The assistant gunner attempts to maintain the traversing mechanism on a horizontal plane. In charge was the platoon commander - normally a lieutenant. b. 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. 4-11. d. Multioption. This round may be stored in a horizontal position. high-explosive bomb at a range of about three miles. Figure 4-7. (e) If the mask is not regular throughout the sector of fire, the gunner determines the minimum mask clearance as described above. However, at temperatures above 32 degrees Fahrenheit and at angles greater than 1068 mils, the flight time is sufficient to permit arming. d. The gunner rough levels the cross-level bubble by making the bubble bounce from one side to the other. The M252 medium mortar offers a compromise between the light and heavy mortars. (2) The M524-series fuze has two function settings: superquick/impact (SQ/IMP) and delay. This section implements STANAG 2321 and QSTAG 900 (Edition 1). Cartridges assembled with the M532 fuze must be fired above charge 0. The body is made of aluminum and brass. News. MORTAR RANGE: 500M X 100M X: FIELD TRAINING AREA 40000 Sq Ft: X STORAGE BUILDING, GENERAL PURPOSE, INSTALLATION: Area to store excess equipment X: ORGANIZATIONAL STORAGE BUILDING Arms room for Mortar equipment: X . In addition to loading, he swabs the bore after 10 rounds have been fired or after each fire mission. e. The second ammunition bearer stands to the right rear of the mortar behind the ammunition bearer. d. When the barrel reaches the horizontal position, and not before, the assistant gunner moves the thumb of each hand over the muzzle. In any case, the gunner must ensure that the cartridge does not strike an obstacle. b. 120mm IHE grenade DM91. Attached to the right of the screw is the traversing handwheel. This may preclude moving the bipod. He stands to the rear of the baseplate and supports the barrel until the bipod is fitted. (5) Four inches of elevation shaft are exposed, and the shaft is not bent. It is constructed from ductile cast iron and contains about 1.5 pounds of cyclonite (RDX)/trinitrotoluene (TNT) composition explosive. .30 BROWNING, M1917 AND M1917A1; GUN, MACHINE, CAL. a. Point-Detonating. e. The gunner centers the elevation bubble. 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. 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 mortar is within two turns of center of traverse. The cartridge uses the M205 propelling charge and is assembled with the M567 or M524-series fuze. e. The M362A1 and M362 HE cartridges are of steel forge construction and contain about 2.10 pounds of composition B explosive. The fuze threads and fuze well threads are inspected for damage. Notches in the setter engage ribs in the setting ring of the fuze. The company level vehicles also carry a vehicle-mounted 120mm mortar, which is augmented by the 60mm M224 mortar for dismounted use. When set at SQ, the fuze functions on point impact or graze contact. HE ammunition is used against personnel and materiel. (2) The barrel is locked to the baseplate, and the open end of the socket points in the direction of fire. The cartridge must not be fired below charge 3. The M821 HE cartridge (M252 only) is a British-made cartridge fitted with the US M734 multioption fuze. The Mark 4 and 5 barrels were introduced during World War 2 and have a much increased range. General Dynamics Ordnance and Tactical Systems is the leading manufacturer of propellants for 60mm, 81mm and 120mm Mortar Systems. 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. It uses the M219 propelling charge and weighs about 9.1 pounds. He must not stand directly behind the mortar. The American M1 81mm Mortar, like the upcoming M2 60mm Mortar, was based on a French design by Edgar William Brandt (1880-1960). (The handle of the wrench is turned counterclockwise.) a. Before-firing checks include the following: (1) Ammunition should be free of moisture, rust, and dirt. It uses the M205 propelling charge, consisting of four horseshoe-shaped increments fitted around the tail. DESCRIPTION. REFER DEFLECTION TWO EIGHT SEVEN FIVE (2875), REALIGN AIMING POSTS. M224A1 60 MM LWCMS Mortar The 60mm mortar, M224A1 Lightweight Company Mortar System (LWCMS), is a smoothbore, muzzle loaded, high angle of fire weapon. MFCS Mounted. He exposes 4 inches (100 millimeters) of elevation shaft and folds the handle. Bear in mind that these are my personal opinions, experiences, and . The cartridge is painted olive drab with yellow markings. M3A1 Baseplate Figure 4-4. Table 4-1. The RSTA squadron only receives the 120mm mounted mortar, there is no augmentation dismounted maneuvers. It is used for records such as reports on condition, malfunctions, and accidents. The fuze wrench, M18, assembles the fuze to the cartridge, and the bladed tip on the end sets PD-type fuzes. Upon completion of any bipod movement on the barrel, the gunner ensures that the firing pin recess is facing upward. 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. d. The M374A2, M374A1, and M374 HE cartridges are painted olive drab with yellow markings and are constructed from pearlitic malleable cast iron. f. Installation. The ignition cartridge (with primer) is fitted into the base of the fin shaft. (7) When opening an ammunition box, the ammunition bearer ensures the box is horizontal to the ground, not nose- or fin-end up. This action breaks an internal sheet pin and internal wire, thereby disabling the proximity function. (c) The gunner determines mask and overhead clearance by sighting along the barrel with his eye near the breech plug. The 60mm mortar section is located in the weapons platoon of the rifle company, is armed with three 60mm mortars, and is The fuze has a safety wire that must be removed before firing. Table 4-3. The fuze setter, M25, sets M84-series time fuzes. The striker has been modified to be able to use German and Italian patterns of 81mm mortar . After the barrel cools, the gunner removes the sight and firing pin. If the round fires, the mortar is re-laid on the aiming point and firing is continued. The M853 cartridge (M252 only) has a cylindrical body that contains an illuminating candle and parachute assembly. If, upon removal of the safety wire, a buzzing sound in the fuze is heard, the round should not be used. 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 . b. c. The gunner grasps both ends of the traverse screw assembly and supports the mortar during the subsequent drill. ), 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). The mount consists of elevating and traversing mechanisms and a bipod (Figure 4-4). To set for delay, the selector slot should be rotated clockwise until it is aligned with the "D" mark on the ogive. (See FM 7-90 for a discussion of the duties of the platoon headquarters.). The aluminum tail assembly has six integral fins equally spaced around the rear, which stabilize the round in flight. These propellants are flash-suppressed and clean burning resulting in minimum residue, flash and blast overpressure. Section I. f. If the above procedure fails to remove the misfire, the barrel must be kept horizontal. (4) The leg-locking handwheel is hand tight. The gunner places the outer edge of the baseplate against the baseplate stake so that the left edge of the cutaway portion of the baseplate is aligned with the right edge of the stake (Figure 4-7). 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. [1] [2] Many countries use or used an 81 mm mortar in their armed forces. All mortar cartridges are painted to prevent rust and to identify their type. The cartridge is painted light green and has red markings and one narrow yellow band. The contents of ammunition containers are shown by markings. All rounds are colored according to their type. f. The open end of the socket must continue to point in the direction of fire. The first ammunition bearer puts both hands on the cooling fins under the barrel and slowly lifts the barrel until it is horizontal. b. 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 . h. Where the ground is uneven and there is no level surface for the bipod, the gunner can adjust the plain leg. To dismount the mortar, the squad leader commands, OUT OF ACTION. If the primer of the ignition cartridge is dented, the first ammunition bearer attempts to replace the safety wire and places the round in a marked, safe location for disposal by ordnance personnel. d. The first ammunition bearer stands to the right rear of the mortar. This document (FT 81 B3, abridged) consists of two pages, each with a separate table. The tabulated data of the 81-mm mortar, M252, are shown in Table 4-1. (5) Do not leave unused increments unburned in combat operational areas. 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 . Ammunition is typed according to use (Table 4-2). After the mortar is mounted, the gunner makes a thorough check. It is painted white with black markings. The air burst over average types of soil ranges from 1 to 6 meters, depending on the angle of approach. b. They should not be approached for 5 minutes or disturbed for at least 30 minutes after firing. 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. The second ammunition bearer retrieves the aiming posts. It has a time setting of up to 25 seconds. 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. 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. He then checks the sight picture to ensure he is within 20 mils of a proper sight picture. (4) Extra increments are removed if the cartridge is to be fired with less than full charge. He maintains the ammunition for firing and provides local security for the mortar position. This ensures that the mortar does not fire should the round slip down the barrel during the subsequent drills. This is accomplished by depressing the barrel until the top of the mask is clear. Training practice is used only for training. 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. b. 4-12. d. The gunner recovers the baseplate to the area designated by the squad leader. When firing under the control of an FDC, he reports to the FDC that mask clearance cannot be obtained at a certain elevation. 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. The wrench (P/N 9349539) sets M772 MT and M768 time fuzes. c. The elevating shaft is contained in the elevating leg; to the left of the elevating leg is the elevating handwheel. It has no safety pins or wires to reduce preparation time. MFCS Dismounted. a. These fuzes use a clockwork mechanism to delay functioning for a specific time. He places firing data on the sight and lays the mortar for deflection and elevation. News. (2) The fin and fuze assembly must be checked for tightness and damage. (2) The ribs and braces have no breaks, cracks, or dents. 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 fuze contains a delayed arming feature that ensures the fuze remains unarmed and detonator safe for a minimum of 1.25 seconds of flight. Theme by TechDoc. Proximity (VT). Disposal Precautions. on Amazon.com. The lower clamp is shaped and bored on each side to house the buffer cylinders. 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. They contain about 2.10 pounds of composition B explosive. He levels all bubbles. The 81-mm mortar, M252, is a smooth-bore, muzzle-loaded, high-angle-of-fire weapon. The mortar is then re-laid on the aiming posts using the traversing crank. (4) The blast attentuator device is secured correctly. It is light enough to be portable when broken down into. The M252 is highly accurate up to ranges of 4500m to 5700m depending on the The M734 multioption fuze is the only one used with the 81-mm mortar. This round must be stored in a vertical position. He may assist the gunner in shifting the mortar when the gunner is making large deflection changes. .50: BALL, M2 (S&I BY PROP SEE DETAILS, FOOTNOTES), FIRING TABLES FOR WEAPON, 5.56MM, M16A1 WEAPON, 5.56MM, M16A2 WEAPON, 5.56MM, M249 AND WEAPON, 5.56MM, M4 FIRING CARTRIDGE, BALL, M855 CARTRIDGE, TRACER, M858 CARTRIDGE, BALL, M193 CARTRIDGE, TRACER, M196 (S&I BY PROP SEE DETAILS, FOOTNOTES), MACHINE GUN, 7.62-MM: M60 ON MOUNT, MACHINE GUN: 7.62-MM, M122 AND MACHINE GUN, 7.62-MM: M73 ON TANK, COMBAT, FULL-TRACKED: 105-MM GUN, M60 SERIES AND RIFLE, 7.62-MM: M14; FIRING CARTRIDGE, 7.62-MM, BALL, NATO, M59; CARTRIDGE, 7.62-MM, BALL, NATO, M80; CARTRIDGE, 7.62-MM: AP, NATO, M61 AND CARTRIDGE, 7.62-MM: TRACER, NATO, M62 (REPRINTED W/BASIC INCL C1) (S&I BY PROP SEE DETAILS, FOOTNOTES), ADDENDUM TO FT 8-Q-1 FOR PROJECTILE, HE, M404 (S&I BY PROP SEE DETAILS, FOOTNOTES), ADDENDUM TO FT 8-J-4 FOR PROJECTILE, HE, M404 (S&I BY PROP SEE DETAILS, FOOTNOTES), ADDENDUM TO FT 8-T-1 FOR PROJECTILE, HE: M509A1 (S&I BY PROP SEE DETAILS, FOOTNOTES), CANNON, 8-INCH HOWITZER, M201A1 ON HOWITZER, HEAVY, SELF-PROPELLED, 8-INCH, M110A2 FOR LOW ANGLE FIRING PROJECTILE, HE, M509A1 USING REGISTRATION DATA FOR PROJECTILE, HE, M106 (S&I BY PROP SEE DETAILS, FOOTNOTES), CANNON, 8-INCH HOWITZER: M2 AND M2A1 ON HOWITZER, HEAVY, TOWED: 8-INCH, M115; CANNON, 8-INCH HOWITZER: M47 ON HOWITZER, HEAVY, SELF-PROPELLED, FULL TRACKED: 8-INCH, M55; CANNON, 8-INCH HOWITZER: M2A1E1 ON HOWITZER, HEAVY, SELF-PROPELLED: 8-INCH, M110; FIRING PROJECTILE, HE: M106 AND PROJECTILE, CHEMICAL: M426 (S&I BY PROP SEE DETAILS, FOOTNOTES), CANNON, 8-INCH HOWITZER, M201 ON HOWITZER, HEAVY, SELF-PROPELLED: 8-INCH, M110A1 AND CANNON, 8-INCH HOWITZER, M201A1 ON HOWITZER, HEAVY, SELF-PROPELLED: 8-INCH, M110A2 AND FIRING PROJECTILE, HE, M106 PROJECTILE, CHEMICAL, M426 (S&I BY PROP SEE DETAILS, FOOTNOTES), CANNON, 8-INCH HOWITZER: M201A1 ON HOWITZER, HEAVY, SELF-PROPELLED, 8-INCH, M110A2; FIRING PROJECTILE, HE, RA; M650 AND PROJECTILE, ATOMIC: M753 AND M753A1 (S&I BY PROP SEE DETAILS, FOOTNOTES), CANNON, 8-INCH HOWITZER, M201A1 ON HOWITZER, HEAVY, SELF-PROPELLED: 8-INCH, M110A2 FIRING PROJECTILE, HE, M509A1 (S&I BY PROP SEE DETAILS, FOOTNOTES), CANNON, 14.5-MM GUN, M31; ARTILLERY TRAINER FIRING FUZED CARTRIDGES, M181, M182 AND M183 (S&I BY PROP SEE DETAILS, FOOTNOTES), GUN, 20-MM, AUTOMATIC, M139; FIRING CARTRIDGE, 20-MM, HEIT, M599; CARTRIDGE, 20-MM, TPT, M206 AND CARTRIDGE, 20-MM, APIT, M601 (S&I BY PROP SEE DETAILS, FOOTNOTES), FIRING TABLES FOR CANNON, 25MM GUN, M242 ON INFANTRY FIGHTING VEHICLE, M3 FIRING CARTRIDGE, APDS-T, M791 CARTRIDGE, HEI-T, M792 CARTRIDGE, TP-T, M793 CARTRIDGE, TPDS-T, M910 (S&I BY PROP SEE DETAILS, FOOTNOTES), GUN, AUTOMATIC, 40-MM, M1 AND GUN, DUAL AUTOMATIC, 40-MM, M2; FIRING CARTRIDGE, HE-T, SD, MK 2 WITH FUZES, PD, MK 27, M64A1, M71 OR NO.

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