Prev - Mk6 Mortar range table for charge 0 Next - Mk6 Mortar range table for charge 2 . Then he relocks the barrel clamp. It uses the M205 propelling charge, consisting of four horseshoe-shaped increments fitted around the tail. Additionally, they carry the 81mm M252 mortar that can only be used in a dismounted capacity. They are fuzed with the M524-series, M256-series, or M532. (4) The M567 fuze is an impact fuze that has a SQ/IMP or D function. A proximity fuze is an electronic device that detonates a projectile by means of radio waves sent out from a small radio set in the nose of the projectile. MORTAR RANGE: 500M X 100M X: FIELD TRAINING AREA 40000 Sq Ft: X STORAGE BUILDING, GENERAL PURPOSE, INSTALLATION: Area to store excess equipment X: ORGANIZATIONAL STORAGE BUILDING Arms room for Mortar equipment: X . If it gets wet or dirty, it must be wiped off at once. b. The following safety checks must be enforced before firing the mortar. f. If the above procedure fails to remove the misfire, the barrel must be kept horizontal. VERY NICE condition! (1) Marking on container. Red phosphorus/white phosphorus--M819 and M375-series. e. The gunner centers the elevation bubble. The round has a burst height of 600 meters and provides illumination for about 60 seconds for an area of about 1,200 meters. (1) The M935 fuze has two function settings: impact and delay. The M301A3 cartridge has a cylindrical body that contains an illuminating candle and parachute assembly. Any target that requires that elevation, or a lower one, cannot be engaged from that position. d. The gunner rough levels the cross-level bubble by making the bubble bounce from one side to the other. M252A1 81mm Mortar: Maximum Range (meters): 5,935; Ammunition: War reserve HE (M821A3), red phosphorus smoke (M819), visible light illumination (M853A1), infrared illumination (M816), war reserve and training HE (M889A4), and FRP . It uses the M219 propelling charge and weighs about 9.1 pounds. e. The second ammunition bearer stands to the right rear of the mortar behind the ammunition bearer. Baseplate placed against baseplate stake. The M374A2 and M374A1 cartridges are fitted with the M90A1 propelling charge. Their firing positions and principal duties are as follows: a. The M252 is highly accurate up to ranges of 4500m to 5700m depending on the If the barrel is hot, the gunner may then apply water to the outside of the barrel until it is cool. He tightens the leg-locking handwheel (ensuring the teeth are correctly meshed) and fastens the securing strap over the arm and around the buffers. An official website of the United States government. When the approximate alignment is completed, the gunner signals the assistant gunner to lower the bipod by pushing down on the mortar. There must not be a visible gap between the fuze and cartridge body. a. Each round is stenciled with the ammunition lot number, type of round, type of filler, and caliber. If the barrel is cool enough to handle, the crew removes the round as described below. 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. Powered by Hugo. The American M1 81mm Mortar, like the upcoming M2 60mm Mortar, was based on a French design by Edgar William Brandt (1880-1960). (4) Extra increments are removed if the cartridge is to be fired with less than full charge. When fired, the cartridge carries the ignition cartridge with it, leaving the mortar ready for the next cartridge. On its right side, the clamp is recessed to receive the ball end of the locking rod. e. The assistant gunner passes the round to the first ammunition bearer who inspects it for the cause of the misfire. It contains white phosphorus that produces white smoke on contact with air. Attached to the right of the screw is the traversing handwheel. The M375 cartridge uses the M90 propelling charge while the M375A2 and M375A1 cartridges use the M90A1 propelling charge. He places his thumbs alongside the forefingers, being careful to keep both hands away from the muzzle. The sight bracket is attached to the buffer carrier, which is fitted to the traversing screw assembly. When the fuze of the misfired round reaches the BAD, the assistant gunner stops the round with his thumbs (he does not touch the fuze) and carefully removes it from the barrel. The 60mm mortar section is located in the weapons platoon of the rifle company, is armed with three 60mm mortars, and is (4) The bipod locking latch is locked, securing the barrel clamps. The squad leader indicates the direction of fire when mounting. It has a time setting of up to 25 seconds. The floating firing pin located within the primer has approximately 1/16 of an inch to move around. To set for delay, the selector slot should be rotated clockwise until it is aligned with the "D" mark on the ogive. Share sensitive information only on official, secure websites. c. The gunner grasps both ends of the traverse screw assembly and supports the mortar during the subsequent drill. The gunner unlocks the barrel clamp and rotates the barrel, unlocking the breech plug from the rotating socket of the baseplate. b. The cartridge uses the M205 propelling charge and is assembled with the M567 or M524-series fuze. To prepare for firing, the slot is aligned in the striker with SQ or delay using the M18 fuze wrench. The cannon has a crew-removable breech plug and firing pin. If the mortar section is to operate quickly and effectively in accomplishing its mission, mortar squad members must be proficient in individually assigned duties. a. The cartridge must not be fired below charge 3. The mortar also offered the promised increase in range as well, allowing fire teams to engage the enemy at distance. Correctly applying and performing these duties enables the mortar section to perform as an effective fighting team. (1) Mask clearance and overhead clearance are sufficient. The M1 became the standard American . All elements given in the fire command are repeated by the squad. He levels all bubbles. It weighs about 9.05 pounds. It is fitted with a safety wire and pin that are removed immediately before firing. The fuze body is graduated from 0 to 25 seconds in 1-second intervals; 5-second intervals are indicated by bosses. Ammunition Lot Number. The M821A2/821A1/889A1 consists of the following major components: M935 Point Detonating Fuze or M734/734A1 Multi-Option Fuze. To make the shift, the gunner places the fingers of his right hand in the muzzle and his left hand on the left leg. The M252 81mm mortar is a smooth-bore, muzzle-loaded, high-angle-of-fire weapon. An ammunition lot number is assigned to each ammunition lot, which is marked on each cartridge and packing container. The traversing screw assembly is fitted to the clamp assembly, which is pivoted in the center on an arm attached to the elevating leg. The tabulated data of the 81-mm mortar, M252, are shown in Table 4-1. The mortar should be within two turns of center of traverse when the task is compete. MFCS Dismounted. The pile is covered with a double thickness of tarpaulin. a. Before-firing checks include the following: (1) Ammunition should be free of moisture, rust, and dirt. It comes preset to function on SQ/IMP, and the selector slot should align with the SQ mark on the ogive. c. After the gunner has announced, "Up," the squad leader should check the mortar to determine if the exercise was performed correctly. 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. If water is not available, the gunner must stand clear of the mortar until the barrel is cool. All mortar cartridges are painted to prevent rust and to identify their type. The mortar is within two turns of center of traverse. This is accomplished by depressing the barrel until the top of the mask is clear. The M252 medium mortar offers a compromise between the light and heavy mortars. In charge was the platoon commander - normally a lieutenant. SMALL DEFLECTION AND ELEVATION CHANGES. (1) The rotating socket is free to move in a complete circle. Cartridges assembled with the M532 fuze must be fired above charge 0. The components of the mortar consist of a canon, sight, mount, and baseplate. After the 30-minute waiting period, the dud is still dangerous but can be approached and removed carefully or destroyed in place by qualified disposal personnel. The M532 fuze is a radio doppler fuze that has a proximity (PROX) or SQ/IMP function. Overhead interference can be branches of trees or roofs of buildings. The fuze arms and functions normally when fired at any angle of elevation between 0800 and 1406 mils at charges 1 through 9. c. The elevating shaft is contained in the elevating leg; to the left of the elevating leg is the elevating handwheel. *FREE* shipping on qualifying offers. During training, the gunner may use the driving stake from the aiming post case. MFCS Mounted. The bipod provides front support for the barrel and carries the gears necessary to lay the mortar. The fuze contains a delayed arming feature that ensures the fuze remains unarmed and detonator safe for a minimum of 1.25 seconds of flight. 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. 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 first ammunition bearer holds the barrel until the assistant gunner has removed the mount. Red phosphorus cartridges (M252 only) are stored the same as HE cartridges. TM - Technical Manuals (Range 9) TM - Technical Manuals (Range 10) TM - Technical Manuals (Range 11-4) TM - Technical Manuals (Range 11-5) . (5) Four inches of elevation shaft are exposed, and the shaft is not bent. c. Upon receiving the command REFER, REALIGN AIMING POST, two actions take place at the same time in the mortar squad. The company level vehicles also carry a vehicle-mounted 120mm mortar, which is augmented by the 60mm M224 mortar for dismounted use. 4-11. a. The assistant gunner places his right hand palm up (1 inch from the muzzle end) under the BAD and his left hand palm down (1 inch from the muzzle end) on top. The table on the right describes the three most common setups. The squad leader notifies the FDC of the minimum mask clearance elevation. News. The ammunition that can be fired by the 81-mm mortar, M252, is identified and described herein. The cannon assembly consists of the barrel that is sealed at the lower end with a removable breech plug, which houses a removable firing pin (Figure 4-3). He places the sight case and aiming posts to the left front of the mortar position. The equipment is placed out the same as for the gunner's examination (Chapter 9). With the clamps facing away from him, the assistant gunner traverses the buffer carrier to the traversing handwheel and folds the handle. Fired . e. The M362A1 and M362 HE cartridges are of steel forge construction and contain about 2.10 pounds of composition B explosive. It uses the M185 propelling charge that consists of eight increments fitted into the spaces between the fins and held by a propellant holder. 120mm IHE grenade DM91. (1) The M772A1 fuze is a MTSQ. Increments removed from cartridges before firing should be placed in a metal or wooden container located outside the firing vehicle/position at least 25 meters away. FT 81-AI-3 Firing Tables Mortar, 81mm: M28A1 and M29 Mortar 81mm Self propelled M125A1 and M125 Carrier, 81mm Mortar Tracked XM755 (3) From this train, extend a starting train that will burn against the wind of single increments laid end to end. The cartridge uses the M218 propelling charge, which consists of four horseshoe-shaped increments fitted around the tail. The assistant gunner exposes 8 inches (200 millimeters) of elevation shaft, leaving the elevation handwheel unfolded. Figure 4-4. a. When the gunner is satisfied with his sight picture he announces, "Up.". .50: BROWNING, M2 (HEAVY BARREL, TURRET TYPE) ON MOUNT, MACHINE GUN, TRAILER MTD: MULTIPLE CAL. 0.50, M8 (REPRINTED W/BASIC INCL C1-2) (S&I BY PROP SEE DETAILS, FOOTNOTES), FIRING TABLES FOR MACHINE GUN, CALIBER .50: BROWNING, M2 (HEAVY BARREL, TURRET TYPE) ON MOUNT, MACHINE GUN, TRAILER MOUNTED: MULTIPLE CALIBER .50 MACHINE GUN, M55 FIRING CARTRIDGE, CALIBER .50: API, M8 (S&I BY PROP SEE DETAILS, FOOTNOTES), FIRING TABLES FOR MACHINE GUN, CALIBER .50: FICED, M85 TANK, COMBAT, FULL TRACKED: 105MM GUN, M60 SERIES FIRING CARTRIDGE, CALIBER .50: API, M8 CARTRIDGE, CALIBER .50: API-T M20 CARTRIDGE, CALIBER .50: BALL, M33 CARTRIDGE, CALIBER .50: TRACER, M17 (S&I BY PROP SEE DETAILS, FOOTNOTES), MACHINE GUN, CAL.
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