He lays for deflection, taking the proper sight picture. The M375A3 cartridge is ballistically similar to the M374A3 (HE) cartridge. It can be set from 3 to 55 seconds at half-second intervals. The cartridge uses the M218 propelling charge, which consists of four horseshoe-shaped increments fitted around the tail. The cartridge is painted olive drab with yellow markings. An ammunition lot number is assigned to each ammunition lot, which is marked on each cartridge and packing container. The fuze has a safety wire that must be removed before firing. Figure 4-7. He exposes 4 inches (100 millimeters) of elevation shaft and folds the handle. 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. LARGE DEFLECTION AND ELEVATION CHANGES. LHMBC. b. e. The pull wire and safety wire are removed from the fuze just before firing. The leg-locking handwheel must then be tightened, ensuring the teeth are correctly meshed. 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. More uniform firing is obtained if ammunition is kept at the same temperature. 81mm 120mm 60mm . A securing strap is attached to the plain leg for securing the bipod in the folded position. Army Publishing Directorate Placing the mortar in position at night does not relieve the gunner of the responsibility of checking for mask clearance and overhead interference. 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. 9301 Chapek Road., Bldg.1458 SMALL DEFLECTION AND ELEVATION CHANGES. This may preclude moving the bipod. Finally, the assistant gunner loosens the leg-locking handwheel, presses the spring-loaded locating catch, and raises the plain leg behind the buffer cylinders until it touches the traversing handwheel. The pile is covered with a double thickness of tarpaulin. The ignition cartridge has a percussion primer and is assembled to the end of the fin assembly. Excess increments should not accumulate near the mortar positions but are removed to a designated place of burning and destroyed. The components of the mortar consist of a canon, sight, mount, and baseplate. M224A1 60 MM LWCMS Mortar The 60mm mortar, M224A1 Lightweight Company Mortar System (LWCMS), is a smoothbore, muzzle loaded, high angle of fire weapon. It has a time setting of up to 50 seconds. The M821 HE cartridge (M252 only) is a British-made cartridge fitted with the US M734 multioption fuze. The M532 fuze is a radio doppler fuze that has a proximity (PROX) or SQ/IMP function. He indicates the initial direction of fire by pointing in that direction and commands ACTION. It weighs about 9.05 pounds. The propellant train (except the training cartridge) consists of an ignition cartridge and propellant charges. 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. c. After the gunner has announced, "Up," the squad leader should check the mortar to determine if the exercise was performed correctly. 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 . 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. The fuze wrench, M18, assembles the fuze to the cartridge, and the bladed tip on the end sets PD-type fuzes. 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. He exposes 1 inch (25 millimeters) of cross-level shaft and folds the handle. Table 4-2. Each squad member should be able to perform all the following premount checks: a. (2) The ribs and braces have no breaks, cracks, or dents. Additional information is included on an ammunition data card inside each container. It is fitted with a standard pull wire and safety pin that are removed immediately before firing. The components of the mortar consist of a cannon, mount, and baseplate. The first table is a chart that shows range and elevation for firing particular mortar shells. These propellants are flash-suppressed and clean burning resulting in minimum residue, flash and blast overpressure. HE ammunition is used against personnel and materiel. He then checks the sight picture to ensure he is within 20 mils of a proper sight picture. He positions the lower barrel clamp against the lower stop band on the barrel and secures the upper barrel clamp. When the approximate alignment is completed, the gunner signals the assistant gunner to lower the bipod by pushing down on the mortar. The mortar squad consists of five men (Figure 4-1). b. If it is necessary to leave the ammunition uncovered, it should be raised on dunnage at least 6 inches above the ground. Tabulated data. While the assistant gunner supports the barrel, the gunner slackens the leg-locking handwheel, releases the locating catch, and positions the plain leg. It provides illumination for about 60 seconds with 600,000 candlepower illumination. Since phosphorus liquefies at about 100 degrees Fahrenheit, the ammunition is protected against an uneven rehardening of the filler. They use the M5 propelling charge that consists of eight cloth bags attached to the tail unit. The safety/packing clip should be removed when the cartridge is unpacked. .50: BALL, M2 (S&I BY PROP SEE DETAILS, FOOTNOTES), FIRING TABLES FOR WEAPON, 5.56MM, M16A1 WEAPON, 5.56MM, M16A2 WEAPON, 5.56MM, M249 AND WEAPON, 5.56MM, M4 FIRING CARTRIDGE, BALL, M855 CARTRIDGE, TRACER, M858 CARTRIDGE, BALL, M193 CARTRIDGE, TRACER, M196 (S&I BY PROP SEE DETAILS, FOOTNOTES), MACHINE GUN, 7.62-MM: M60 ON MOUNT, MACHINE GUN: 7.62-MM, M122 AND MACHINE GUN, 7.62-MM: M73 ON TANK, COMBAT, FULL-TRACKED: 105-MM GUN, M60 SERIES AND RIFLE, 7.62-MM: M14; FIRING CARTRIDGE, 7.62-MM, BALL, NATO, M59; CARTRIDGE, 7.62-MM, BALL, NATO, M80; CARTRIDGE, 7.62-MM: AP, NATO, M61 AND CARTRIDGE, 7.62-MM: TRACER, NATO, M62 (REPRINTED W/BASIC INCL C1) (S&I BY PROP SEE DETAILS, FOOTNOTES), ADDENDUM TO FT 8-Q-1 FOR PROJECTILE, HE, M404 (S&I BY PROP SEE DETAILS, FOOTNOTES), ADDENDUM TO FT 8-J-4 FOR PROJECTILE, HE, M404 (S&I BY PROP SEE DETAILS, FOOTNOTES), ADDENDUM TO FT 8-T-1 FOR PROJECTILE, HE: M509A1 (S&I BY PROP SEE DETAILS, FOOTNOTES), CANNON, 8-INCH HOWITZER, M201A1 ON HOWITZER, HEAVY, SELF-PROPELLED, 8-INCH, M110A2 FOR LOW ANGLE FIRING PROJECTILE, HE, M509A1 USING REGISTRATION DATA FOR PROJECTILE, HE, M106 (S&I BY PROP SEE DETAILS, FOOTNOTES), CANNON, 8-INCH HOWITZER: M2 AND M2A1 ON HOWITZER, HEAVY, TOWED: 8-INCH, M115; CANNON, 8-INCH HOWITZER: M47 ON HOWITZER, HEAVY, SELF-PROPELLED, FULL TRACKED: 8-INCH, M55; CANNON, 8-INCH HOWITZER: M2A1E1 ON HOWITZER, HEAVY, SELF-PROPELLED: 8-INCH, M110; FIRING PROJECTILE, HE: M106 AND PROJECTILE, CHEMICAL: M426 (S&I BY PROP SEE DETAILS, FOOTNOTES), CANNON, 8-INCH HOWITZER, M201 ON HOWITZER, HEAVY, SELF-PROPELLED: 8-INCH, M110A1 AND CANNON, 8-INCH HOWITZER, M201A1 ON HOWITZER, HEAVY, SELF-PROPELLED: 8-INCH, M110A2 AND FIRING PROJECTILE, HE, M106 PROJECTILE, CHEMICAL, M426 (S&I BY PROP SEE DETAILS, FOOTNOTES), CANNON, 8-INCH HOWITZER: M201A1 ON HOWITZER, HEAVY, SELF-PROPELLED, 8-INCH, M110A2; FIRING PROJECTILE, HE, RA; M650 AND PROJECTILE, ATOMIC: M753 AND M753A1 (S&I BY PROP SEE DETAILS, FOOTNOTES), CANNON, 8-INCH HOWITZER, M201A1 ON HOWITZER, HEAVY, SELF-PROPELLED: 8-INCH, M110A2 FIRING PROJECTILE, HE, M509A1 (S&I BY PROP SEE DETAILS, FOOTNOTES), CANNON, 14.5-MM GUN, M31; ARTILLERY TRAINER FIRING FUZED CARTRIDGES, M181, M182 AND M183 (S&I BY PROP SEE DETAILS, FOOTNOTES), GUN, 20-MM, AUTOMATIC, M139; FIRING CARTRIDGE, 20-MM, HEIT, M599; CARTRIDGE, 20-MM, TPT, M206 AND CARTRIDGE, 20-MM, APIT, M601 (S&I BY PROP SEE DETAILS, FOOTNOTES), FIRING TABLES FOR CANNON, 25MM GUN, M242 ON INFANTRY FIGHTING VEHICLE, M3 FIRING CARTRIDGE, APDS-T, M791 CARTRIDGE, HEI-T, M792 CARTRIDGE, TP-T, M793 CARTRIDGE, TPDS-T, M910 (S&I BY PROP SEE DETAILS, FOOTNOTES), GUN, AUTOMATIC, 40-MM, M1 AND GUN, DUAL AUTOMATIC, 40-MM, M2; FIRING CARTRIDGE, HE-T, SD, MK 2 WITH FUZES, PD, MK 27, M64A1, M71 OR NO. c. Crest Clearance. If water is not available, the gunner must stand clear of the mortar until the barrel is cool. The safety pull wire is removed just before inserting the cartridge into the mortar. He opens the cross-level handwheel, traversing handwheel, and barrel clamp. 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. He releases the securing strap, loosens the leg-locking handwheel, and lowers the plain leg until the locating catch engages in the recess. It arms within a maximum of 2.50 seconds. Lock He has the duty of preparing the ammunition and passing it to the assistant gunner. The increments are individually wrapped with waterproof bags that are not removed. 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 cartridges are painted olive drab with yellow markings. ), 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). As a longstanding partner of armed forces around the globe, Rheinmetall supplies a wide array of mortar systems and ammunition. He levels all bubbles. General Dynamics Ordnance and Tactical Systems' 81mm Roll Controlled Guided Mortar (RCGM) provides an affordable, flexible solution to meet that need. These cartridges are used first in subsequent firing so that once-opened stocks can be kept to a minimum. The floating firing pin located within the primer has approximately 1/16 of an inch to move around. At the same time, the first ammunition bearer moves out on the double to realign the aiming posts. The section leader, acting as FDC, has one deflection instead of two or more. Do not burn increments in piles but spread them in a train 1 to 2 inches deep, 4 to 6 inches wide, and as long as necessary. 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. The cartridge must not be fired below charge 3. These fuzes use a clockwork mechanism to delay functioning for a specific time. The fuze arms and functions normally when fired at any angle of elevation between 0800 and 1406 mils at charges 1 through 9. SQUAD AND SECTION ORGANIZATION AND DUTIES, Each member of the infantry mortar squad has principle duties and responsibilities. This ensures a maximum traversing and elevating capability after making the movement. The 81mm mortar rounds use Red Phosphorus as the smoke generating agent. When a large number of cartridges are needed for a mission, they may be removed from the containers and prepared. Cartridges assembled with the M524 (A1, A2, A3, or A4) fuze are for use by the U.S. Marine Corps and U.S. Navy only. (1) Marking on container. The 81-mm mortar, M252, is a smooth-bore, muzzle-loaded, high-angle-of-fire weapon. This document (FT 81 B3, abridged) consists of two pages, each with a separate table. Those cartridges assembled with the M524 (A1, A2, A3, or A4) fuze are for use by the US Marine Corps and US Navy only. The fuze consists of a brass head, body assembly, and expelling charge. The 81mm mortar is a portable, mobile, medium mortar at the infantry's disposal. b. 81-mm MORTAR, M252 The 81-mm mortar, M252, delivers timely, accurate fires to meet the . 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. Illuminating is used for battlefield illumination and signaling. The fuze is nicely marked and is dated 1940. The fuze setter, M25, sets M84-series time fuzes. It is especially useful if the baseplate sinks deep into the ground during prolonged firing. To dismount the mortar, the squad leader commands, OUT OF ACTION. The mortar is then re-laid on the aiming posts using the traversing crank. c. Upon receiving the command REFER, REALIGN AIMING POST, two actions take place at the same time in the mortar squad. (1) The M935 fuze has two function settings: impact and delay. Ammunition is typed according to use (Table 4-2). In addition to loading, he swabs the bore after 10 rounds have been fired or after each fire mission. (4) The M567 fuze is an impact fuze that has a SQ/IMP or D function. 107 Army Pentagon The wrench (P/N 9349539) sets M772 MT and M768 time fuzes. Their firing positions and principal duties are as follows: a. A lock ( .50: AP, M2 AND CARTRIDGE, CAL. News. a. This round may be stored in a horizontal position. When targets are beyond such irregularities, a clearance of at least 30 meters should be allowed to ensure maximum effect over the target area. The air burst over average types of soil ranges from 1 to 6 meters, depending on the angle of approach. The cartridge is painted olive drab with yellow markings and weighs about 9.05 pounds. He makes large deflection shifts by shifting the bipod assembly and keeps the bubbles level during firing. . The gunner is given a deflection change in a fire command between 20 and 60 mils inclusive. 4-12. (2) The M84 fuze is a single-purpose, powder-train, mechanical-time fuze used with the 81-mm M301A1 and M301A2 illuminating cartridges. 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. OPERATOR`S MANUAL FOR MORTAR, 81-MM, M252 (NSN 1015-01-164-6651) (EIC 4SK){TM . f. Installation. The superior flow characteristics of these BALL POWDER . The vertical cross line of the sight is on the left edge of the aiming point. (3) The M84A1 fuze is a single-purpose, tungsten-ring, mechanical-time fuze used with the 81-mm M301A3 illumination cartridge. On its right side, the clamp is recessed to receive the ball end of the locking rod. (7) When opening an ammunition box, the ammunition bearer ensures the box is horizontal to the ground, not nose- or fin-end up. In addition to supervising the emplacement, laying, and firing of the mortar, he supervises all other squad activities. 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. The body is made of aluminum and brass. He may assist the gunner in shifting the mortar when the gunner is making large deflection changes. The BAD is removed only by qualified maintenance personnel. All rounds are colored according to their type. However, since explosives are affected by moisture and high temperature, they must be protected. FT 81-AI-3 Firing Tables Mortar, 81mm: M28A1 and M29 Mortar 81mm Self propelled M125A1 and M125 Carrier, 81mm Mortar Tracked XM755 [US Army.] The M1 became the standard American . Normally, it can be moved by hand, although this may be difficult to do if the mortar is moved through a large arc. It is constructed from ductile cast iron and contains about 1.5 pounds of cyclonite (RDX)/trinitrotoluene (TNT) composition explosive. b. It is set using the bladed end of the M18 fuze wrench. Types of rounds, classification, and characteristics for the 81-mm mortar, M29A1 (Standard B for the 81-mm mortar, M252). Official websites use .mil The fuzes may be used for day or night operations. The sight bracket is attached to the buffer carrier, which is fitted to the traversing screw assembly. He places the sight case and aiming posts to the left front of the mortar position. The ammunition that can be fired by the 81-mm mortar, M252, is identified and described herein. b. 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. Before the mortar is mounted, the squad must perform premount checks. The 60mm mortar section is located in the weapons platoon of the rifle company, is armed with three 60mm mortars, and is Fuzes are not disassembled. Prev - Mk6 Mortar range table for charge 0 Next - Mk6 Mortar range table for charge 2 . d. The M374A2, M374A1, and M374 HE cartridges are painted olive drab with yellow markings and are constructed from pearlitic malleable cast iron. d. Multioption. (1) The barrel is clean and free from grease and oil both inside and out. The round is still safe to handle and transport if the safety wire is reinserted. The propelling charge consists of an ignition cartridge and removable propellant increments.
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