A plain leg is fitted to a stud on the elevating leg and is secured by a leg-locking handwheel. (b) In selecting the exact mortar position, the leader looks quickly for mask clearance and overhead interference. Their firing positions and principal duties are as follows: a. The round has a burst height of 600 meters and provides illumination for about 60 seconds for an area of about 1,200 meters. Table 4-1. (2) The ribs and braces have no breaks, cracks, or dents. They contain about 2.10 pounds of composition B explosive. All mortar cartridges are painted to prevent rust and to identify their type. The BAD is removed only by qualified maintenance personnel. b. The table on the right describes the three most common setups. b. Identification. The components of the mortar consist of a cannon, mount, and baseplate. The assistant gunner cleans the bore and swabs it dry. b. The baseplate (Figure 4-5) is of one-piece construction, and supports and aligns the mortar for firing. 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. The ignition cartridge (with primer) is fitted into the base of the fin shaft. The tabulated data of the 81-mm mortar, M252, are shown in Table 4-1. An air cavity can form on one side of a cartridge to unbalance it, causing instability in flight. (d) Firing is slowed if mask clearance must be checked before each firing but this can be eliminated if minimum mask clearance is determined. Each cartridge weighs about 10 pounds and is provided with the M223 propelling charge, consisting of four horseshoe-shaped increments fitted around the tail. It should be destroyed in accordance with standard procedures. The mortar is mounted and the sight is installed. The squad leader points to the exact spot where the mortar is to be mounted. System (including basic issue items) During training, the gunner may use the driving stake from the aiming post case. CANNON . The 81mm mortar is a portable, mobile, medium mortar at the infantry's disposal. It weighs about 9.05 pounds. The M252 medium mortar offers a compromise between the light and heavy mortars. He ensures that the firing pin recess is facing upwards. The 81-mm mortar, M252, is a smooth-bore, muzzle-loaded, high-angle-of-fire weapon. b. (6) The primer cartridge is checked for damage or dampness. a. He then checks the sight picture to ensure he is within 20 mils of a proper sight picture. The barrel clamps are then closed. Other armies count on 81mm mortar families. MC Medical Guide; Client-side mods; TFAR 1.x for players; Several types of HE ammunition are used in the 81-mm mortar, M252. They are fuzed with the M524-series, M256-series, or M532. b. The gunner unlocks the barrel clamp and rotates the barrel, unlocking the breech plug from the rotating socket of the baseplate. The fuze arms and functions normally when fired at any angle of elevation between 0800 and 1406 mils at charges 1 through 9. Both the 60mm and 120mm mortar rounds use White Phosphorus. It was even a tool used by airborne units, and was dropped in parachute bundles during Operations Neptune, Market Garden, and Varsity. .50 MACHINE GUN, M3; FIRING CARTRIDGE, CAL. News. 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 may preclude moving the bipod. It has four function settings: PRX (proximity) causes the cartridge to explode between 3 and 13 feet above the ground; NSB (near-surface burst) causes the cartridge to explode up to 3 feet above the ground; IM (impact) causes the cartridge to explode on contact; and DLY (delay) incorporates a 0.05-second delay in the fuze train before exploding the cartridge. The gunner places the announced deflection on the sight (without disturbing the lay of the weapon) and looks through the sightunit. The propelling charges are assembled around the fin assembly shaft. 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 cannon has a crew-removable breech plug and firing pin. b. After the barrel cools, the gunner removes the sight and firing pin. .30, BROWNING, M1919A4 AND M2 (HEAVY BARREL), .30, M2 (REPRINTED W/BASIC INCL C1) (S&I BY PROP SEE DETAILS, FOOTNOTES), GUN, MACHINE: CAL. FIRING TABLE 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; AND HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A3B; 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 FIRING PROJECTILE, GUIDED, M712 (COPPERHEAD) WITH SHAPED TRAJECTORIES (S&I BY PROP SEE DETAILS, FOOTNOTES), PROVISIONAL AIMING DATA FOR CANNON, 155MM, HOWITZER, M185 ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, 109A1 HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, 109A1B HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A2 AND 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, BASE-BURN, M864 AND M864A1 (S&I BY PROP SEE DETAILS, FOOTNOTES), PRELIMINARY AIMING DATA FOR CANNON, 155MM HOWITZER, M284 ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A6 AND CANNON, 155MM HOWITZER, M776 ON HOWITZER, MEDIUM, TOWED, 155MM, M777A2 FIRING PROJECTILE, HE, XM982 (S&I BY PROP SEE DETAILS, FOOTNOTES), PROVISIONAL AIMING DATA FOR CANNON, 155MM HOWITZER, M284 ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A6 AND CANNON, 155MM HOWITZER, M776 ON HOWITZER, MEDIUM, TOWED, 155MM, M777A2 FIRING PROJECTILE, HE, XM982 (S&I BY PROP SEE DETAILS, FOOTNOTES), PROVISIONAL AIMING DATA FOR CANNON, 155MM HOWITZER, M284 ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A6 AND CANNON, 155MM HOWITZER, M776 ON HOWITZER, MEDIUM, TOWED, 155MM, M777A2 FIRING PROJECTILE, HE, M982 (S&I BY PROP SEE DETAILS, FOOTNOTES), CANNON, 165-MM GUN, M135 ON COMBAT ENGINEER VEHICLE, FULL TRACKED, M728; FIRING CARTRIDGE, 165-MM, HEP, M123A1 AND 165-MM, TP-T, XM623 (S&I BY PROP SEE DETAILS, FOOTNOTES), CANNON, 175-MM GUN, M113 AND M113A1 ON GUN, FIELD ARTILLERY, SELF-PROPELLED: 175-MM, M107; FIRING PROJECTILE, HE, M437A2 AND M437A1 (S&I BY PROP SEE DETAILS, FOOTNOTES), RAPID FIRE TABLES FOR CALCULATION OF THE EXECUTIVE OFFICERS (XOS) MINIMUM QUADRANT ELEVATION WITH CANNON, 105MM HOWITZER, M20A1 ON HOWITZER, LIGHT, TOWED, 105MM, M119A1; HOWITZER, LIGHT, TOWED, 105MM, M119A2; HOWITZER, LIGHT, TOWED, 105MM, M119A3 FIRING WITH PROPELLING CHARGES, M67 AND M200 (S&I BY PROP SEE DETAILS, FOOTNOTES), RAPID FIRE TABLES FOR CALCULATION OF THE EXECUTIVE OFFICER S (XO S) MINIMUM QUADRANT ELEVATION WITH CANNON, 155MM HOWITZER, M284 ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A5/A6 AND CANNON, 155MM HOWITZER, M199 ON HOWITZER, MEDIUM, TOWED, 155MM, M198 AND CANNON, 155MM HOWITZER, M776 ON HOWITZER, MEDIUM, TOWED, 155MM, M777A1/A2 FIRING WITH PROPELLING CHARGES, M231, M232, AND M232A1 (S&I BY PROP SEE DETAILS, FOOTNOTES), RAPID FIRE TABLES FOR CALCULATION OF THE EXECUTIVE OFFICERS (XOS) MINIMUM QUADRANT ELEVATION WITH CANNON, 155MM HOWITZER, M284 ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A5; HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A6; AND HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A7, AND CANNON, 155MM HOWITZER, M776 ON HOWITZER, MEDIUM, TOWED, 155MM, M777A1 AND HOWITZER, MEDIUM, TOWED, 155MM, M777A2 FIRING WITH PROPELLING CHARGES, M231, M232, AND M232A1 (S&I BY PROPONENT, SEE DETAILS, FOOTNOTES), ADDENDUM TO FTR LANCE-B-1 FOR WARHEAD SECTION, GUIDED MISSILE, HE: M251 (U) (S&I BY PROP SEE DETAILS, FOOTNOTES), Search Army publications and forms by Number, Title, or Record Detail. (2) The barrel is locked to the baseplate, and the open end of the socket points in the direction of fire. 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). High angles of approach (near vertical) give the lowest burst heights. (2) The fin and fuze assembly must be checked for tightness and damage. A safety latch located at the side of the recess is used to secure the ball. 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. M64A1 Sightunit. b. He maintains the ammunition for firing and provides local security for the mortar position. The first ammunition bearer shakes the barrel to dislodge any remnants from the last round fired, and he lowers the barrel into the rotating socket of the baseplate. Barrel (with blast attenuator device) 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. Cartridges assembled with the M532 fuze must be fired above charge 0. The following safety checks must be enforced before firing the mortar. 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, HE, M795 PROJECTILE, HE, M795 IM PROJECTILE, HE, M1122 PROJECTILE, IR ILLUMINATING, M1123 PROJECTILE, ILLUMINATING, M1124 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 DETAILS, FOOTNOTES) . 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 . 0.30, BROWNING, M1917A1; GUN, MACHINE: CAL. e. The assistant gunner passes the round to the first ammunition bearer who inspects it for the cause of the misfire. Theme by TechDoc. The explosive elements in primers and fuzes are sensitive to shock and high temperature. The M532 fuze is a radio doppler fuze that has a proximity (PROX) or SQ/IMP function. The 81mm mortar rounds use Red Phosphorus as the smoke generating agent. The M1 became the standard American . He knocks down the near aiming post and proceeds to the far aiming post. If the round fires, the mortar is re-laid on the aiming point and firing is continued. The fuze is not intended to function at charge 0. In addition to supervising the emplacement, laying, and firing of the mortar, he supervises all other squad activities. The gunner is given an administrative command to lay the mortar on a deflection of 2860 or 2740 mils. Joint Tables of Allowance; PB - Professional Bulletins; STP - Soldier Training Publications; TC - Training Circulars; . They function normally in light rain; however, heavy rain, sleet, or snow can cause an increase in the number of early bursts. This is accomplished by depressing the barrel until the top of the mask is clear. (4) The M567 fuze is an impact fuze that has a SQ/IMP or D function. The standard infantry support weapon is the M-252 81mm mortar, which lobs a 10 lb. When set at SQ, the fuze functions on point impact or graze contact. It is designed to be fired in the indirect fire mode, cannot be fired handheld, and normally utilizes a FDC. The contents of ammunition containers are shown by markings. The cartridge must not be fired below charge 3. The M252 is highly accurate up to ranges of 4500m to 5700m depending on the MFCS Mounted. (3) The M84A1 fuze is a single-purpose, tungsten-ring, mechanical-time fuze used with the 81-mm M301A3 illumination cartridge. REFER DEFLECTION TWO EIGHT SEVEN FIVE (2875), REALIGN AIMING POSTS. How the RCGM works: Target coordinates are programed into the RCGM using a portable GPS setter. The same procedure for aligning the far aiming post is used to align the near aiming post. (2) Burn all dead grass or brush within 30 meters around the burning place. The floating firing pin located within the primer has approximately 1/16 of an inch to move around. ) or https:// means youve safely connected to the .gov website. 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. 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. e. The second ammunition bearer stands to the right rear of the mortar behind the ammunition bearer. The M821A2/821A1/889A1 consists of the following major components: M935 Point Detonating Fuze or M734/734A1 Multi-Option Fuze. 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 enemy will use them. Cartridges assembled with the M532 fuze must be fired above charge 0. This section discusses the. Fired . The principal factors affecting height of burst are the angle of approach to the target and the reflectivity of the target terrain. b. 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. The M301A3 cartridge has a cylindrical body that contains an illuminating candle and parachute assembly. The propellant increments are ignited, which produce rapidly expanding gases that force the cartridge from the barrel. If it gets wet or dirty, it must be wiped off at once. These cartridges are used first in subsequent firing so that once-opened stocks can be kept to a minimum. Lock WP cartridges are stored with the fuze end up. b. .50: BROWNING, M2 (HEAVY BARREL, FLEXIBLE) ON MOUNT, MACHINE GUN, TRIPOD MTD, CAL. This round may be stored in a horizontal position. (3) From this train, extend a starting train that will burn against the wind of single increments laid end to end. It is designed to be fired in the indirect fire mode, cannot be fired handheld, and norm ally utilizes a FDC. As a longstanding partner of armed forces around the globe, Rheinmetall supplies a wide array of mortar systems and ammunition. Types of rounds, classification, and characteristics for the 81-mm mortar, M29A1 (Standard B for the 81-mm mortar, M252). The propelling charge is contained in four horseshoe-shaped, felt-fiber containers or nine wax-tested, cotton cloth, bag increments. 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 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 M374 cartridge is fitted with the M90 propelling charge. Powered by Hugo. HE Guided Mortar is in development. It is painted white with black markings. It uses the M772 mechanical time fuze and weighs about 10.6 pounds. The fuze body is graduated from 0 to 25 seconds in 1-second intervals; 5-second intervals are indicated by bosses. d. The M374A2, M374A1, and M374 HE cartridges are painted olive drab with yellow markings and are constructed from pearlitic malleable cast iron. a. The gunner checks the baseplate and ensures that--. It provides illumination for about 60 seconds with 600,000 candlepower illumination. High explosive--M821, M889, M374-series, and M362. During firing, the breech plug on the barrel is sealed and locked to the rotatable socket in the baseplate. e. Care, Handling, and Preservation. 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. At the muzzle end is a cone-shaped blast attenuator device (BAD) that is fitted to reduce noise. Overhead interference can be branches of trees or roofs of buildings. He makes large deflection shifts by shifting the bipod assembly and keeps the bubbles level during firing. . 107 Army Pentagon See Chapter 3, paragraph 3-14 for a detailed discussion of malfunctions. The components of the mortar consist of a cannon, mount, and baseplate. Firing tables are used to determine the correct charge for firing. (e) If the mask is not regular throughout the sector of fire, the gunner determines the minimum mask clearance as described above. 60mm, 81mm, and 120mmMortar Increments. Agreed that mortars should generally be used close to the frontline. c. The assistant gunner disengages the barrel clamps and moves the bipod from the immediate area of the mortar position. f. Ammunition should be stored under cover. General Dynamics Ordnance and Tactical Systems' 81mm Roll Controlled Guided Mortar (RCGM) provides an affordable, flexible solution to meet that need. *FREE* shipping on qualifying offers. The cartridge weighs about 9.12 pounds. 81MM M252A1. Official websites use .mil The M252 81mm mortar is a smooth-bore, muzzle-loaded, high-angle-of-fire weapon. Share sensitive information only on official, secure websites. 120mm IHE grenade DM91. Each squad member should be able to perform all the following premount checks: a. The M375 cartridge uses the M90 propelling charge while the M375A2 and M375A1 cartridges use the M90A1 propelling charge. a. It uses the M205 propelling charge, consisting of four horseshoe-shaped increments fitted around the tail. If the mortar section is to operate quickly and effectively in accomplishing its mission, mortar squad members must be proficient in individually assigned duties. Maximum Range (meters): 7,240 (with standard fuze) . It is set using the bladed end of the M18 fuze wrench. a. An 81 mm mortar is a medium-weight mortar. 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. c. Authorized Cartridges. (2) The M524-series fuze has two function settings: superquick/impact (SQ/IMP) and delay. He moves the mortar until the vertical line of the sight is aligned approximately on the aiming post. In charge was the platoon commander - normally a lieutenant. Prev - Mk6 Mortar range table for charge 0 Next - Mk6 Mortar range table for charge 2 . 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. VERY NICE condition! While the assistant gunner supports the barrel, the gunner slackens the leg-locking handwheel, releases the locating catch, and positions the plain leg. Both legs are fitted with a disk-shaped foot with a spike beneath to prevent the mount from slipping. Additional information is included on an ammunition data card inside each container. .30 BROWNING, M1917 AND M1917A1; GUN, MACHINE, CAL. After the mortar is mounted, the gunner makes a thorough check. It is constructed from ductile cast iron and contains about 1.5 pounds of cyclonite (RDX)/trinitrotoluene (TNT) composition explosive. 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. An ammunition lot number is assigned to each ammunition lot, which is marked on each cartridge and packing container. (4) Extra increments are removed if the cartridge is to be fired with less than full charge. The M853 and M301A3 illuminating ammunition are described herein. h. Where the ground is uneven and there is no level surface for the bipod, the gunner can adjust the plain leg. He has the duty of preparing the ammunition and passing it to the assistant gunner. 120MM Mortar System. The cartridge is painted light green with black markings and one narrow brown band. 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. Short cartridges can be expected when firing below charge 4. The wrench (P/N 9349539) sets M772 MT and M768 time fuzes. The removable increments are fitted onto or around the shaft, depending on their type. An internal clock mechanism provides nine seconds of safe air travel (610 to 2,340 meters along trajectory for charge 0 through 9, respectively). He may assist the gunner in shifting the mortar when the gunner is making large deflection changes. All elements given in the fire command are repeated by the squad. A lock ( He indicates the initial direction of fire by pointing in that direction and commands ACTION. To set for delay, the selector slot should be rotated clockwise until it is aligned with the "D" mark on the ogive. These are NDI items . This may cause the firing pin to ignite the charges if the cartridge is dropped on the fin end (. 4-12. An M18 fuze wrench is used to change settings.
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