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To set for delay, the selector slot should be rotated clockwise until it is aligned with the "D" mark on the ogive. Range - 5,375m (when fired from either a ground or . Minimum Range. He is also the squad driver. He makes large deflection shifts by shifting the bipod assembly and keeps the bubbles level during firing. The cartridge is painted light green and has red markings and one narrow yellow band. Mortar Squad, Mechanized Cavalry Troop 1942 - Mortars provide indirect suppressive fire from hidden positions. The round is used to illuminate targets during night operations. Training practice--M879, M880, M68, and sabot. The entire squad stays with the mortar. b. Ranger of the 1st Ranger Battalion firing an M2 60mm mortar , World War II. 4-12. It is an 81mm high-angle-of-fire system that is crew-served, entering US Army service in 1987. 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. 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 exposes 4 inches (100 millimeters) of elevation shaft and folds the handle. It is constructed from ductile cast iron and contains about 1.5 pounds of cyclonite (RDX)/trinitrotoluene (TNT) composition explosive. Red phosphorus/white phosphorus--M819 and M375-series. Figure 4-7. activities and checks the data!!! The smoothbore, muzzle-loading M252 medium weight mortar system offers up accurate long-range indirect fire support to American ground forces. "120mm rounds can reach 7,200 meters and the kill radius spans 76 meters in diameter." [Weapons 101] How does a Mortar work? The standard infantry support weapon is the M-252 81mm mortar, which lobs a 10 lb. The equipment is placed out the same as for the gunner's examination (Chapter 9). 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. Company commander Chuck Hawkins ordered his forward observer to engage the enemy with mortar fire. Safety before firing is provided by a safety wire, which must be removed just before firing. 2. The BAD is removed only by qualified maintenance personnel. 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. "81mm rounds have a maximum effective range of 5,608 meters," said Leininger. In addition to supervising the emplacement, laying, and firing of the mortar, he supervises all other squad activities. With the mortar mounted and the sight installed, the gunner lays the sight on the 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. b. The E44-E mortar incorporates features of modern requirements and is capable of firing all types of 81 mm mortar rounds. laying, and firing of the mortar, he supervises all other squad All PD fuzes are superquick--detonate on impact. CharacteristicsRanges:A. 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 cone-shaped blast attenuator device (BAD) that is fitted to reduce Mount The ignition cartridge strikes the firing pin and detonates, which causes a flash that passes through the radial holes in the shaft. (4) The bipod locking latch is locked, securing the barrel clamps. To set for delay, the selector slot should be rotated clockwise until it is aligned with the "D" mark on the ogive. The ignition cartridge has a percussion primer and is assembled to the end of the fin assembly. What you will be learning?How the lesson will be taught?When/how The gunner is given an administrative command to lay the mortar on a deflection of 2860 or 2740 mils. The range of any given mortar's projectiles can be adjusted by the user. b. The fuze body is graduated from 0 to 25 seconds in 1-second intervals; 5-second intervals are indicated by bosses. Model and statue. The cartridge weighs about 9.4 pounds. The M734 multioption fuze is the only one used with the 81-mm mortar. (c) The gunner determines mask and overhead clearance by sighting along the barrel with his eye near the breech plug. The ammunition that can be fired by the 81-mm mortar, M252, is identified and described herein. c. The assistant gunner disengages the barrel clamps and moves the bipod from the immediate area of the mortar position. 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 bomb is approved for use with both proximity and point detonating fuzes. SMALL DEFLECTION AND ELEVATION CHANGES. *Question: What is the maximum range for the M252 81mm 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. Notches in the setter engage ribs in the setting ring of the fuze. (4) The blast attentuator device is secured correctly. An ammunition lot number is assigned to each ammunition lot, which is marked on each cartridge and packing container. M3A1 Baseplate The maximum rate of fire is up to 30 rounds per minute and the duration is up to 2 minutes. At the muzzle end is a cone-shaped blast attenuator device (BAD) that is fitted to reduce noise. Red phosphorus cartridges (M252 only) are stored the same as HE cartridges. The traversing screw assembly is fitted to the clamp assembly, which is pivoted in the center on an arm attached to the elevating leg. The cannon assembly consists of the f. If the above procedure fails to remove the misfire, the barrel must be kept horizontal. If not, he may still fire at the desired range by selecting a charge zone having a higher elevation. e. The M362A1 and M362 HE cartridges are of steel forge construction and contain about 2.10 pounds of composition B explosive. Created by. The explosive elements in primers and fuzes are sensitive to shock and high temperature. Safety before firing is provided by a safety wire, which must be removed just before firing. It is assembled with the M772A1 MTSQ. When firing under the control of an FDC, he reports to the FDC that mask clearance cannot be obtained at a certain elevation. This may preclude moving the bipod. TM 9-1300-251-20&P Artillery Ammunition Maintenance Manual. This section implements STANAG 2321 and QSTAG 900 (Edition 1). This is accomplished by depressing the barrel until the top of the mask is clear. To make the shift, the gunner places the fingers of his right hand in the muzzle and his left hand on the left leg. MechanismTraversing MechanismMechanical LegFixed Leg Barrel A spring-loaded locating catch is behind the elevating gear housing, which locates the plain leg in its supporting position for level ground. The fuze wrench, M18, assembles the fuze to the cartridge, and the bladed tip on the end sets PD-type fuzes. c. The M375A2, M375A1, and M375 cartridges may also be used. Since phosphorus liquefies at about 100 degrees Fahrenheit, the ammunition is protected against an uneven rehardening of the filler. The fuze has a safety wire that must be removed before firing. e. The assistant gunner passes the round to the first ammunition bearer who inspects it for the cause of the misfire. c. The assistant gunner moves into position to the front of the bipod on his right knee and grasps the bipod legs (palms up), lifting until they clear the ground enough to permit lateral movement. The sight bracket is attached to the buffer carrier, which is fitted to the traversing screw assembly. The gunner checks the baseplate and ensures that--. If the barrel is cool enough to handle, the crew removes the round as described below. 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. e. The second ammunition bearer stands to the right rear of the mortar behind the ammunition bearer. 81mm smoothbore mortar Barrel length 1.28 m Muzzle velocity 225 m/s Elevation +45 to +85 Traverse 18 Fire control Sights C2 indirect fire sight with illumination Firepower Rate of fire 20 rpm maximum 15 rpm normal 1 to 12 rpm sustained Range 5.650 m maximum 100 m minimum Media 81mm L16A2 There must not be a visible gap between the fuze and cartridge body. Once set to act as an impact fuze, the mechanism cannot be reset for PROX. They are assembled with either an M524-series, M526-series, or M567 fuze. The United Kingdom's L16 81 mm mortar is the standard mortar used by the British armed forces. First Ammunition If the barrel is hot, the gunner may then apply water to the outside of the barrel until it is cool. The gunner is given a deflection change in a fire command between 20 and 60 mils inclusive. 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 . 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. The M301A3 cartridge has a cylindrical body that contains an illuminating candle and parachute assembly. In conjunction with the Mark 5 barrel the lighter square No.5 baseplate is used, as is the Mk 2 sight unit. High explosive--M821, M889, M374-series, and M362. Several types of RP/WP ammunition are described herein. Both the M90 and M90A1 propellants are in nine wax-tested, cotton cloth, bag increments assembled to the tail unit. Army engineers say that, in general, a typical 81mm mortar would generate up to 10,000 pounds of recoil force, while the active-recoil enabled ADIM only produces a maximum of 2,000 pounds. What is the meaning of the common term "First Bearing" ? Standard A ammunition for the M29A1 mortar is Standard B for the M252 mortar (, Light green Yellow band with red markings. It uses the M219 propelling charge and weighs about 9.1 pounds. Start studying m252A1 81mm Mortar. Trenches are dug to prevent water from flowing under the pile. However, at temperatures above 32 degrees Fahrenheit and at angles greater than 1068 mils, the flight time is sufficient to permit arming. Target terrain, such as ice and dry sand, gives lowest burst heights, whereas water and wet ground give highest burst heights. e. Dummy. The assistant gunner cleans the bore and swabs it dry. The M252 replaced the older 81mm M29 mortar and is in service with the U.S. Terms in this set (29) . System (including basic issue items) With the clamps facing away from him, the assistant gunner traverses the buffer carrier to the traversing handwheel and folds the handle. He levels all bubbles. It comes preset to function on SQ/IMP, and the selector slot should align with the SQ mark on the ogive. by Michate 26 Jul 2012, 15:00. The contents of ammunition containers are shown by markings. TM 9-1015-200-10 M29A1 Operator's Manual. Before the mortar is mounted, the squad must perform premount checks. --81mm mortar mount base. When fired, the cartridge carries the ignition cartridge with it, leaving the mortar ready for the next cartridge. noise.B.A.D.Removable Breech Plug Firing PinUpper Stopping The sustained rate of fire is 15 rounds per minute indefinitely. A safety latch located at the side of the recess is used to secure the ball. (2) The ribs and braces have no breaks, cracks, or dents. The section leader, acting as FDC, has one deflection instead of two or more. 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. He lays for deflection, taking the proper sight picture. When a misfire occurs, any member of the squad immediately announces, "Misfire." The propellant increments are ignited, which produce rapidly expanding gases that force the cartridge from the barrel. B-GL-385-017/PT-001 Weapons 81 mm Mortar is issued on the authority of the Chief of the Land Staff. Propelling charges are covered or protected from dampness or heat. When fired, the cartridge carries the ignition cartridge with it, leaving the mortar ready for the next cartridge. 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. It has a time setting of up to 25 seconds. members of a 81mm mortar gun crew include: Squad Leader- In addition to supervising the emplacement, 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 fuze is screwed into the cartridge body, and it is seated and secured using an M18 wrench. Table 4-3. If, upon removal of the safety wire, a buzzing sound in the fuze is heard, the round should not be used. b. The fuzes may be used for day or night operations. Weight (Complete System) 89 pounds (40.41 kilograms) Bore diameter. Proximity fuzes withstand normal handling without danger of detonation or damage when in their original packing containers or when assembled to projectiles in their packing containers. The fuze consists of a brass head, body assembly, and expelling charge. The assistant gunner attempts to maintain the traversing mechanism on a horizontal plane. The fuze arms and functions normally when fired at any angle of elevation between 0800 and 1406 mils at charges 1 through 9. 5. "81mm rounds have a maximum effective range of 5,608 meters," said Leininger. breech plug on the barrel is sealed and locked to the rotatable Range is adjusted by removing "increments", or packets of propellant, around the base fins. Minimum and maximum range for a 120mm model are similar to the Future Indirect Fire Turret. More uniform firing is obtained if ammunition is kept at the same temperature. (7) When opening an ammunition box, the ammunition bearer ensures the box is horizontal to the ground, not nose- or fin-end up.
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