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. (4) Extra increments are removed if the cartridge is to be fired with less than full charge. Short cartridges can be expected when firing below charge 4. Correctly applying and performing these duties enables the mortar section to perform as an effective fighting team. 0.50, BROWNING, M2; FIRING CARTRIDGE, ARMOR-PIERCING-INCENDIARY, CAL. Barrel (with blast attenuator device)
(2) Color code. They contain about 2.10 pounds of composition B explosive. Cartridges assembled with the M524 (A1, A2, A3, or A4) fuze are for use by the US Marine Corps and US Navy only. b. 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. Additionally, they carry the 81mm M252 mortar that can only be used in a dismounted capacity. He positions the lower barrel clamp against the lower stop band on the barrel and secures the upper barrel clamp. c. After the gunner has announced, "Up," the squad leader should check the mortar to determine if the exercise was performed correctly. 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. b. After the mortar is mounted, the gunner makes a thorough check. The types of fuzes described in this paragraph are point detonating, proximity, mechanical time, multioption, and dummy. High explosive--M821, M889, M374-series, and M362. 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. M120/M121 120 mm Mortar. System (including basic issue items)
Illuminating is used for battlefield illumination and signaling. When the approximate alignment is completed, the gunner signals the assistant gunner to lower the bipod by pushing down on the mortar. This section discusses the. (The handle of the wrench is turned counterclockwise.) If the situation allows for a longer waiting period, the dud can be considered safe for handling after 40 hours. News. Fuzes are not disassembled. XM1210. These are NDI items . Red phosphorus/white phosphorus is used for screening, producing casualties, creating incendiary effects, and signaling. 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. A plain leg is fitted to a stud on the elevating leg and is secured by a leg-locking handwheel. Proximity (VT). 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 . High angles of approach (near vertical) give the lowest burst heights. This round must be stored in a vertical position. Burst Height. 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. With the clamps facing away from him, the assistant gunner traverses the buffer carrier to the traversing handwheel and folds the handle. (4) The M567 fuze is an impact fuze that has a SQ/IMP or D function. Notches in the setter engage ribs in the setting ring of the fuze. The cannon has a crew-removable breech plug and firing pin. a. Each round is stenciled with the ammunition lot number, type of round, type of filler, and caliber. FT 81-AI-3 Firing Tables Mortar, 81mm: M28A1 and M29 Mortar 81mm Self propelled M125A1 and M125 Carrier, 81mm Mortar Tracked XM755 [US Army.] 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. (2) The barrel is locked to the baseplate, and the open end of the socket points in the direction of fire. This ensures a maximum traversing and elevating capability after making the movement. d. The M374A2, M374A1, and M374 HE cartridges are painted olive drab with yellow markings and are constructed from pearlitic malleable cast iron. When firing under the control of an FDC, he reports to the FDC that mask clearance cannot be obtained at a certain elevation. Army Publishing Directorate
Both legs are fitted with a disk-shaped foot with a spike beneath to prevent the mount from slipping. d. When the barrel reaches the horizontal position, and not before, the assistant gunner moves the thumb of each hand over the muzzle. This document (FT 81 B3, abridged) consists of two pages, each with a separate table. 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. The fuze wrench, M18, assembles the fuze to the cartridge, and the bladed tip on the end sets PD-type fuzes. 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. At the command, MARCH ORDER, the squad places the mortar, equipment, and ammunition in the squad vehicle and trailer. This is the inert PD fuze type "IR-81" used by the Italians for their 81mm mortar rounds during WWII. d. The gunner rough levels the cross-level bubble by making the bubble bounce from one side to the other. The M374A2 and M374A1 cartridges are fitted with the M90A1 propelling charge. a. Before-firing checks include the following: (1) Ammunition should be free of moisture, rust, and dirt. There must not be a visible gap between the fuze and cartridge body. a. b. e. The second ammunition bearer stands to the right rear of the mortar behind the ammunition bearer. They are assembled with either an M524-series, M526-series, or M567 fuze. 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. c. The first ammunition bearer checks the barrel and ensures that--. The components of the mortar consist of a cannon, mount, and baseplate. No tools are needed to set the fuze, and the setting can be changed several times without damaging the fuze. Short cartridges can be expected when firing below charge 4. The M252 medium mortar offers a compromise between the light and heavy mortars. DESCRIPTION. c. Crest Clearance. This ensures that the mortar does not fire should the round slip down the barrel during the subsequent drills. 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) . (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 contents of ammunition containers are shown by markings. If not, the cartridge is placed on its side, and the closing plug is removed using an M18 fuze wrench. The M375 cartridge uses the M90 propelling charge while the M375A2 and M375A1 cartridges use the M90A1 propelling charge. The gunner levels the elevation bubble by turning the elevation micrometer knob and reading the setting on the elevation scale and elevation micrometer--this setting is the minimum mask clearance. Before the mortar is mounted, the squad must perform premount checks. a. 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. That is generally how I use mortars. This may cause the firing pin to ignite the charges if the cartridge is dropped on the fin end (. An M18 fuze wrench is used to change settings. .50: BROWNING, M2 (HEAVY BARREL, TURRET TYPE) ON MOUNT, MACHINE GUN, TRAILER MTD: MULTIPLE CAL. 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 In addition to supervising the emplacement, laying, and firing of the mortar, he supervises all other squad activities. 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. 107 Army Pentagon
(3) The M256-series fuze has an SQ/IMP function only. The aluminum tail assembly has six integral fins equally spaced around the rear, which stabilize the round in flight. It can provide all-weather, ground-based, close supporting, accurate, immediately . The mortar should be within two turns of center of traverse when the task is compete. Figure 4-7. Theme by TechDoc. WP cartridges are stored with the fuze end up. The entire squad stays with the mortar. The term "indirect fire" means firing at an enemy without having a. The firing pin must be replaced and the bore swabbed. Section I. They function normally in light rain; however, heavy rain, sleet, or snow can cause an increase in the number of early bursts. a. Cartridges are shipped with a complete propelling charge, an ignition cartridge, and primer. A safety latch located at the side of the recess is used to secure the ball. The M29 would become the standard American mortar in the upcoming Vietnam War. The following safety checks must be enforced before firing the mortar. The cartridges are painted olive drab with yellow markings. *FREE* shipping on qualifying offers. b. 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). News. TM - Technical Manuals (Range 9) TM - Technical Manuals (Range 10) TM - Technical Manuals (Range 11-4) TM - Technical Manuals (Range 11-5) . If the round does not fire, the gunner tests the barrel for heat.
It is light enough to be portable when broken down into. Check the post SOP before applying the following procedure: (1) Select a place at least 100 meters from the mortar position, parked vehicles, and ammunition piles. Several types of HE ammunition are used in the 81-mm mortar, M252. The M252 81mm mortar is a smooth-bore, muzzle-loaded, high-angle-of-fire weapon. When a large number of cartridges are needed for a mission, they may be removed from the containers and prepared. The standard infantry support weapon is the M-252 81mm mortar, which lobs a 10 lb. However, at temperatures above 32 degrees Fahrenheit and at angles greater than 1068 mils, the flight time is sufficient to permit arming. It has two types: type 1 resembles the M734 fuze, and type 2 resembles the M935 fuze. Table 4-2. h. Where the ground is uneven and there is no level surface for the bipod, the gunner can adjust the plain leg. The squad leader stands behind the mortar where he can command and control his squad. 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 . 9301 Chapek Road., Bldg.1458
(6) The primer cartridge is checked for damage or dampness. With standard mortar, the maximum effective range is close to 4,000 metres; with a long-range system, this increases to nearly 4,500 metres. The first table is a chart that shows range and elevation for firing particular mortar shells. The propellant train (except the training cartridge) consists of an ignition cartridge and propellant charges. c. The assistant gunner lifts the bipod and stands it on its elevating leg so that the elevating handwheel is to the rear and the plain leg is to the front. Firing tables are used to determine the correct charge for firing. The sight is laid on 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. I say 120s are bad because they suffer from terrible dispersion even when not shooting at 6km. The assistant gunner places his right hand palm up (1 inch from the muzzle end) under the BAD and his left hand palm down (1 inch from the muzzle end) on top. If he is not within 20 mils, the gunner and assistant gunner must make another large shift before moving on. .50 MACHINE GUN, M55 AND MACHINE GUN, CAL. 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. high-explosive bomb at a range of about three miles. It uses the M772 mechanical time fuze and weighs about 10.6 pounds. The cartridge uses the M205 propelling charge and is assembled with the M567 or M524-series fuze. All mortar cartridges are painted to prevent rust and to identify their type. (3) Markings on rounds. The mortar is then re-laid on the aiming posts using the traversing crank. g. The barrel clamps can be moved along the barrel to counter large changes in elevation. SMALL DEFLECTION AND ELEVATION CHANGES. In any case, the gunner must ensure that the cartridge does not strike an obstacle. (2) The breech plug is screwed tightly to the barrel. The cartridge uses the M218 propelling charge, which consists of four horseshoe-shaped increments fitted around the tail. The fuze consists of a brass head, body assembly, and expelling charge. 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. d. Multioption. 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-fuzed short cartridges, which are duds, contain a complete explosive train and impact element. a. At this command, the squad proceeds as follows: a. The assistant gunner cleans the bore and swabs it dry. ), FIRING TABLES 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 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, HE, M483A1 (S&I BY PROP SEE DETAILS, FOOTNOTES), 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, M776 ON HOWITZER, MEDIUM, TOWED, 155MM, M777A1 FIRING PROJECTILE, HERA, M549 PROJECTILE, HERA, M549A1 (S&I BY PROP SEE DETAILS, FOOTNOTES), FIRING TABLES 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; 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, HERA, M549 AND PROJECTILE, HERA, M549A1 (S&I BY PROPONENT, SEE DEAILS, FOOTNOTES. [1] [2] Many countries use or used an 81 mm mortar in their armed forces. The M821A2/821A1/889A1 consists of the following major components: M935 Point Detonating Fuze or M734/734A1 Multi-Option Fuze. c. The assistant gunner disengages the barrel clamps and moves the bipod from the immediate area of the mortar position. It is fitted with a safety wire and pin that are removed immediately before firing. b. M64A1 Sightunit. Once set to act as an impact fuze, the mechanism cannot be reset for PROX. 4-12. f. Installation. The cartridge weighs about 9.12 pounds. c. The first ammunition bearer ensures that each cartridge is clean, the safety pin is present, and the ignition cartridge is in good condition. (5) With the exception of a few unused increments (within the same ammunition lot number) as replacements for defective increments, excess powder should be removed from the mortar position. To set for delay, the selector slot should be rotated clockwise until it is aligned with the "D" mark on the ogive. After the barrel cools, the gunner removes the sight and firing pin. On its right side, the clamp is recessed to receive the ball end of the locking rod. The cartridge can be fitted with the M524-series, M526-series, M567, or M532 fuzes. Complete cartridges are always handled with care. However, since explosives are affected by moisture and high temperature, they must be protected. d. Climatic Effects. The RSTA squadron only receives the 120mm mounted mortar, there is no augmentation dismounted maneuvers. It is painted white with black markings. Mount, M177, in folded position. The assistant gunner attempts to maintain the traversing mechanism on a horizontal plane. .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. In charge was the platoon commander - normally a lieutenant. He releases the securing strap, loosens the leg-locking handwheel, and lowers the plain leg until the locating catch engages in the recess. The 81mm mortar rounds use Red Phosphorus as the smoke generating agent. c. The gunner grasps both ends of the traverse screw assembly and supports the mortar during the subsequent drill. 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. Range Minimum to maximum 83 to 5,608 meters Rate of Fire . The mortar is within two turns of center of traverse. a. Point-Detonating. The gunner should expose 6 inches (150 millimeters) of elevation shaft and center the buffer carrier. 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. Propelling charges are covered or protected from dampness or heat. The M853 cartridge (M252 only) has a cylindrical body that contains an illuminating candle and parachute assembly. The ignition cartridge strikes the firing pin and detonates, which causes a flash that passes through the radial holes in the shaft.
(3) From this train, extend a starting train that will burn against the wind of single increments laid end to end. (3) The securing strap is correctly located, securing the barrel clamps and buffers to the plain leg. 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. Referring and realigning aiming posts ensure that all mortars are set on the same data. . Both the M90 and M90A1 propellants are in nine wax-tested, cotton cloth, bag increments assembled to the tail unit. The elevation change announced must be less than 90 mils and more than 35 mils. At the same time, the first ammunition bearer moves out on the double to realign the aiming posts. The M301A3 cartridge has a cylindrical body that contains an illuminating candle and parachute assembly. He exposes 4 inches (100 millimeters) of elevation shaft and folds the handle. Attached to the right of the screw is the traversing handwheel. It can be set from 3 to 55 seconds at half-second intervals. A .mil website belongs to an official government organization in the United States. Several types of RP/WP ammunition are described herein. 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 . The ammunition that can be fired by the 81-mm mortar, M252, is identified and described herein. End this starting train with not less than 1 meter of inert material (dry grass, leaves, or newspapers). It should be destroyed in accordance with standard procedures. . d. The gunner recovers the baseplate to the area designated by the squad leader.