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. This publication, DEPARTMENT OF THE ARMY 9 e89600 60mm mortar, all types 175 10 e76000 81mm mortar, all types 209 11 e25500, REVIEWER AFPOS: INFANTRY RANK: CORPORAL 2017-08-01 a. This action breaks an internal sheet pin and internal wire, thereby disabling the proximity function. The cartridges are returned to their original containers. The entire squad stays with the mortar. Trenches are dug to prevent water from flowing under the pile. Match. Baseplate placed against baseplate stake. effect)Deflection(2850)Charge(2)Elevation(1150), *Question: In firing with a FDC, the initial fire command gives the minimum range with all . When testing the burning rate of a safety fuze what are the minimum and maximum times between which the fuze must burn, What distance should be used when applying normal safety criteria during training, When applying the normal safety criteria, at what distance should mortars bed in prior to using the normal minimum range 705m, Why do we ask questions during an instructional period, What is the correct procedure for asking questions, State the methods of maintaining the desire to learn. The gunner moves the mortar as the assistant gunner steadies it. 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. The minimum range for M889 ammunition is 83 meters. Americans also report the effectiveness of German mortars in Italy, at least until late 1944 and 45 when the US Army started to use an antiaircraft radar originally designed to accompany the US Army's 90mm AAA gun in the counter-battery radar role. A proximity fuze is an electronic device that detonates a projectile by means of radio waves sent out from a small radio set in the nose of the projectile. The M374 cartridge is fitted with the M90 propelling charge. c. The M375A2, M375A1, and M375 cartridges may also be used. (1) The barrel is clean and free from grease and oil both inside and out. He places firing data on the sight and lays the mortar for deflection and elevation. d. The M374A2, M374A1, and M374 HE cartridges are painted olive drab with yellow markings and are constructed from pearlitic malleable cast iron. h. Where the ground is uneven and there is no level surface for the bipod, the gunner can adjust the plain leg. Both legs are fitted with a disk-shaped foot with a spike beneath to prevent the mount from slipping. f. If the above procedure fails to remove the misfire, the barrel must be kept horizontal. Study sets, textbooks, questions. He uses the chain of command to assist him in effecting his command and supervising duties. See Chapter 3, paragraph 3-14 for a detailed discussion of malfunctions. When fired, the cartridge carries the ignition cartridge with it, leaving the mortar ready for the next cartridge. (8) To help minimize the occurrence of short rounds and or duds, unpackaged ammunition that has been dropped should not be fired. 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. b. 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. This section discusses the characteristics and nomenclature of each component (Figure 4-2). It is constructed from ductile cast iron and contains about 1.5 pounds of cyclonite (RDX)/trinitrotoluene (TNT) composition explosive. This cartridge is ballistically matched to the M374A2, M374A1, and M375 HE cartridges, and weighs about 9.12 pounds. REFER DEFLECTION TWO EIGHT SEVEN FIVE (2875), REALIGN AIMING POSTS. Burst Height. c. Mechanical Time. TM 9-1015-200-10 M29A1 Operator's Manual. Learn. Referring and realigning aiming posts ensure that all mortars are set on the same data. It has no safety pins or wires to reduce preparation time. Ammunition is made and packed to withstand all conditions ordinarily encountered in the field. What is the meaning of the common term "First Bearing" ? It originated as a joint design by the UK and Canada. d. The gunner recovers the baseplate to the area designated by the squad leader. He is also the squad driver. Cartridges assembled with the M532 fuze must be fired above charge 0. Home. 81mm mortar & shell. Section I. 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. Once the mortar is launched the on-board GPS . The fuze is set manually to proximity, point detonate, or delay modes. The propelling charge consists of an ignition cartridge and removable propellant increments. 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 L16 81mm mortar is a British standard mortar used by the Canadian Army, British Army and many other armed forces. Notches in the setter engage ribs in the setting ring of the fuze. a. This action breaks an internal sheet pin and internal wire, thereby disabling the proximity function. If not, the cartridge is placed on its side, and the closing plug is removed using an M18 fuze wrench. The gunner can depress the barrel, if necessary, to provide easier access to the firing pin. d. The ammunition is protected from mud, sand, dirt, and water. c. The moisture-resistant seal of the container is broken when the ammunition is to be used. Once set to act as an impact fuze, the mechanism cannot be reset for PROX. 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). This allowed for an excellent sustained rate-of-fire - a maximum rate-of-fire of 30- to -35 rounds per minute was achievable. The fuze wrench, M18, assembles the fuze to the cartridge, and the bladed tip on the end sets PD-type fuzes. The safety/packing clip should be removed when the cartridge is unpacked. 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. Proximity (VT). [1] [2] Many countries use or used an 81 mm mortar in their armed forces. Gunner- The gunner stands to the left side of the mortar where he can manipulate the sight, and gun mechanisms TM 9-1300-251-20&P Artillery Ammunition Maintenance Manual. One-quarter turn on the adjusting nut equals one turn of the traversing handwheel. Mortar Squad, Heavy Weapons Company 1942 - Mortars provide indirect suppressive fire from hidden positions. When cartridges have been prepared for firing, but are not used, all powder increments and safety wires are replaced. All PD fuzes are superquick--detonate on impact. 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 platoon leader commands the platoon and supervises the training of the elements. activities and checks the data!!! Training practice--M879, M880, M68, and sabot. plug, which houses a removable firing pin. *NOMENCLATURECannon M253. If not, he may still fire at the desired range by selecting a charge zone having a higher elevation. When applying the normal safety criteria, at what distance should mortars bed in prior to using the normal minimum range 705m. The mortar is mounted and the sight is installed. Figure 4-4. The ignition cartridge strikes the firing pin and detonates, which causes a flash that passes through the radial holes in the shaft. d. When the barrel reaches the horizontal position, and not before, the assistant gunner moves the thumb of each hand over the muzzle. What you will be learning?How the lesson will be taught?When/how by Michate 26 Jul 2012, 15:00. The explosive elements in primers and fuzes are sensitive to shock and high temperature. Match. Minimum Range is 83 metersB. (The handle of the wrench is turned counterclockwise.) What is the meaning of the common term "Action" ? When set at SQ, the fuze functions on point impact or graze contact. 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. Minimum range in the high-angle indirect fire mode is 80 meters, although some mortars can be aimed horizontally in direct fire, often for final protective fire . Proximity-fuzed short cartridges, which are duds, contain a complete explosive train and impact element. M29A1 81mm Medium Mortar. instrument. 2007 ARMY PROCUREMENT OF AMMUNITION Budget Estimate. Details Facts ML 3-inch (Mark 2 barrel) ML 3-inch (Mark 4 barrel) ML 3-inch (Mark 5 barrel) General Origin United Kingdom Type Mortar Crew The round has a burst height of 600 meters and provides illumination for about 60 seconds for an area of about 1,200 meters. 60mm and 81mm mortar 10. It is especially useful if the baseplate sinks deep into the ground during prolonged firing. (4) The leg-locking handwheel is hand tight. BearerSecond Ammunition Bearer CAPABILITIES/LIMITATIONS OF A 81MM Typical maximum range has been on the order of 3,500 meters, although the M252 81mm Medium Extended Range Mortar, co-developed from a British design, extended the range to 4,500 meters. is sent to the mortar section for a mission and contains all The squad leader stands behind the mortar where he can command and control his squad. "120mm rounds can reach 7,200 meters and the kill radius spans 76 meters in diameter." All mortarmen follow the same . There must not be a visible gap between the fuze and cartridge body. 5700 meters. FM 23-90 Mortars. These fuzes use a clockwork mechanism to delay functioning for a specific time. The corrections for range and lateral spread are ? The fuze is screwed into the cartridge body, and it is seated and secured using an M18 wrench. It is painted white with black markings. The floating firing pin located within the primer has approximately 1/16 of an inch to move around. 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. The squad leader points to the exact spot where the mortar is to be mounted. The fuze arms and functions normally when fired at any angle of elevation between 0800 and 1406 mils at charges 1 through 9. To make the shift, the gunner places the fingers of his right hand in the muzzle and his left hand on the left leg. The cartridge weighs about 9.12 pounds. Minimum Range. The ignition cartridge (with primer) is fitted into the base of the fin shaft. Terms in this set (29) . The maximum effective firing range is 5,700 meters, with a minimum range of 80 meters (that's really close). The M821 HE cartridge (M252 only) is a British-made cartridge fitted with the US M734 multioption fuze. If the round does not fire, the gunner tests the barrel for heat. d. The first ammunition bearer stands to the right rear of the mortar. (4) The bipod locking latch is locked, securing the barrel clamps. During firing, the Normally, it can be moved by hand, although this may be difficult to do if the mortar is moved through a large arc. (6) The primer cartridge is checked for damage or dampness. The safety pull wire is removed just before inserting the cartridge into the mortar. The cannon assembly consists of the The kill radius of the 10-pound HE round is approximately 35 meters. The terms cannon and barrel are used interchangeably in this chapter. When a large number of cartridges are needed for a mission, they may be removed from the containers and prepared. When disposing of unused augmenting cartridges what is the minimum length of safety fuze that should be used ? It is fitted with a safety wire and pin that are removed immediately before firing. Types of rounds, classification, and characteristics for the 81-mm mortar, M29A1 (Standard B for the 81-mm mortar, M252). you will be evaluated?Safety or cease training criteria? . 2004/2005 ARMY PROCUREMENT OF AMMUNITION Budget. There is active work on GPS-guided 81mm mortar shells. b. The mortar squad consists of five men (Figure 4-1). rates of fire for m252a1. The BAD is removed only by qualified maintenance personnel. 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. Gunner- The gunner stands to the left side of the mortar where The 81mm mortar M1 was complemented by the lighter 60mm mortar M2 on the battlefield from 1940. a. c. Crest Clearance. Maximum He places the sight case and aiming posts to the left front of the mortar position. M374, M374A1, M374A2 High Explosive Round Th M374 HE cartridges are painted olive drab with yellow markings and are constructed from pearlitic malleable cast iron. HE ammunition is used against personnel and materiel. b. 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. Mortar, 81mm M1 size Scroll e. The assistant gunner passes the round to the first ammunition bearer who inspects it for the cause of the misfire. 2. a. 4-12. high-explosive bomb at a range of about three miles. After the barrel cools, the gunner removes the sight and firing pin. What is the xi cleft point for the Yang Qiao Mai? He must ensure that the ball-shaped end of the locking rod is secured in its recess by the locking latch. (3) The M256-series fuze has an SQ/IMP function only. Test. The second ammunition bearer retrieves the aiming posts. The M375 cartridge uses the M90 propelling charge while the M375A2 and M375A1 cartridges use the M90A1 propelling charge. The round is still safe to handle and transport if the safety wire is reinserted. Following the arm-and-hand signals of the gunner (who is looking through the sight unit), he moves the far aiming post so that the gunner obtains an aligned sight picture. IM (impact) causes the cartridge to explode on contact. The assistant gunner attempts to maintain the traversing mechanism on a horizontal plane. If the line of sight clears the mask, it is safe to fire. Cartridges assembled with the M532 fuze must be fired above charge 0. (7) When opening an ammunition box, the ammunition bearer ensures the box is horizontal to the ground, not nose- or fin-end up. It contains white phosphorus that produces white smoke on contact with air. 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. 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. b. Its high accuracy and reliability, long range of nearly 6 kilometres, high rate of fire (maximum of 30 long-range rounds/min), lightweight yet rugged construction and ease of carriage by its crew, quick deployment, simplicity of operation and maintenance, great lethality and . b. SQUAD AND SECTION ORGANIZATION AND DUTIES, Each member of the infantry mortar squad has principle duties and responsibilities. what you want. Figure 4-7. The leg-locking handwheel must then be tightened, ensuring the teeth are correctly meshed. (2) The breech plug is screwed tightly to the barrel. It uses the M772 mechanical time fuze and weighs about 10.6 pounds. 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. Then he relocks the barrel clamp. When firing under the control of an FDC, he reports to the FDC that mask clearance cannot be obtained at a certain elevation. c. The assistant gunner disengages the barrel clamps and moves the bipod from the immediate area of the mortar position. a. The ignition cartridge (with primer) is fitted into the base of the fin shaft. Target terrain, such as ice and dry sand, gives lowest burst heights, whereas water and wet ground give highest burst heights. f. The open end of the socket must continue to point in the direction of fire. He ensures that the firing pin recess is facing upwards. This is accomplished by depressing the barrel until the top of the mask is clear. General description, of the Australian 81 mm Improved Mortar Projectile David A. This may preclude moving the bipod. This round must be stored in a vertical position. It comes preset to function on SQ/IMP, and the selector slot should align with the SQ mark on the ogive. e. Care, Handling, and Preservation. "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 standard infantry support weapon is the M-252 81mm mortar, which lobs a 10 lb. (d) Firing is slowed if mask clearance must be checked before each firing but this can be eliminated if minimum mask clearance is determined. The mount consists of elevating and traversing mechanisms and a bipod (Figure 4-4). The M853 and M301A3 illuminating ammunition are described herein. 60mm range from 70 m to 3 1/2 km, and accuracy depends on the spotter calling in the mission and the crew that's laying in In addition to loading, he swabs the bore after 10 rounds have been fired or after each fire mission. *CAPABILITIES/LIMITATIONS OF A 81MM MORTARGun Crew Members. what information. High explosive--M821, M889, M374-series, and M362. The M374A2 and M374A1 cartridges are fitted with the M90A1 propelling charge. It is light enough to be portable when broken down into its . The leg-locking handwheel must then be tightened by hand, ensuring the teeth on either side are correctly meshed. This unit Last updated: 10-MAY-2006: Added M879. The cartridge is painted light green and has red markings and one narrow yellow band. *Question: What is the maximum range for the M252 81mm Maximum effective range. He indicates the initial direction of fire by pointing in that direction and commands ACTION. a. This ensures that the mortar does not fire should the round slip down the barrel during the subsequent drills. If it gets wet or dirty, it must be wiped off at once. It can be set from 3 to 55 seconds at half-second intervals. What is the danger and lethal areas of the 81mm HE round ? noise.B.A.D.Removable Breech Plug Firing PinUpper Stopping M64A1 Sightunit. Shortly before midnight on July 12, 1970, Alpha Company of the 2nd Battalion, 501st Airborne Infantry Regiment, detected movement about 200 meters below its landing zone on a hill. (2) The M84 fuze is a single-purpose, powder-train, mechanical-time fuze used with the 81-mm M301A1 and M301A2 illuminating cartridges. minimum range for m252a1. The following are authorized (Standard B) cartridges for the 81-mm mortar, M252: Each cartridge has fins around the tail to stabilize it in flight and to cause it to strike fuze-end first. They should not be approached for 5 minutes or disturbed for at least 30 minutes after firing. The fuze threads and fuze well threads are inspected for damage. It is assembled with the M772A1 MTSQ. If required, the gunner/assistant gunner lowers the barrel so that the breech plug engages with the open end of the socket, and he uses the barrel as a lever to move the socket. What restrictions are to be enforced during training when firing rate 12, What should a MFC know before crossing the line of departure, What are the consideration when sighting an op, What two things could happen if the MFC doesn't check the belt, List the 4 options the MFC has to correct a incorrect belt, The aim of adjustment is to obtain an accurate charge bearing and elevation to a target with minimum expenditure of time and ammo so that effective fire can be brought to bear on to the target, List the MFC considerations before adjustment, MFC considerations before fire for effect. First Ammunition d. The gunner rough levels the cross-level bubble by making the bubble bounce from one side to the other. The M751 is fitted with a smoke charge that operates on impact. The vertical cross line of the sight is on the left edge of the aiming point. b. The gunner unlocks the barrel clamp and rotates the barrel, unlocking the breech plug from the rotating socket of the baseplate. An internal clock mechanism provides nine seconds of safe air travel (610 to 2,340 meters along trajectory for charge 0 through 9, respectively). The fuze arms and functions normally when fired at any angle of elevation between 0800 and 1406 mils at charges 1 through 9. (See FM 7-90 for a discussion of the duties of the platoon headquarters.). 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. The gunner removes the sight and places it in the case with 3200 deflection and 0800 elevation indexed. Correct way to open an ammunition box. End this starting train with not less than 1 meter of inert material (dry grass, leaves, or newspapers). In conjunction with the Mark 5 barrel the lighter square No.5 baseplate is used, as is the Mk 2 sight unit. The M816 81mm Infrared Illumination Cartridge with Mechanical Time - Super Quick (MTSQ) Fuze is designed for use with the M252 81mm Light Battalion Mortar System, currently fielded to all Light Infantry units in the Army. d. Multioption. Embed Size (px) Firing tables are used to determine the correct charge for firing. c. The M374A3 HE cartridge is constructed from pearlitic malleable cast iron and contains about 2.10 pounds of composition B explosive. Learn vocabulary, terms, and more with flashcards, games, and other study tools. 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. c. The first ammunition bearer checks the barrel and ensures that--. (c) The gunner determines mask and overhead clearance by sighting along the barrel with his eye near the breech plug. However, at temperatures above 32 degrees Fahrenheit and at angles greater than 1068 mils, the flight time is sufficient to permit arming. At the muzzle end is a cone-shaped blast attenuator device (BAD) that is fitted to reduce noise. Red phosphorus/white phosphorus--M819 and M375-series. It should be destroyed in accordance with standard procedures. 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. PRX (proximity) causes the cartridge to explode between 3 and 13 feet above the ground. It has two types: type 1 resembles the M734 fuze, and type 2 resembles the M935 fuze. g. The barrel clamps can be moved along the barrel to counter large changes in elevation. Rapid Rate = 30 rounds per min for 2 (Section)Shell and Fuze(HE Quick)Mortar to Fire(Gun 2 in The fuze has a safety wire that must be removed before firing. If the primer is not dented, the round may be used again. 19. MoCaP Meets Mission Need Can be, 1 Lecture #18 Masonry Cement and Mortar. The gunner should expose 6 inches (150 millimeters) of elevation shaft and center the buffer carrier. a. a. 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. TM 9-1315-252-12&P M880 SRTR Manual. This page was last modified 01:37, 11 August 2010. The range of any given mortar's projectiles can be adjusted by the user. The E44-E mortar incorporates features of modern requirements and is capable of firing all types of 81 mm mortar rounds. The weapon is fired by dropping the shell into the muzzle, such that it falls and hits the firing pin. The M889 HE cartridge (M252 onlyXUS Marine Corps) is of the same construction as the M821 cartridge in every detail except the fuze, which is the M935. LARGE DEFLECTION AND ELEVATION CHANGES. He then checks the sight picture to ensure he is within 20 mils of a proper sight picture. Safety before firing is provided by a safety wire, which must be removed just before firing. The ignition cartridge strikes the firing pin and detonates, which causes a flash that passes through the radial holes in the shaft. The fuze setter, M25, sets M84-series time fuzes. Minimum and maximum range for a 120mm model are similar to the Future Indirect Fire Turret. a. Point-Detonating. If the situation allows for a longer waiting period, the dud can be considered safe for handling after 40 hours. Since phosphorus liquefies at about 100 degrees Fahrenheit, the ammunition is protected against an uneven rehardening of the filler. adjust)Method of Fire(Section 3 rnds in 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. Ranger of the 1st Ranger Battalion firing an M2 60mm mortar , World War II. The High Explosive 81mm mortar bomb L41 series is fitted with the Mk4 Charge System and employ a spheroidal cast iron bomb body, which combined with a high energy explosive filling, provides optimised fragmentation. The 81mm mortar rounds are designed for use with the M252 81mm Light Battalion Mortar System, currently fielded to all Light Infantry units in the U.S. armed forces. Disposal Precautions. The M2 is a more "portable" piece of equipment, capable of effective indirect fire at close range and capable of operating closer to frontline infantry action, with portability being a major selling point. If the barrel is hot, the gunner may then apply water to the outside of the barrel until it is cool. The mortar should be within two turns of center of traverse when the task is compete. --M4 exclusive side armor. Safety before firing is provided by a safety wire, which must be removed just before firing. Standard ammunition types include high explosive, illuminating, smoke and practice. The fuze is not intended to function at charge 0. M252a1 max range. They use the M5 propelling charge that consists of eight cloth bags attached to the tail unit. (2) The M524-series fuze has two function settings: superquick/impact (SQ/IMP) and delay. This section discusses the. REFERRING OF THE SIGHT AND REALIGNMENT OF AIMING POSTS USING M64 SIGHT. . "81mm rounds have a maximum effective range of 5,608 meters," said Leininger. It is set using the bladed end of the M18 fuze wrench. (3) The M84A1 fuze is a single-purpose, tungsten-ring, mechanical-time fuze used with the 81-mm M301A3 illumination cartridge. It provides illumination for about 60 seconds with 600,000 candlepower illumination. (1) The rotating socket is free to move in a complete circle. Cartridges assembled with the M524 (A1, A2, A3, or A4) fuze are for use by the US Marine Corps and US Navy only. The squad leader indicates the direction of fire when mounting. If, upon removal of the safety wire, a buzzing sound in the fuze is heard, the round should not be used. The tabulated data of the 81-mm mortar, M252, are shown in Table 4-1. It uses the M205 propelling charge, consisting of four horseshoe-shaped increments fitted around the tail. A modern mortar is a weapon that provides short-range indirect fire at high angles, usually between 45 and 80 degree. The bearing along which mortar barrels point when they first come into action, it is the bearing at which bearing scales are adjusted and is generally in the rough direction of the target or grid reference given to bring the mortars in action, Answer the following questions regarding the L54 illuminating round. These cartridges are used first in subsequent firing so that once-opened stocks can be kept to a minimum. The gunner places the announced deflection on the sight (without disturbing the lay of the weapon) and looks through the sightunit. All elements given in the fire command are repeated by the squad. The principal factors affecting height of burst are the angle of approach to the target and the reflectivity of the target terrain. b. e. The squad leader picks up the aiming posts and sight. https://citizendium.org/wiki/index.php?title=81mm_mortar&oldid=745029, Creative Commons-Attribution-ShareAlike 3.0 Unported license, Creative Commons Attribution-NonCommercial-ShareAlike. Copyright 2006 Gary W. Cooke The M1 collapsable design made it portable but at 45pounds per piece made it difficult to move. 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. Created by. MORTAR, CAPABILITIES /LIMITATIONSFire Commands- Technical instructions The safety pull wire is removed just before inserting the cartridge into the mortar. He makes large deflection shifts by shifting the bipod assembly and keeps the bubbles level during firing. The United Kingdom's L16 81 mm mortar is the standard mortar used by the British armed forces. Explanations. To prepare for firing, the slot is aligned in the striker with SQ or delay using the M18 fuze wrench. The cartridge is dropped down the barrel, fin-end first. Ammunition Lot Number. M3A1 Baseplate The mortar is then re-laid on the aiming posts using the traversing crank. Each round is stenciled with the ammunition lot number, type of round, type of filler, and caliber. Normal minimum range = 550m 705m. No tools are needed to set the fuze, and the setting can be changed several times without damaging the fuze. At the same time, the first ammunition bearer moves out on the double to realign the aiming posts. MechanismTraversing MechanismMechanical LegFixed Leg Barrel The maximum effective firing range is 5,700. Table 4-2. The entire unit weighs 91 pounds. The 60mm M57 mortar has a minimum range of 74m and maximum 2537m with the M73 shell. The M375A3 cartridge is ballistically similar to the M374A3 (HE) cartridge. Red phosphorus/white phosphorus is used for screening, producing casualties, creating incendiary effects, and signaling.
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