Army Publishing Directorate - Details Page He tightens the leg-locking handwheel (ensuring the teeth are correctly meshed) and fastens the securing strap over the arm and around the buffers. Mk6 Mortar range table for charge 1 - Arma Docs for MC - Misfit Company The gunner is given a deflection change in a fire command between 20 and 60 mils inclusive. a. Cartridges are shipped with a complete propelling charge, an ignition cartridge, and primer. c. Authorized Cartridges. Complete cartridges are always handled with care. High explosive is used for both fragmentation and blast effect against personnel and light-skinned vehicles. (2) The M84 fuze is a single-purpose, powder-train, mechanical-time fuze used with the 81-mm M301A1 and M301A2 illuminating cartridges. 81-mm MORTAR, M252 The 81-mm mortar, M252, delivers timely, accurate fires to meet the . All PD fuzes are superquick--detonate on impact. Fuze, PD, for 81mm mortar rounds, Italy, WWII, inert 120MM Mortar System. The propellant train (except the training cartridge) consists of an ignition cartridge and propellant charges. 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.] (3) The M256-series fuze has an SQ/IMP function only. The elevation change announced must be less than 90 mils and more than 35 mils. General Dynamics Ordnance and Tactical Systems is the leading manufacturer of propellants for 60mm, 81mm and 120mm Mortar Systems. .50: BROWNING, M2 (HEAVY BARREL, FLEXIBLE) ON MOUNT, MACHINE GUN, TRIPOD MTD, CAL. (2) The fin and fuze assembly must be checked for tightness and damage. If, upon removal of the safety wire, a buzzing sound in the fuze is heard, the round should not be used. The components of the mortar consist of a cannon, mount, and baseplate. a. News. 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. This round must be stored in a vertical position. TM - Technical Manuals (Range 9) TM - Technical Manuals (Range 10) TM - Technical Manuals (Range 11-4) TM - Technical Manuals (Range 11-5) . d. The gunner rough levels the cross-level bubble by making the bubble bounce from one side to the other. The M1 became the standard American . After the rounds have been removed, they should always be handled with two hands to prevent accidental dropping. c. After the gunner has announced, "Up," the squad leader should check the mortar to determine if the exercise was performed correctly. (2) The ribs and braces have no breaks, cracks, or dents. b. The mortar is mounted and the sight is installed. He makes large deflection shifts by shifting the bipod assembly and keeps the bubbles level during firing. The M734 multioption fuze is the only one used with the 81-mm mortar. Each round is stenciled with the ammunition lot number, type of round, type of filler, and caliber. 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. There is a selector on the lower shaft for non-delay or delay impact action. 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 M821A2/821A1/889A1 consists of the following major components: M935 Point Detonating Fuze or M734/734A1 Multi-Option Fuze. ), 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. b. The principal factors affecting height of burst are the angle of approach to the target and the reflectivity of the target terrain. (1) The M935 fuze has two function settings: impact and delay. It contains white phosphorus that produces white smoke on contact with air. The round has a burst height of 600 meters and provides illumination for about 60 seconds for an area of about 1,200 meters. Then it is removed from the bipod and laid horizontally on the ground at the dud pit until it can be turned over to ordnance personnel. Identification. a. M252 mortar - Wikipedia 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. . The M1 was a derivative of the French mle 27/31 system (itself an improved form of the Stokes Trench Mortar of World War 1 fame) and slightly altered to suit American needs. Attached to the right of the screw is the traversing handwheel. He rotates the socket so that the open end is pointing in the direction of fire. If the barrel is hot, the gunner may then apply water to the outside of the barrel until it is cool. A locked padlock When the gunner is satisfied with his sight picture he announces, "Up.". During firing, the breech plug on the barrel is sealed and locked to the rotatable socket in the baseplate. The safety/packing clip should be removed when the cartridge is unpacked. The M853 cartridge (M252 only) has a cylindrical body that contains an illuminating candle and parachute assembly. To dismount the mortar, the squad leader commands, OUT OF ACTION. The cannon has a crew-removable breech plug and firing pin. 0.30, BROWNING, M1919A4, M1919A5 AND M1919A6 {TO 39A-5 AF-32} (S&I BY PROP SEE DETAILS, FOOTNOTES), GUN, MACHINE, CAL. It has no safety pins or wires to reduce preparation time. b. An air cavity can form on one side of a cartridge to unbalance it, causing instability in flight. The M751 fuze is the only dummy fuze used with the 81-mm mortar. The M252 system . The terms cannon and barrel are used interchangeably in this chapter. The gunner should expose 6 inches (150 millimeters) of elevation shaft and center the buffer carrier. b. PDF Introduction to Crew Served Weapons B3m4078 Student Handout Home; Swifty. No tools are needed to set the fuze, and the setting can be changed several times without damaging the fuze. a. 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. The M374A2 and M374A1 cartridges are fitted with the M90A1 propelling charge. The gunner then kicks the barrel several times with his heel in an attempt to dislodge the round. The fuze has a safety wire that must be removed before firing. 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. That is generally how I use mortars. The term "danger close" is included in the call for fire when there are friendly troops or positions within a prescribed distance of the target, specifically 600 meters for artillery or mortars . Table 4-3. The entire squad stays with the mortar. c. The moisture-resistant seal of the container is broken when the ammunition is to be used. 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. Figure 4-7. They function normally in light rain; however, heavy rain, sleet, or snow can cause an increase in the number of early bursts. They should not be approached for 5 minutes or disturbed for at least 30 minutes after firing. At the command, MARCH ORDER, the squad places the mortar, equipment, and ammunition in the squad vehicle and trailer. These fuzes use a clockwork mechanism to delay functioning for a specific time. Then he relocks the barrel clamp. SMALL DEFLECTION AND ELEVATION CHANGES. MC Medical Guide; Client-side mods; TFAR 1.x for players; The cartridge can be fitted with the M524-series, M526-series, M567, or M532 fuzes. The M751 is fitted with a smoke charge that operates on impact. (e) If the mask is not regular throughout the sector of fire, the gunner determines the minimum mask clearance as described above. 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). Bear in mind that these are my personal opinions, experiences, and . M64A1 Sightunit. The aluminum tail assembly has six integral fins equally spaced around the rear, which stabilize the round in flight. On its right side, the clamp is recessed to receive the ball end of the locking rod. REFERRING OF THE SIGHT AND REALIGNMENT OF AIMING POSTS USING M64 SIGHT. ), 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). He places firing data on the sight and lays the mortar for deflection and elevation. It was even a tool used by airborne units, and was dropped in parachute bundles during Operations Neptune, Market Garden, and Varsity. (3) The securing strap is correctly located, securing the barrel clamps and buffers to the plain leg. The assistant gunner checks the bipod and ensures that--. M252 81mm Medium Extended Range Mortar - Specifications a. The ammunition that can be fired by the 81-mm mortar, M252, is identified and described herein. The M821 HE cartridge (M252 only) is a British-made cartridge fitted with the US M734 multioption fuze. Fuzes are not disassembled. The same procedure for aligning the far aiming post is used to align the near aiming post. d. The squad leader supervises the squad drill and is responsible for supervising the laying out of the equipment as shown in Figure 4-6. 60mm, 81mm, and 120mm Mortar Increments with Ball Powder Propellants The second page includes a chart with range and deflection (presumably for the same kind of shells), as well as notes which give additional instructions. 107 Army Pentagon PDF Principles of Fire Support B2c0289xq Student Handout Despite its weight though, the 81mm mortar was an important part of the Table of Organization and Equipment of U.S. Army and U.S. Marine Corps maneuver battalions throughout World War II. Cartridges assembled with the M532 fuze must be fired above charge 0. M3A1 Baseplate General Dynamics Ordnance and Tactical Systems' 81mm Roll Controlled Guided Mortar (RCGM) provides an affordable, flexible solution to meet that need. This may preclude moving the bipod. [Firing and Deflection Conversion Tables] - The Portal to Texas History b. The tabulated data of the 81-mm mortar, M252, are shown in Table 4-1. U.S. Mortars of World War II - World War Media The fuze is screwed into the cartridge body, and it is seated and secured using an M18 wrench. Notches in the setter engage ribs in the setting ring of the fuze. The M821/M889 are 81mm HE Mortar Cartridges. The barrel clamps are then closed. 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 gunner checks the baseplate and ensures that--. 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. This ensures that the mortar does not fire should the round slip down the barrel during the subsequent drills. Close approach to crests, trees, towers, large buildings, parked aircraft, mechanized equipment, and similar irregularities causes functioning at heights greater than average level. It uses the M772 mechanical time fuze and weighs about 10.6 pounds. These are NDI items . The wrench (P/N 9349539) sets M772 MT and M768 time fuzes. The M252 medium mortar offers a compromise between the light and heavy mortars. The mortar is within two turns of center of traverse. The cartridge weighs about 9.4 pounds. a. c. The first ammunition bearer ensures that each cartridge is clean, the safety pin is present, and the ignition cartridge is in good condition. In charge was the platoon commander - normally a lieutenant. The cartridges are painted olive drab with yellow markings. He has the duty of preparing the ammunition and passing it to the assistant gunner. He maintains the ammunition for firing and provides local security for the mortar position. 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. (5) Do not leave unused increments unburned in combat operational areas. (4) The blast attentuator device is secured correctly. The first table is a chart that shows range and elevation for firing particular mortar shells. The gunner stands to the left side of the mortar where he can manipulate the sight, elevating handwheel, and traversing handwheel.