In addition to loading, he swabs the bore after 10 rounds have been fired or after each fire mission. This ensures a maximum traversing and elevating capability after making the movement. All mortar cartridges are painted to prevent rust and to identify their type. These propellants are flash-suppressed and clean burning resulting in minimum residue, flash and blast overpressure. 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. Additional information is included on an ammunition data card inside each container. A spring-loaded locating catch is behind the elevating gear housing, which locates the plain leg in its supporting position for level ground. M821/M889 81mm HE Mortar Cartridges - GlobalSecurity.org The vertical cross line of the sight is on the left edge of the aiming point. Table 4-3. The fuze consists of a brass head, body assembly, and expelling charge. (3) The securing strap is correctly located, securing the barrel clamps and buffers to the plain leg. Secure .mil websites use HTTPS ), FIRING TABLES 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 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, HE, M483A1 (S&I BY PROP SEE DETAILS, FOOTNOTES), 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, M776 ON HOWITZER, MEDIUM, TOWED, 155MM, M777A1 FIRING PROJECTILE, HERA, M549 PROJECTILE, HERA, M549A1 (S&I BY PROP SEE DETAILS, FOOTNOTES), FIRING TABLES 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; HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A3B; HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A4 AND 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, HERA, M549 AND PROJECTILE, HERA, M549A1 (S&I BY PROPONENT, SEE DEAILS, FOOTNOTES. Mortar, 81mm M1 - Military Factory c. The first ammunition bearer ensures that each cartridge is clean, the safety pin is present, and the ignition cartridge is in good condition. Red phosphorus/white phosphorus--M819 and M375-series. Following the arm-and-hand signals of the gunner (who is looking through the sight unit), he moves the far aiming post so that the gunner obtains an aligned sight picture. The body is made of aluminum and brass. This action breaks an internal sheet pin and internal wire, thereby disabling the proximity function. The cartridge weighs about 9.12 pounds. He must not stand directly behind the mortar. If not, he may still fire at the desired range by selecting a charge zone having a higher elevation. 81mm, 82 mm & 120 mm Medium and Heavy Mortars - GICHD A lock ( Cartridges assembled with the M524 (A1, A2, A3, or A4) fuze are for use by the US Marine Corps and US Navy only. e. Care, Handling, and Preservation. Target terrain, such as ice and dry sand, gives lowest burst heights, whereas water and wet ground give highest burst heights. M29, 81mm Mortar - Military Factory If the round does not fire, the gunner tests the barrel for heat. This may cause the firing pin to ignite the charges if the cartridge is dropped on the fin end (. 9301 Chapek Road., Bldg.1458 (2) The M84 fuze is a single-purpose, powder-train, mechanical-time fuze used with the 81-mm M301A1 and M301A2 illuminating cartridges. [1] [2] Many countries use or used an 81 mm mortar in their armed forces. The components of the mortar consist of a cannon, mount, and baseplate. An official website of the United States government. Identification. c. After the gunner has announced, "Up," the squad leader should check the mortar to determine if the exercise was performed correctly. An M18 fuze wrench is used to change settings. The components of the mortar consist of a canon, sight, mount, and baseplate. e. The assistant gunner passes the round to the first ammunition bearer who inspects it for the cause of the misfire. He rotates the socket so that the open end is pointing in the direction of fire. Range Minimum to maximum 83 to 5,608 meters Rate of Fire . The aluminum tail assembly has six integral fins equally spaced around the rear, which stabilize the round in flight. If the fuze does not function as set, it automatically functions at the next lower setting. Figure 4-7. (4) The blast attentuator device is secured correctly. 60mm, 81mm, and 120mm Mortar Increments with Ball Powder Propellants Remaining increments are repositioned towards the rear of the tail fin assembly when firing the cartridge with horseshoe-shaped increments at less than full charge. The types of fuzes described in this paragraph are point detonating, proximity, mechanical time, multioption, and dummy. The squad leader picks up the sight case and the two aiming posts, and moves to the exact position where the mortar is to be mounted. At the same time, the first ammunition bearer moves out on the double to realign the aiming posts. *FREE* shipping on qualifying offers. If the barrel is hot, the gunner may then apply water to the outside of the barrel until it is cool. Table 4-1. Powered by Hugo. If it gets wet or dirty, it must be wiped off at once. The assistant gunner carries the bipod to the front of the barrel and places the bipod feet on the ground 12 to 15 inches in front of the baseplate and astride the line of fire. He ensures that the firing pin recess is facing upwards. 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. Swifty 3 from scratch; Swifty 3 split-repo setup; Swifty Troubleshooting; Mods. 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. PDF IMLC EQUIPMENT SUPPLY LIST - United States Army The fuze is screwed into the cartridge body, and it is seated and secured using an M18 wrench. These cartridges are used first in subsequent firing so that once-opened stocks can be kept to a minimum. c. The moisture-resistant seal of the container is broken when the ammunition is to be used. It can be fitted with either the M567, M524, or M532-series fuzes. 90th IDPG IMA 81mm Mortar Review The gunner unlocks the barrel clamp and rotates the barrel, unlocking the breech plug from the rotating socket of the baseplate. b. The components of the mortar consist of a cannon, mount, and baseplate. While the assistant gunner supports the barrel, the gunner slackens the leg-locking handwheel, releases the locating catch, and positions the plain leg. Joint Tables of Allowance; PB - Professional Bulletins; STP - Soldier Training Publications; TC - Training Circulars; . The gunner should expose 6 inches (150 millimeters) of elevation shaft and center the buffer carrier. (3) The M84A1 fuze is a single-purpose, tungsten-ring, mechanical-time fuze used with the 81-mm M301A3 illumination cartridge. The platoon leader commands the platoon and supervises the training of the elements. This section implements STANAG 2321 and QSTAG 900 (Edition 1). The assistant gunner checks the bipod and ensures that--. 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. f. Ammunition should be stored under cover. b. (c) The gunner determines mask and overhead clearance by sighting along the barrel with his eye near the breech plug. 4-10. a. The fuze should already be fitted to the cartridge. He then checks the sight picture to ensure he is within 20 mils of a proper sight picture. The cartridge is painted olive drab with yellow markings. It comes preset to function on SQ/IMP, and the selector slot should align with the SQ mark on the ogive. The assistant gunner exposes 8 inches (200 millimeters) of elevation shaft, leaving the elevation handwheel unfolded. He performs other duties as the squad leader directs. The round has a burst height of 600 meters and provides illumination for about 60 seconds for an area of about 1,200 meters. e. The gunner centers the elevation bubble. Both the 60mm and 120mm mortar rounds use White Phosphorus. c. Mechanical Time. Firing tables are used to determine the correct charge for firing. (4) Extra increments are removed if the cartridge is to be fired with less than full charge. The M252 system . (703) 614-3727, Office of the Chief Information Officer System (including basic issue items) WP cartridges are stored with the fuze end up. h. Where the ground is uneven and there is no level surface for the bipod, the gunner can adjust the plain leg. c. Upon receiving the command REFER, REALIGN AIMING POST, two actions take place at the same time in the mortar squad. The safety pull wire is removed just before inserting the cartridge into the mortar. Training practice is used only for training. The gunner is given an administrative command to lay the mortar on a deflection of 2860 or 2740 mils. If you look at the table above, you'll see that at 1.5km range, 120mm mortars have nearly 33% more dispersion than 80mm mortars.Try testing 80mm mortars and 120mm mortars at 1.5km against . (4) The bipod locking latch is locked, securing the barrel clamps. The 81-mm mortar, M252, is a smooth-bore, muzzle-loaded, high-angle-of-fire weapon. 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. c. The M374A3 HE cartridge is constructed from pearlitic malleable cast iron and contains about 2.10 pounds of composition B explosive. He places the sight case and aiming posts to the left front of the mortar position. a. He places firing data on the sight and lays the mortar for deflection and elevation. Fuzes are not disassembled. LARGE DEFLECTION AND ELEVATION CHANGES. However, at temperatures above 32 degrees Fahrenheit and at angles greater than 1068 mils, the flight time is sufficient to permit arming. He opens the cross-level handwheel, traversing handwheel, and barrel clamp. More uniform firing is obtained if ammunition is kept at the same temperature. They are painted light green with red markings and one narrow yellow band. e. The pull wire and safety wire are removed from the fuze just before firing. 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. DESCRIPTION. It is fitted with a standard pull wire and safety pin that are removed immediately before firing. The equipment is placed out the same as for the gunner's examination (Chapter 9). They are assembled with either an M524-series, M526-series, or M567 fuze. Each round is stenciled with the ammunition lot number, type of round, type of filler, and caliber. When firing under the control of an FDC, he reports to the FDC that mask clearance cannot be obtained at a certain elevation. When cartridges have been prepared for firing, but are not used, all powder increments and safety wires are replaced. To prepare for firing, the slot is aligned in the striker with SQ or delay using the M18 fuze wrench. Proximity-fuzed short cartridges, which are duds, contain a complete explosive train and impact element. 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 . Long Range PGK. Each squad member should be able to perform all the following premount checks: a. 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. After the mortar is mounted, the gunner makes a thorough check. Red phosphorus/white phosphorus is used for screening, producing casualties, creating incendiary effects, and signaling. b. The squad leader indicates the direction of fire when mounting. The M252 medium mortar offers a compromise between the light and heavy mortars. b. There is a selector on the lower shaft for non-delay or delay impact action. b. This section discusses the. Cartridges assembled with the M532 fuze must be fired above charge 0. Agreed that mortars should generally be used close to the frontline. The ignition cartridge (with primer) is fitted into the base of the fin shaft. The mortar is mounted and the sight is installed. a. Cartridges are shipped with a complete propelling charge, an ignition cartridge, and primer. When fired, the cartridge carries the ignition cartridge with it, leaving the mortar ready for the next cartridge. Several types of RP/WP ammunition are described herein. 60MM M224A1. The M751 fuze is the only dummy fuze used with the 81-mm mortar. (1) Marking on container. The squad leader stands behind the mortar where he can command and control his squad. a. The cartridges are painted olive drab with yellow markings. Tabular Firing Tables TFT ORDER FORM 1.Select "Mortar" 2.Select which mortar caliber 3.Select mortar system nomenclature 4.Select which TFTs to order 5.Put in quantity and click "Add TFTs" 6.Click "Next" TFT JUSTIFICATION 1.Put in TFT Ordering Justification 2.Click "Next" SHIPPING INFORMATION 1.Fill out all required fields The same procedure for aligning the far aiming post is used to align the near aiming post. Placing the mortar in position at night does not relieve the gunner of the responsibility of checking for mask clearance and overhead interference.
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