81mm mortar range table

d. The ammunition is protected from mud, sand, dirt, and water. 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. 4-12. It is painted white with black markings. The components of the mortar consist of a canon, sight, mount, and baseplate. It uses the M205 propelling charge, consisting of four horseshoe-shaped increments fitted around the tail. b. It can provide all-weather, ground-based, close supporting, accurate, immediately This is the inert PD fuze type "IR-81" used by the Italians for their 81mm mortar rounds during WWII. At extreme temperatures (below -40 degrees Fahrenheit and above 125 degrees Fahrenheit), it is not unusual to experience an increase in malfunctions proportionate to the severity of conditions. The gunner stands to the left side of the mortar where he can manipulate the sight, elevating handwheel, and traversing handwheel. Then he relocks the barrel clamp. 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. (3) From this train, extend a starting train that will burn against the wind of single increments laid end to end. Dropping may cause the propellant charges to ignite, causing bodily injuries. 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 . The gunner is given a deflection change in a fire command between 20 and 60 mils inclusive. Table 4-3. Red phosphorus/white phosphorus--M819 and M375-series. The gunner removes the sight and places it in the case with 3200 deflection and 0800 elevation indexed. The M252 medium mortar offers a compromise between the light and heavy mortars. The tabulated data of the 81-mm mortar, M252, are shown in Table 4-1. To set for delay, the selector slot should be rotated clockwise until it is aligned with the "D" mark on the ogive. The vertical cross line of the sight is on the left edge of the aiming point. If the fuze does not function as set, it automatically functions at the next lower setting. 60mm, 81mm, and 120mmMortar Increments. 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 leg-locking handwheel must then be tightened by hand, ensuring the teeth on either side are correctly meshed. End this starting train with not less than 1 meter of inert material (dry grass, leaves, or newspapers). 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 60mm mortar section is located in the weapons platoon of the rifle company, is armed with three 60mm mortars, and is High explosive is used for both fragmentation and blast effect against personnel and light-skinned vehicles. How the RCGM works: Target coordinates are programed into the RCGM using a portable GPS setter. LHMBC. 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. .50: BROWNING, M2 (HEAVY BARREL, FLEXIBLE) ON MOUNT, MACHINE GUN, TRIPOD MTD, CAL. a. He must ensure that the ball-shaped end of the locking rod is secured in its recess by the locking latch. As soon as the sight data are announced, the gunner places it on the sight. Mount MC Medical Guide; Client-side mods; TFAR 1.x for players; 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. When targets are beyond such irregularities, a clearance of at least 30 meters should be allowed to ensure maximum effect over the target area. One-quarter turn on the adjusting nut equals one turn of the traversing handwheel. 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. (3) The securing strap is correctly located, securing the barrel clamps and buffers to the plain leg. The fuze setter, M25, sets M84-series time fuzes. The squad leader points to the exact spot where the mortar is to be mounted. Attached to the right of the screw is the traversing handwheel. See Chapter 3, paragraph 3-14 for a detailed discussion of malfunctions. (3) Markings on rounds. When the approximate alignment is completed, the gunner signals the assistant gunner to lower the bipod by pushing down on the mortar. 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 . (2) Color code. The gunner should expose 6 inches (150 millimeters) of elevation shaft and center the buffer carrier. The body is made of aluminum and brass. The components of the mortar consist of a cannon, mount, and baseplate. The standard infantry support weapon is the M-252 81mm mortar, which lobs a 10 lb. M120/M121 120 mm Mortar. It weighs about 9.05 pounds. 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. Training practice--M879, M880, M68, and sabot. When fired, the cartridge carries the ignition cartridge with it, leaving the mortar ready for the next cartridge. The muzzle end has a short tapered lead-in which acts as a . b. (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. 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. Short cartridges can be expected when firing below charge 4. Several types of RP/WP ammunition are described herein. Training practice is used only for training. Safety before firing is provided by a safety wire, which must be removed just before firing. He then checks the sight picture to ensure he is within 20 mils of a proper sight picture. The cartridge weighs about 9.4 pounds. Propelling charges are covered or protected from dampness or heat. The fuze is set manually to proximity, point detonate, or delay modes. 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. Their firing positions and principal duties are as follows: a. They function normally in light rain; however, heavy rain, sleet, or snow can cause an increase in the number of early bursts. 1:4 For the 81MM Mortar System: X NSN (LIN): 1015-01-441-3113 : STAFF SECTION, CLEANING, ARTILLERY 1:4: If the barrel is cool enough to handle, the crew removes the round as described below. (2) The fin and fuze assembly must be checked for tightness and damage. All elements given in the fire command are repeated by the squad. Weights (pounds) System (including basic issue items) Barrel (with blast attenuator device) Mount M3A1 Baseplate 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. 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. The cartridge must not be fired below charge 3. c. Crest Clearance. That is generally how I use mortars. If he is not within 20 mils, the gunner and assistant gunner must make another large shift before moving on. Both the M90 and M90A1 propellants are in nine wax-tested, cotton cloth, bag increments assembled to the tail unit. The gunner can depress the barrel, if necessary, to provide easier access to the firing pin. Types of rounds, classification, and characteristics for the 81-mm mortar, M252. The fuze has a safety wire that must be removed before firing. Secure .mil websites use HTTPS 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 fuze body is graduated from 0 to 25 seconds in 1-second intervals; 5-second intervals are indicated by bosses. This document (FT 81 B3, abridged) consists of two pages, each with a separate table. The gunner moves the mortar as the assistant gunner steadies it. It is set using the bladed end of the M18 fuze wrench. The gunner is given an administrative command to lay the mortar on a deflection of 2860 or 2740 mils. The M853 cartridge (M252 only) has a cylindrical body that contains an illuminating candle and parachute assembly. 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. It arms within a maximum of 2.50 seconds. The cartridge is painted light green and has red markings and one narrow yellow band. 60MM M224A1. Baseplate placed against baseplate stake. b. It is designed to be fired in the indirect fire mode, cannot be fired handheld, and normally utilizes a FDC. He maintains the ammunition for firing and provides local security for the mortar position. During training, the gunner may use the driving stake from the aiming post case. Examples are: DESCRIPTION. The section leader, acting as FDC, has one deflection instead of two or more. (2) The barrel is locked to the baseplate, and the open end of the socket points in the direction of fire. The propellant train (except the training cartridge) consists of an ignition cartridge and propellant charges. The fuze wrench, M18, assembles the fuze to the cartridge, and the bladed tip on the end sets PD-type fuzes. This ensures a maximum traversing and elevating capability after making the movement. Standard A ammunition for the M29A1 mortar is Standard B for the M252 mortar (, Light green Yellow band with red markings. The squad leader notifies the FDC of the minimum mask clearance elevation. The cartridges are returned to their original containers. The M821A2/821A1/889A1 consists of the following major components: M935 Point Detonating Fuze or M734/734A1 Multi-Option Fuze. The M853 and M301A3 illuminating ammunition are described herein. Types of rounds, classification, and characteristics for the 81-mm mortar, M29A1 (Standard B for the 81-mm mortar, M252). It has two types: type 1 resembles the M734 fuze, and type 2 resembles the M935 fuze. The firing pin must be replaced and the bore swabbed. Burst Height. c. The moisture-resistant seal of the container is broken when the ammunition is to be used. If not, the cartridge is placed on its side, and the closing plug is removed using an M18 fuze wrench. (1) Mask clearance and overhead clearance are sufficient. However, since explosives are affected by moisture and high temperature, they must be protected. The removable increments are fitted onto or around the shaft, depending on their type. c. The assistant gunner stands to the right of the mortar, facing the barrel and ready to load. He rotates the socket so that the open end is pointing in the direction of fire. This section contains information on how to prepare the 81-mm mortar, M252, for firing, how to conduct safety checks, and, if a misfire should occur during firing, what actions the crew applies to remove the cartridge from the barrel. The assistant gunner cleans the bore and swabs it dry. a. Point-Detonating. A locked padlock c. The elevating shaft is contained in the elevating leg; to the left of the elevating leg is the elevating handwheel. 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. (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 platoon leader commands the platoon and supervises the training of the elements. The mortar is mounted and the sight is installed. e. The gunner centers the elevation bubble. 4-4. c. The assistant gunner disengages the barrel clamps and moves the bipod from the immediate area of the mortar position. The fuze body is graduated from 0 to 50 seconds in 2-second intervals; 10-second intervals are indicated by bosses. An official website of the United States government. For those of you in the market for a Dummy/Display 81mm mortar, I hope this article can answer a few of your questions before you order. *FREE* shipping on qualifying offers. The bipod provides front support for the barrel and carries the gears necessary to lay the mortar. I have included my order history, detailed photos, as well as my personal opinion on International Military Antiques, IMA -USA www.ima-usa.com 81mm Display Mortar that they have for sale. He places his thumbs alongside the forefingers, being careful to keep both hands away from the muzzle. Close approach to crests, trees, towers, large buildings, parked aircraft, mechanized equipment, and similar irregularities causes functioning at heights greater than average level. The ignition cartridge strikes the firing pin and detonates, which causes a flash that passes through the radial holes in the shaft. The enemy will use them. News. 0.50, M8 (REPRINTED W/BASIC INCL C1-2) (S&I BY PROP SEE DETAILS, FOOTNOTES), FIRING TABLES FOR MACHINE GUN, CALIBER .50: BROWNING, M2 (HEAVY BARREL, TURRET TYPE) ON MOUNT, MACHINE GUN, TRAILER MOUNTED: MULTIPLE CALIBER .50 MACHINE GUN, M55 FIRING CARTRIDGE, CALIBER .50: API, M8 (S&I BY PROP SEE DETAILS, FOOTNOTES), FIRING TABLES FOR MACHINE GUN, CALIBER .50: FICED, M85 TANK, COMBAT, FULL TRACKED: 105MM GUN, M60 SERIES FIRING CARTRIDGE, CALIBER .50: API, M8 CARTRIDGE, CALIBER .50: API-T M20 CARTRIDGE, CALIBER .50: BALL, M33 CARTRIDGE, CALIBER .50: TRACER, M17 (S&I BY PROP SEE DETAILS, FOOTNOTES), MACHINE GUN, CAL. It should be destroyed in accordance with standard procedures. (1) The rotating socket is free to move in a complete circle. FT 81-AI-3 Firing Tables Mortar, 81mm: M28A1 and M29 Mortar 81mm Self propelled M125A1 and M125 Carrier, 81mm Mortar Tracked XM755 (c) The gunner determines mask and overhead clearance by sighting along the barrel with his eye near the breech plug. The cartridge is painted olive drab with yellow markings. It uses the M219 propelling charge and weighs about 9.1 pounds. a. Additional information is included on an ammunition data card inside each container. .30, BROWNING, M1919A4 AND M2 (HEAVY BARREL), .30, M2 (REPRINTED W/BASIC INCL C1) (S&I BY PROP SEE DETAILS, FOOTNOTES), GUN, MACHINE: CAL. a. The gunner checks the baseplate and ensures that--. (8) To help minimize the occurrence of short rounds and or duds, unpackaged ammunition that has been dropped should not be fired. Correct way to open an ammunition box. VERY NICE condition! (4) The blast attentuator device is secured correctly. Before the mortar is mounted, the squad must perform premount checks. (4) The M567 fuze is an impact fuze that has a SQ/IMP or D function. Washington DC 20310-0107, ADRP - Army Doctrine References Publications, ATTP - Army Tactics, Techniques, and Procedures, FY Publication Status Report (CAC required for access), Publishing Resources (CAC required for access), PC/PCO/FMO/EPCO Directory (CAC required for access), usarmy.pentagon.hqda-apd.mbx.customer-service@army.mil, GUN, MACHINE, CAL. b. 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. The wrench (P/N 9349539) sets M772 MT and M768 time fuzes. The round has a burst height of 600 meters and provides illumination for about 60 seconds for an area of about 1,200 meters. If it gets wet or dirty, it must be wiped off at once. A spring-loaded locating catch is behind the elevating gear housing, which locates the plain leg in its supporting position for level ground. (1) The barrel is clean and free from grease and oil both inside and out. The company level vehicles also carry a vehicle-mounted 120mm mortar, which is augmented by the 60mm M224 mortar for dismounted use. The gunner places the announced deflection on the sight (without disturbing the lay of the weapon) and looks through the sightunit. WP cartridges are stored with the fuze end up. XM1210. Upon completion of any bipod movement on the barrel, the gunner ensures that the firing pin recess is facing upward. An M18 fuze wrench is used to change settings. Placing the mortar in position at night does not relieve the gunner of the responsibility of checking for mask clearance and overhead interference. ), 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. 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. Army Publishing Directorate e. The assistant gunner passes the round to the first ammunition bearer who inspects it for the cause of the misfire. The cartridge uses the M218 propelling charge, which consists of four horseshoe-shaped increments fitted around the tail. The leg-locking handwheel must then be tightened, ensuring the teeth are correctly meshed. MFCS Mounted. 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 first ammunition bearer puts both hands on the cooling fins under the barrel and slowly lifts the barrel until it is horizontal. The barrel clamp, which consists of an upper and lower clamp, is situated at the top. c. Mechanical Time. 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 cartridge weighs about 9.12 pounds. Each squad member should be able to perform all the following premount checks: a. In any case, the gunner must ensure that the cartridge does not strike an obstacle.

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