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The floating firing pin located within the primer has approximately 1/16 of an inch to move around. WP cartridges are stored with the fuze end up. He must not stand directly behind the mortar. d. The gunner removes the sight from its case, mounts it on the mortar, and sets a deflection of 3200 mils and an elevation of 1100 mils. M64A1 Sightunit. b. The M252 81mm medium extended range mortar (see diagram below) is a crew-served, smooth bore, muzzle loaded, high angle of fire weapon system. At extreme temperatures (below -40 degrees Fahrenheit and above 125 degrees Fahrenheit), it is not unusual to experience an increase in malfunctions proportionate to the severity of conditions. It is used for records such as reports on condition, malfunctions, and accidents. The M821/M889 are 81mm HE Mortar Cartridges. Share sensitive information only on official, secure websites. The mortar is within two turns of center of traverse. To dismount the mortar, the squad leader commands, OUT OF ACTION. The section leader, acting as FDC, has one deflection instead of two or more. Correct way to open an ammunition box. (3) From this train, extend a starting train that will burn against the wind of single increments laid end to end. a. The assistant gunner attempts to maintain the traversing mechanism on a horizontal plane. Correctly applying and performing these duties enables the mortar section to perform as an effective fighting team. After the barrel cools, the gunner removes the sight and firing pin. System (including basic issue items) The components of the mortar consist of a cannon, mount, and baseplate. This may cause the firing pin to ignite the charges if the cartridge is dropped on the fin end (. The standard infantry support weapon is the M-252 81mm mortar, which lobs a 10 lb. Target terrain, such as ice and dry sand, gives lowest burst heights, whereas water and wet ground give highest burst heights. The 0-second boss is wider and differs in shape from the other body bosses; the safe setting position is indicated by the letter "S" on the fuze body. The propellant increments are ignited, which produce rapidly expanding gases that force the cartridge from the barrel. Then he relocks the barrel clamp. The round is still safe to handle and transport if the safety wire is reinserted. He ensures that the firing pin recess is facing upwards. The squad leader stands behind the mortar where he can command and control his squad. b. The assistant gunner checks the bipod and ensures that--. The barrel is then rotated a quarter turn to unlock it from the socket, and it is placed in an area designated by the squad leader. c. The assistant gunner lifts the bipod and stands it on its elevating leg so that the elevating handwheel is to the rear and the plain leg is to the front. End this starting train with not less than 1 meter of inert material (dry grass, leaves, or newspapers). A safety latch located at the side of the recess is used to secure the ball. The obturating ring ensures equal muzzle velocities in hot or cold barrels by keeping all the gases in the barrel until the cartridge has fired. The cannon has a crew-removable breech plug and firing pin. Red phosphorus/white phosphorus is used for screening, producing casualties, creating incendiary effects, and signaling. e. The gunner centers the elevation bubble. (2) Burn all dead grass or brush within 30 meters around the burning place. The BAD is removed only by qualified maintenance personnel. The tabulated data of the 81-mm mortar, M252, are shown in Table 4-1. Each round is stenciled with the ammunition lot number, type of round, type of filler, and caliber. (4) The bipod locking latch is locked, securing the barrel clamps. It was even a tool used by airborne units, and was dropped in parachute bundles during Operations Neptune, Market Garden, and Varsity. 4-4. .50: BROWNING, M2 (HEAVY BARREL, FLEXIBLE) ON MOUNT, MACHINE GUN, TRIPOD MTD, CAL. The cartridge is painted olive drab with yellow markings and weighs about 9.05 pounds. Designed by Thingsym. a. As soon as the sight data are announced, the gunner places it on the sight. It contains white phosphorus that produces white smoke on contact with air. See Chapter 3, paragraph 3-14 for a detailed discussion of malfunctions. The gunner places the announced deflection on the sight (without disturbing the lay of the weapon) and looks through the sightunit. This section discusses the. The mount consists of elevating and traversing mechanisms and a bipod (Figure 4-4). f. The open end of the socket must continue to point in the direction of fire. It can be fitted with either the M567, M524, or M532-series fuzes. Long Range PGK. M252 81mm Mortars The M252 81mm medium extended range mortar (see diagram below) is a crew-served, smooth bore, muzzle loaded, high angle of fire weapon system. TM - Technical Manuals (Range 9) TM - Technical Manuals (Range 10) TM - Technical Manuals (Range 11-4) TM - Technical Manuals (Range 11-5) . 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 High explosive is used for both fragmentation and blast effect against personnel and light-skinned vehicles. Table 4-3. They are assembled with either an M524-series, M526-series, or M567 fuze. The M734 multioption fuze is the only one used with the 81-mm mortar. The leg-locking handwheel must then be tightened by hand, ensuring the teeth on either side are correctly meshed. Safety before firing is provided by a safety wire, which must be removed just before firing. h. Where the ground is uneven and there is no level surface for the bipod, the gunner can adjust the plain leg. The cartridge can be fitted with the M524-series, M526-series, M567, or M532 fuzes. Cartridges assembled with the M524 (A1, A2, A3, or A4) fuze are for use by the US Marine Corps and US Navy only. Several types of RP/WP ammunition are described herein. a. Point-Detonating. . For those of you in the market for a Dummy/Display 81mm mortar, I hope this article can answer a few of your questions before you order. If he is not within 20 mils, the gunner and assistant gunner must make another large shift before moving on. All elements given in the fire command are repeated by the squad. Barrel (with blast attenuator device) Safety before firing is provided by a safety wire, which must be removed just before firing. (4) The leg-locking handwheel is hand tight. The safety/packing clip should be removed when the cartridge is unpacked. The M252 81 mm medium weight mortar is a British-designed smooth bore, muzzle-loading, high-angle-of-fire weapon used for long-range indirect fire support to light infantry, air assault, and airborne units across the entire front of a battalion zone of influence. General Dynamics Ordnance and Tactical Systems is the leading manufacturer of propellants for 60mm, 81mm and 120mm Mortar Systems. Proximity-fuzed short cartridges, which are duds, contain a complete explosive train and impact element. It uses the M185 propelling charge that consists of eight increments fitted into the spaces between the fins and held by a propellant holder. The safety wire must be removed before firing. It engages the 1 3/4-inch flats on the setting ring or the fuze head. When the gunner is satisfied with his sight picture he announces, "Up.". Burst Height. It uses the M772 mechanical time fuze and weighs about 10.6 pounds. He moves the mortar until the vertical line of the sight is aligned approximately on the aiming post. M224A1 60 MM LWCMS Mortar The 60mm mortar, M224A1 Lightweight Company Mortar System (LWCMS), is a smoothbore, muzzle loaded, high angle of fire weapon. The fuze consists of a brass head, body assembly, and expelling charge. He places his thumbs alongside the forefingers, being careful to keep both hands away from the muzzle. Attached to the arm is the cross-leveling mechanism, which is attached to the clamp assembly at its upper end. The following are authorized (Standard B) cartridges for the 81-mm mortar, M252: Each cartridge has fins around the tail to stabilize it in flight and to cause it to strike fuze-end first. The equipment is placed out the same as for the gunner's examination (Chapter 9). From introduction up to halfway World War 2 the ML 3-inch had a poor range of up to 1.45 km. b. ), FIRING TABLES FOR, CANNON, 155MM, HOWITZER, M185 ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, 109A1 HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, 109A1B HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A2 HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A3 HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A3B AND HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, 109A4 AND CANNON, 155MM, HOWITZER, M284 ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, 109A5 AND HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, 109A6 AND CANNON, 155MM, HOWITZER, M199 ON HOWITZER, MEDIUM, TOWED, 155MM, M198 AND CANNON, 155MM, HOWITZER, XM776 ON HOWITZER, MEDIUM, TOWED, 155MM, XM777 FIRING PROJECTILE, HE, M795 (S&I BY PROP SEE DETAILS, FOOTNOTES), FIRING TABLES FOR CANNON, 155MM HOWITZER, M284 ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A5, M109A6 AND M109A7 AND CANNON, 155MM HOWITZER, M284A2 CHROME ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A6 AND M109A7 AND CANNON, 155MM HOWITZER, M199 ON HOWITZER, MEDIUM, TOWED, 155MM, M198 AND CANNON, 155MM HOWITZER, M776 ON HOWITZER, MEDIUM, TOWED, 155MM, M777, M777A1 AND M777A2 AND CANNON, 155MM HOWITZER, M776 CHROME ON HOWITZER, MEDIUM, TOWED, 155MM, M777A2 FIRING PROJECTILE, SMOKE, WP, M1121 INCLUDES FIRING TABLES FOR PROPELLANTS: M119A2 (CHARGE 7R), M203A1 (CHARGE 8S), AND MODULAR ARTILLERY CHARGE SYSTEM (MACS) PROPELLANTS: M231 (CHARGES 1L AND 2L), M232 AND M232A1 (CHARGES 3H, 4H AND 5H) (S&I BY PROP SEE FOOTNOTES). High angles of approach (near vertical) give the lowest burst heights. c. The M374A3 HE cartridge is constructed from pearlitic malleable cast iron and contains about 2.10 pounds of composition B explosive. The mortar is then re-laid on the aiming posts using the traversing crank. The fuzes may be used for day or night operations. The sight is laid on 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. How the RCGM works: Target coordinates are programed into the RCGM using a portable GPS setter. 9301 Chapek Road., Bldg.1458 This action breaks an internal sheet pin and internal wire, thereby disabling the proximity function. 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. Fuzes are not disassembled. The barrel clamps are then closed. It has a time setting of up to 25 seconds. If the barrel is cool enough to handle, the crew removes the round as described below. c. Mechanical Time. Bear in mind that these are my personal opinions, experiences, and . HE Guided Mortar is in development. . Before the mortar is mounted, the squad must perform premount checks. To set for delay, the selector slot should be rotated clockwise until it is aligned with the "D" mark on the ogive. The M853 cartridge (M252 only) has a cylindrical body that contains an illuminating candle and parachute assembly. 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). c. Crest Clearance. The gunner is given a deflection change between 5 and 25 mils, either increasing or decreasing from the last stated deflection, and the command to refer and realign aiming posts. e. Dummy. This section implements STANAG 2321 and QSTAG 900 (Edition 1). The cartridge is painted olive drab with yellow markings. It has two types: type 1 resembles the M734 fuze, and type 2 resembles the M935 fuze. (3) Markings on rounds. Complete cartridges are always handled with care. It is designed to be fired in the indirect fire mode, cannot be fired handheld, and norm ally utilizes a FDC. This cartridge is ballistically matched to the M374A2, M374A1, and M375 HE cartridges, and weighs about 9.12 pounds. The M532 fuze is a radio doppler fuze that has a proximity (PROX) or SQ/IMP function. (1) The barrel is clean and free from grease and oil both inside and out. Trenches are dug to prevent water from flowing under the pile. (1) Marking on container. He releases the securing strap, loosens the leg-locking handwheel, and lowers the plain leg until the locating catch engages in the recess.