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 increments are individually wrapped with waterproof bags that are not removed. He releases the securing strap, loosens the leg-locking handwheel, and lowers the plain leg until the locating catch engages in the recess. They function normally in light rain; however, heavy rain, sleet, or snow can cause an increase in the number of early bursts. High angles of approach (near vertical) give the lowest burst heights. The cartridge must not be fired below charge 3. 4-10. The M375A3 cartridge is ballistically similar to the M374A3 (HE) cartridge. No tools are needed to set the fuze, and the setting can be changed several times without damaging the fuze. The powder increments, mainly, should not be exposed to direct sunlight. The table on the right describes the three most common setups. Types of rounds, classification, and characteristics for the 81-mm mortar, M252. The principal factors affecting height of burst are the angle of approach to the target and the reflectivity of the target terrain. System (including basic issue items) It is designed to be fired in the indirect fire mode, cannot be fired handheld, and norm ally utilizes a FDC. 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). When set at delay, the fuze train causes a 0.05-second delay before functioning. He lays for deflection, taking the proper sight picture. Trenches are dug to prevent water from flowing under the pile. Safety before firing is provided by a safety wire, which must be removed just before firing. Table 4-1. 107 Army Pentagon A spring-loaded locating catch is behind the elevating gear housing, which locates the plain leg in its supporting position for level ground. Long Range PGK. 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. It is used for records such as reports on condition, malfunctions, and accidents. The fuze is screwed into the cartridge body, and it is seated and secured using an M18 wrench. XM1210. This section implements STANAG 2321 and QSTAG 900 (Edition 1). 60mm, 81mm, and 120mmMortar Increments. Joint Tables of Allowance; PB - Professional Bulletins; STP - Soldier Training Publications; TC - Training Circulars; . They contain about 2.10 pounds of composition B explosive. on Amazon.com. The mortar also offered the promised increase in range as well, allowing fire teams to engage the enemy at distance. 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 mortar is within two turns of center of traverse. The second ammunition bearer retrieves the aiming posts. The round has a burst height of 600 meters and provides illumination for about 60 seconds for an area of about 1,200 meters. At this command, the squad proceeds as follows: a. The M374A2 and M374A1 cartridges are fitted with the M90A1 propelling charge. h. Where the ground is uneven and there is no level surface for the bipod, the gunner can adjust the plain leg. 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 . a. Cartridges are shipped with a complete propelling charge, an ignition cartridge, and primer. In addition to loading, he swabs the bore after 10 rounds have been fired or after each fire mission. (2) The ribs and braces have no breaks, cracks, or dents. A lock ( At extreme temperatures (below -40 degrees Fahrenheit and above 125 degrees Fahrenheit), it is not unusual to experience an increase in malfunctions proportionate to the severity of conditions. e. The M362A1 and M362 HE cartridges are of steel forge construction and contain about 2.10 pounds of composition B explosive. If the primer is not dented, the round may be used again. He positions the lower barrel clamp against the lower stop band on the barrel and secures the upper barrel clamp. b. The gunner unlocks the barrel clamp and rotates the barrel, unlocking the breech plug from the rotating socket of the baseplate. It should be destroyed in accordance with standard procedures. M120/M121 120 mm Mortar. 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. This action breaks an internal sheet pin and internal wire, thereby disabling the proximity function. Fuzes are not disassembled. Official websites use .mil 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. 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 cleans the bore and swabs it dry. An ammunition lot number is assigned to each ammunition lot, which is marked on each cartridge and packing container. Attached to the right of the screw is the traversing handwheel. These fuzes use a clockwork mechanism to delay functioning for a specific time. Share sensitive information only on official, secure websites. d. The gunner rough levels the cross-level bubble by making the bubble bounce from one side to the other. 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 . It was even a tool used by airborne units, and was dropped in parachute bundles during Operations Neptune, Market Garden, and Varsity. Firing tables are used to determine the correct charge for firing. End this starting train with not less than 1 meter of inert material (dry grass, leaves, or newspapers). Standard A ammunition for the M29A1 mortar is Standard B for the M252 mortar (, Light green Yellow band with red markings. As a longstanding partner of armed forces around the globe, Rheinmetall supplies a wide array of mortar systems and ammunition. SQUAD AND SECTION ORGANIZATION AND DUTIES, Each member of the infantry mortar squad has principle duties and responsibilities. The gunner checks the baseplate and ensures that--. f. Installation. He places his thumbs alongside the forefingers, being careful to keep both hands away from the muzzle. a. Point-Detonating. a. After the bands are broken and the box opened, the rounds should be removed by allowing them to roll out along the lid of the box (Figure 4-8). The gunner is given a deflection change in a fire command between 20 and 60 mils inclusive. These are NDI items . Tabulated data. .50: BROWNING, M2 (HEAVY BARREL, TURRET TYPE) ON MOUNT, MACHINE GUN, TRAILER MTD: MULTIPLE CAL. He makes large deflection shifts by shifting the bipod assembly and keeps the bubbles level during firing. It is a 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. Theme by TechDoc. News. 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 c. The moisture-resistant seal of the container is broken when the ammunition is to be used. The M819 cartridge (M252 only) has a cylindrical body and contains red phosphorus that produces white smoke on contact with air. The striker has been modified to be able to use German and Italian patterns of 81mm mortar . ), 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). To convert the fuze from PROX to SQ/IMP, the top of the fuze must be rotated 120 degrees (one-third turn) in either direction. That is generally how I use mortars. This may preclude moving the bipod. He places the sight case and aiming posts to the left front of the mortar position. The air burst over average types of soil ranges from 1 to 6 meters, depending on the angle of approach. The removable increments are fitted onto or around the shaft, depending on their type. All mortar cartridges are painted to prevent rust and to identify their type. The fuze setter, M25, sets M84-series time fuzes. Notches in the setter engage ribs in the setting ring of the fuze. The safety pull wire is removed just before inserting the cartridge into the mortar. (The handle of the wrench is turned counterclockwise.) HE Guided Mortar is in development. The barrel clamp, which consists of an upper and lower clamp, is situated at the top. 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 . 0.30, BROWNING, M1919A4, M1919A5 AND M1919A6 {TO 39A-5 AF-32} (S&I BY PROP SEE DETAILS, FOOTNOTES), GUN, MACHINE, CAL. The muzzle end has a short tapered lead-in which acts as a . 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.