Those cartridges assembled with the M524 (A1, A2, A3, or A4) fuze are for use by the US Marine Corps and US Navy only. If water is not available, the gunner must stand clear of the mortar until the barrel is cool. WP cartridges are stored with the fuze end up. MFCS Dismounted. He levels all bubbles. If the barrel is cool enough to handle, the crew removes the round as described below. b. The baseplate (Figure 4-5) is of one-piece construction, and supports and aligns the mortar for firing. LHMBC. To dismount the mortar, the squad leader commands, OUT OF ACTION. REFER DEFLECTION TWO EIGHT SEVEN FIVE (2875), REALIGN AIMING POSTS. 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. He exposes 4 inches (100 millimeters) of elevation shaft and folds the handle. Prev - Mk6 Mortar range table for charge 0 Next - Mk6 Mortar range table for charge 2 . The types of fuzes described in this paragraph are point detonating, proximity, mechanical time, multioption, and dummy. REFERRING OF THE SIGHT AND REALIGNMENT OF AIMING POSTS USING M64 SIGHT. The powder increments, mainly, should not be exposed to direct sunlight. Cartridges assembled with the M532 fuze must be fired above charge 0. high-explosive bomb at a range of about three miles. Barrel (with blast attenuator device) This may cause the firing pin to ignite the charges if the cartridge is dropped on the fin end (. b. He may assist the gunner in shifting the mortar when the gunner is making large deflection changes. e. The squad leader picks up the aiming posts and sight. d. Multioption. (e) If the mask is not regular throughout the sector of fire, the gunner determines the minimum mask clearance as described above. .50: BROWNING, M2 (HEAVY BARREL, FLEXIBLE) ON MOUNT, MACHINE GUN, TRIPOD MTD, CAL. The cartridge uses the M205 propelling charge and is assembled with the M567 or M524-series fuze. (4) The leg-locking handwheel is hand tight. Examples are: Close approach to crests, trees, towers, large buildings, parked aircraft, mechanized equipment, and similar irregularities causes functioning at heights greater than average level. Types of rounds, classification, and characteristics for the 81-mm mortar, M252. 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. The fuze consists of a brass head, body assembly, and expelling charge. f. If the above procedure fails to remove the misfire, the barrel must be kept horizontal. The components of the mortar consist of a cannon, mount, and baseplate. The gunner places the announced deflection on the sight (without disturbing the lay of the weapon) and looks through the sightunit. It is constructed from ductile cast iron and contains about 1.5 pounds of cyclonite (RDX)/trinitrotoluene (TNT) composition explosive. The M252 is highly accurate up to ranges of 4500m to 5700m depending on the 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). DESCRIPTION. b. 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 barrel clamps are then closed. They should not be approached for 5 minutes or disturbed for at least 30 minutes after firing. Ammunition Lot Number. 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. The increments are individually wrapped with waterproof bags that are not removed. The fuze threads and fuze well threads are inspected for damage. Safety before firing is provided by a safety wire, which must be removed just before firing. CANNON . The fuze arms and functions normally when fired at any angle of elevation between 0800 and 1406 mils at charges 1 through 9. 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 obturating ring ensures equal muzzle velocities in hot or cold barrels by keeping all the gases in the barrel until the cartridge has fired. It has no safety pins or wires to reduce preparation time. Since phosphorus liquefies at about 100 degrees Fahrenheit, the ammunition is protected against an uneven rehardening of the filler. That is generally how I use mortars. It is designed to be fired in the indirect fire mode, cannot be fired handheld, and normally utilizes a FDC. The M374A2 and M374A1 cartridges are fitted with the M90A1 propelling charge. He then checks the sight picture to ensure he is within 20 mils of a proper sight picture. (1) The rotating socket is free to move in a complete circle. M120/M121 120 mm Mortar. c. The assistant gunner stands to the right of the mortar, facing the barrel and ready to load. The fuze should already be fitted to the cartridge. (2) The barrel is locked to the baseplate, and the open end of the socket points in the direction of fire. Short cartridges can be expected when firing below charge 4. The platoon leader commands the platoon and supervises the training of the elements. (3) The M84A1 fuze is a single-purpose, tungsten-ring, mechanical-time fuze used with the 81-mm M301A3 illumination cartridge. The propellant train (except the training cartridge) consists of an ignition cartridge and propellant charges. Target terrain, such as ice and dry sand, gives lowest burst heights, whereas water and wet ground give highest burst heights. M224A1 60 MM LWCMS Mortar The 60mm mortar, M224A1 Lightweight Company Mortar System (LWCMS), is a smoothbore, muzzle loaded, high angle of fire weapon. These fuzes use a clockwork mechanism to delay functioning for a specific time. 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 . 60mm, 81mm, and 120mmMortar Increments. 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. It is fitted with a standard pull wire and safety pin that are removed immediately before firing. 120mm IHE grenade DM91. (4) The M567 fuze is an impact fuze that has a SQ/IMP or D function. An official website of the United States government. He lays for deflection, taking the proper sight picture. The RSTA squadron only receives the 120mm mounted mortar, there is no augmentation dismounted maneuvers. The cartridge is painted light green and has red markings and one narrow yellow band. All rounds are colored according to their type. Powered by Hugo. . He releases the securing strap, loosens the leg-locking handwheel, and lowers the plain leg until the locating catch engages in the recess. It uses the M205 propelling charge, consisting of four horseshoe-shaped increments fitted around the tail. See Chapter 3, paragraph 3-14 for a detailed discussion of malfunctions. 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. 81MM M252A1. 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 Fort Belvoir, VA 22060 In addition to loading, he swabs the bore after 10 rounds have been fired or after each fire mission. b. Figure 4-8. b. a. The floating firing pin located within the primer has approximately 1/16 of an inch to move around. All PD fuzes are superquick--detonate on impact. If the barrel is hot, the gunner may then apply water to the outside of the barrel until it is cool. TM - Technical Manuals (Range 9) TM - Technical Manuals (Range 10) TM - Technical Manuals (Range 11-4) TM - Technical Manuals (Range 11-5) . Both the M90 and M90A1 propellants are in nine wax-tested, cotton cloth, bag increments assembled to the tail unit. c. The first ammunition bearer ensures that each cartridge is clean, the safety pin is present, and the ignition cartridge is in good condition. The M819 cartridge (M252 only) has a cylindrical body and contains red phosphorus that produces white smoke on contact with air. (5) Four inches of elevation shaft are exposed, and the shaft is not bent. 81-mm MORTAR, M252 The 81-mm mortar, M252, delivers timely, accurate fires to meet the . b. a. Before-firing checks include the following: (1) Ammunition should be free of moisture, rust, and dirt. The M301A3 cartridge has a cylindrical body that contains an illuminating candle and parachute assembly. 4-4. Features: The M252 81mm Medium Extended Range Mortar is a crew-served, medium weight mortar which is highly accurate and provides for a greater range (4,500 meters to 5,650 meters) and lethality than the previous 81mm mortar. (b) In selecting the exact mortar position, the leader looks quickly for mask clearance and overhead interference. Firing tables are used to determine the correct charge for firing. They use the M5 propelling charge that consists of eight cloth bags attached to the tail unit. The gunner should expose 6 inches (150 millimeters) of elevation shaft and center the buffer carrier. 0.30, BROWNING, M1919A4, M1919A5 AND M1919A6 {TO 39A-5 AF-32} (S&I BY PROP SEE DETAILS, FOOTNOTES), GUN, MACHINE, CAL. The M252 medium mortar offers a compromise between the light and heavy mortars. e. The assistant gunner passes the round to the first ammunition bearer who inspects it for the cause of the misfire. MC Medical Guide; Client-side mods; TFAR 1.x for players; Trenches are dug to prevent water from flowing under the pile. Attached to the arm is the cross-leveling mechanism, which is attached to the clamp assembly at its upper end. I have included my order history, detailed photos, as well as my personal opinion on International Military Antiques, IMA -USA www.ima-usa.com 81mm Display Mortar that they have for sale. The fuze has a safety wire that must be removed before firing. It engages the 1 3/4-inch flats on the setting ring or the fuze head. The first ammunition bearer puts both hands on the cooling fins under the barrel and slowly lifts the barrel until it is horizontal. 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. This section implements STANAG 2321 and QSTAG 900 (Edition 1). The fuze body is graduated from 0 to 50 seconds in 2-second intervals; 10-second intervals are indicated by bosses. The tabulated data of the 81-mm mortar, M252, are shown in Table 4-1. Overhead interference can be branches of trees or roofs of buildings. He exposes 1 inch (25 millimeters) of cross-level shaft and folds the handle. With standard mortar, the maximum effective range is close to 4,000 metres; with a long-range system, this increases to nearly 4,500 metres. The upper clamp is fitted with a locking arrangement that consists of a curved handle and a spring-loaded locking rod, which is ball-shaped at its lower end. g. The barrel clamps can be moved along the barrel to counter large changes in elevation. Before the mortar is mounted, the squad must perform premount checks. They are fuzed with the M524-series, M256-series, or M532. M3A1 Baseplate .30 BROWNING, M1917 AND M1917A1; GUN, MACHINE, CAL. The leg-locking handwheel must then be tightened by hand, ensuring the teeth on either side are correctly meshed. (8) To help minimize the occurrence of short rounds and or duds, unpackaged ammunition that has been dropped should not be fired. The leg-locking handwheel must then be tightened, ensuring the teeth are correctly meshed. 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 M853 and M301A3 illuminating ammunition are described herein. b. When cartridges have been prepared for firing, but are not used, all powder increments and safety wires are replaced. (2) The fin and fuze assembly must be checked for tightness and damage. f. The open end of the socket must continue to point in the direction of fire. System (including basic issue items) An air cavity can form on one side of a cartridge to unbalance it, causing instability in flight. M327 mortar is an extended range mortar system operated by Marine Corps Artillery Units. . In the U.S. Army and U.S. Marine Corps, it is normally deployed in the mortar platoon of an infantry battalion. The assistant gunner checks the bipod and ensures that--. 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 . Mount These are NDI items . on Amazon.com. The gunner is given a deflection and elevation change in a fire command causing the gunner to shift the mortar between 200 and 300 mils for deflection and between 100 and 200 for elevation. h. Where the ground is uneven and there is no level surface for the bipod, the gunner can adjust the plain leg. e. The gunner centers the elevation bubble. 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. Illuminating is used for battlefield illumination and signaling. The assistant gunner exposes 8 inches (200 millimeters) of elevation shaft, leaving the elevation handwheel unfolded. (1) The M935 fuze has two function settings: impact and delay. The enemy will use them. On its right side, the clamp is recessed to receive the ball end of the locking rod. 60MM M224A1. Long Range PGK. It has two types: type 1 resembles the M734 fuze, and type 2 resembles the M935 fuze.
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