire. Figure 4-4. Complete cartridges are always handled with care. While the assistant gunner supports the barrel, the gunner slackens the leg-locking handwheel, releases the locating catch, and positions the plain leg. The M301A3 cartridge has a cylindrical body that contains an illuminating candle and parachute assembly. a. The components of the mortar consist of a cannon, mount, and baseplate. The gunner places the outer edge of the baseplate against the baseplate stake so that the left edge of the cutaway portion of the baseplate is aligned with the right edge of the stake (Figure 4-7). M64A1 Sightunit. The floating firing pin located within the primer has approximately 1/16 of an inch to move around. In addition to supervising the emplacement, laying, and firing of the mortar, he supervises all other squad activities. Their firing positions and principal duties are as follows: a. FIRING TABLE FOR CANNON, 155MM HOWITZER, M185 ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A1; HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A1B; HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A2; HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A3; AND HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A3B; AND CANNON, 155MM HOWITZER, M284 ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A5 AND HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A6 AND CANNON, 155MM HOWITZER, M199 ON HOWITZER, MEDIUM, TOWED, 155MM, M198 FIRING PROJECTILE, GUIDED, M712 (COPPERHEAD) WITH SHAPED TRAJECTORIES (S&I BY PROP SEE DETAILS, FOOTNOTES), PROVISIONAL AIMING DATA FOR CANNON, 155MM, HOWITZER, M185 ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, 109A1 HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, 109A1B HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A2 AND HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A3 HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A3B AND HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A4 AND CANNON, 155MM HOWITZER, M284 ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A5 AND HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A6 AND CANNON, 155MM HOWITZER, M199 ON HOWITZER, MEDIUM, TOWED, 155MM, M198 AND CANNON, 155MM HOWITZER, M776 ON HOWITZER, MEDIUM, TOWED, 155MM, M777A1 FIRING PROJECTILE, BASE-BURN, M864 AND M864A1 (S&I BY PROP SEE DETAILS, FOOTNOTES), PRELIMINARY AIMING DATA FOR CANNON, 155MM HOWITZER, M284 ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A6 AND CANNON, 155MM HOWITZER, M776 ON HOWITZER, MEDIUM, TOWED, 155MM, M777A2 FIRING PROJECTILE, HE, XM982 (S&I BY PROP SEE DETAILS, FOOTNOTES), PROVISIONAL AIMING DATA FOR CANNON, 155MM HOWITZER, M284 ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A6 AND CANNON, 155MM HOWITZER, M776 ON HOWITZER, MEDIUM, TOWED, 155MM, M777A2 FIRING PROJECTILE, HE, XM982 (S&I BY PROP SEE DETAILS, FOOTNOTES), PROVISIONAL AIMING DATA FOR CANNON, 155MM HOWITZER, M284 ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A6 AND CANNON, 155MM HOWITZER, M776 ON HOWITZER, MEDIUM, TOWED, 155MM, M777A2 FIRING PROJECTILE, HE, M982 (S&I BY PROP SEE DETAILS, FOOTNOTES), CANNON, 165-MM GUN, M135 ON COMBAT ENGINEER VEHICLE, FULL TRACKED, M728; FIRING CARTRIDGE, 165-MM, HEP, M123A1 AND 165-MM, TP-T, XM623 (S&I BY PROP SEE DETAILS, FOOTNOTES), CANNON, 175-MM GUN, M113 AND M113A1 ON GUN, FIELD ARTILLERY, SELF-PROPELLED: 175-MM, M107; FIRING PROJECTILE, HE, M437A2 AND M437A1 (S&I BY PROP SEE DETAILS, FOOTNOTES), RAPID FIRE TABLES FOR CALCULATION OF THE EXECUTIVE OFFICERS (XOS) MINIMUM QUADRANT ELEVATION WITH CANNON, 105MM HOWITZER, M20A1 ON HOWITZER, LIGHT, TOWED, 105MM, M119A1; HOWITZER, LIGHT, TOWED, 105MM, M119A2; HOWITZER, LIGHT, TOWED, 105MM, M119A3 FIRING WITH PROPELLING CHARGES, M67 AND M200 (S&I BY PROP SEE DETAILS, FOOTNOTES), RAPID FIRE TABLES FOR CALCULATION OF THE EXECUTIVE OFFICER S (XO S) MINIMUM QUADRANT ELEVATION WITH CANNON, 155MM HOWITZER, M284 ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A5/A6 AND CANNON, 155MM HOWITZER, M199 ON HOWITZER, MEDIUM, TOWED, 155MM, M198 AND CANNON, 155MM HOWITZER, M776 ON HOWITZER, MEDIUM, TOWED, 155MM, M777A1/A2 FIRING WITH PROPELLING CHARGES, M231, M232, AND M232A1 (S&I BY PROP SEE DETAILS, FOOTNOTES), RAPID FIRE TABLES FOR CALCULATION OF THE EXECUTIVE OFFICERS (XOS) MINIMUM QUADRANT ELEVATION WITH CANNON, 155MM HOWITZER, M284 ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A5; HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A6; AND HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A7, AND CANNON, 155MM HOWITZER, M776 ON HOWITZER, MEDIUM, TOWED, 155MM, M777A1 AND HOWITZER, MEDIUM, TOWED, 155MM, M777A2 FIRING WITH PROPELLING CHARGES, M231, M232, AND M232A1 (S&I BY PROPONENT, SEE DETAILS, FOOTNOTES), ADDENDUM TO FTR LANCE-B-1 FOR WARHEAD SECTION, GUIDED MISSILE, HE: M251 (U) (S&I BY PROP SEE DETAILS, FOOTNOTES), Search Army publications and forms by Number, Title, or Record Detail.
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