81mm mortar range table

The equipment is placed out the same as for the gunner's examination (Chapter 9). The propellant train (except the training cartridge) consists of an ignition cartridge and propellant charges. 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. Propelling charges are covered or protected from dampness or heat. He positions the lower barrel clamp against the lower stop band on the barrel and secures the upper barrel clamp. He opens the cross-level handwheel, traversing handwheel, and barrel clamp. In charge was the platoon commander - normally a lieutenant. These cartridges are used first in subsequent firing so that once-opened stocks can be kept to a minimum. The striker has been modified to be able to use German and Italian patterns of 81mm mortar . d. The gunner rough levels the cross-level bubble by making the bubble bounce from one side to the other. The table on the right describes the three most common setups. .50: BROWNING, M2 (HEAVY BARREL, TURRET TYPE) ON MOUNT, MACHINE GUN, TRAILER MTD: MULTIPLE CAL. They function normally in light rain; however, heavy rain, sleet, or snow can cause an increase in the number of early bursts. The M821/M889 are 81mm HE Mortar Cartridges. Training practice--M879, M880, M68, and sabot. A securing strap is attached to the plain leg for securing the bipod in the folded position. Fort Belvoir, VA 22060 (1) The rotating socket is free to move in a complete circle. 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. Cartridges assembled with the M532 fuze must be fired above charge 0. 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. a. Cartridges are shipped with a complete propelling charge, an ignition cartridge, and primer. 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. Powered by Hugo. Ammunition is typed according to use (Table 4-2). Barrel (with blast attenuator device) The gunner can depress the barrel, if necessary, to provide easier access to the firing pin. He levels all bubbles. The M252 system . (3) The circlip is correctly located, securing the rotating socket to the baseplate. b. Referring and realigning aiming posts ensure that all mortars are set on the same data. [1] [2] Many countries use or used an 81 mm mortar in their armed forces. It is fitted with a safety wire and pin that are removed immediately before firing. b. The cannon assembly consists of the barrel that is sealed at the lower end with a removable breech plug, which houses a removable firing pin (Figure 4-3). Agreed that mortars should generally be used close to the frontline. (d) Firing is slowed if mask clearance must be checked before each firing but this can be eliminated if minimum mask clearance is determined. This may cause the firing pin to ignite the charges if the cartridge is dropped on the fin end (. 4-12. If not, the cartridge is placed on its side, and the closing plug is removed using an M18 fuze wrench. The vertical cross line of the sight is on the left edge of the aiming point. It can be fitted with either the M567, M524, or M532-series fuzes. If, upon removal of the safety wire, a buzzing sound in the fuze is heard, the round should not be used. M120/M121 120 mm Mortar. d. The gunner recovers the baseplate to the area designated by the squad leader. d. The first ammunition bearer stands to the right rear of the mortar. 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. Types of rounds, classification, and characteristics for the 81-mm mortar, M29A1 (Standard B for the 81-mm mortar, M252). The fuze arms and functions normally when fired at any angle of elevation between 0800 and 1406 mils at charges 1 through 9. It weighs about 9.05 pounds. The fuzes may be used for day or night operations. The bipod provides front support for the barrel and carries the gears necessary to lay the mortar. Baseplate placed against baseplate stake. (2) The barrel is locked to the baseplate, and the open end of the socket points in the direction of fire. MFCS Dismounted. Illuminating is used for battlefield illumination and signaling. The fuze is screwed into the cartridge body, and it is seated and secured using an M18 wrench. The muzzle end has a short tapered lead-in which acts as a . b. Each cartridge weighs about 10 pounds and is provided with the M223 propelling charge, consisting of four horseshoe-shaped increments fitted around the tail. e. The gunner centers the elevation bubble. 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. He rotates the socket so that the open end is pointing in the direction of fire. It provides illumination for about 60 seconds with 600,000 candlepower illumination. LARGE DEFLECTION AND ELEVATION CHANGES. At the command, MARCH ORDER, the squad places the mortar, equipment, and ammunition in the squad vehicle and trailer. The M252 medium mortar offers a compromise between the light and heavy mortars. .50 MACHINE GUN, M55 AND MACHINE GUN, CAL. The fuze threads and fuze well threads are inspected for damage. When cartridges have been prepared for firing, but are not used, all powder increments and safety wires are replaced. This is the inert PD fuze type "IR-81" used by the Italians for their 81mm mortar rounds during WWII. It has no safety pins or wires to reduce preparation time. It is light enough to be portable when broken down into. The platoon leader commands the platoon and supervises the training of the elements. It is designed to be fired in the indirect fire mode, cannot be fired handheld, and normally utilizes a FDC. If the barrel is hot, the gunner may then apply water to the outside of the barrel until it is cool. The enemy will use them. 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 contains a delayed arming feature that ensures the fuze remains unarmed and detonator safe for a minimum of 1.25 seconds of flight. (2) Color code. If the mortar section is to operate quickly and effectively in accomplishing its mission, mortar squad members must be proficient in individually assigned duties. 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 . Excess increments should not accumulate near the mortar positions but are removed to a designated place of burning and destroyed. Red phosphorus rounds can be fired from the M29/M29A1 at a reduced charge (maximum charge = charge 2). (3) The securing strap is correctly located, securing the barrel clamps and buffers to the plain leg. c. Authorized Cartridges. To make the shift, the gunner places the fingers of his right hand in the muzzle and his left hand on the left leg. Weights (pounds) System (including basic issue items) Barrel (with blast attenuator device) Mount M3A1 Baseplate The M1 was a derivative of the French mle 27/31 system (itself an improved form of the Stokes Trench Mortar of World War 1 fame) and slightly altered to suit American needs. The M853 and M301A3 illuminating ammunition are described herein. 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. This action breaks an internal sheet pin and internal wire, thereby disabling the proximity function. Their firing positions and principal duties are as follows: a. REFER DEFLECTION TWO EIGHT SEVEN FIVE (2875), REALIGN AIMING POSTS. It has two types: type 1 resembles the M734 fuze, and type 2 resembles the M935 fuze. The term "indirect fire" means firing at an enemy without having a. Its range and explosive power is greater than the M224, yet it is still light enough to be man . b. He must not stand directly behind the mortar. 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. A lock ( The BAD is removed only by qualified maintenance personnel. The M375A3 cartridge is ballistically similar to the M374A3 (HE) cartridge. The assistant gunner cleans the bore and swabs it dry. 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.] On its right side, the clamp is recessed to receive the ball end of the locking rod. The fuze setter, M25, sets M84-series time fuzes. f. Ammunition should be stored under cover. The 81-mm mortar, M252, is a smooth-bore, muzzle-loaded, high-angle-of-fire weapon. A spring-loaded locating catch is behind the elevating gear housing, which locates the plain leg in its supporting position for level ground. The lower clamp is shaped and bored on each side to house the buffer cylinders. 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. He may assist the gunner in shifting the mortar when the gunner is making large deflection changes. 4-11. He knocks down the near aiming post and proceeds to the far aiming post. b. The 81mm mortar rounds use Red Phosphorus as the smoke generating agent. During training, the gunner may use the driving stake from the aiming post case. Several types of RP/WP ammunition are described herein. 9301 Chapek Road., Bldg.1458 There must not be a visible gap between the fuze and cartridge body. Close approach to crests, trees, towers, large buildings, parked aircraft, mechanized equipment, and similar irregularities causes functioning at heights greater than average level. Features: 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 previous 81mm mortar. The floating firing pin located within the primer has approximately 1/16 of an inch to move around. The fuze is nicely marked and is dated 1940. Maximum Range (meters): 7,240 (with standard fuze) . To prepare for firing, the slot is aligned in the striker with SQ or delay using the M18 fuze wrench. The body is made of aluminum and brass. g. The barrel clamps can be moved along the barrel to counter large changes in elevation. If the situation allows for a longer waiting period, the dud can be considered safe for handling after 40 hours. Short cartridges can be expected when firing below charge 4. The gunner removes the sight and places it in the case with 3200 deflection and 0800 elevation indexed. The gunner stands to the left side of the mortar where he can manipulate the sight, elevating handwheel, and traversing handwheel. The gunner should expose 6 inches (150 millimeters) of elevation shaft and center the buffer carrier. b. He tightens the leg-locking handwheel (ensuring the teeth are correctly meshed) and fastens the securing strap over the arm and around the buffers. Figure 4-8. f. The open end of the socket must continue to point in the direction of fire. Burst Height. Army Publishing Directorate The fuze body is graduated from 0 to 25 seconds in 1-second intervals; 5-second intervals are indicated by bosses. The squad leader stands behind the mortar where he can command and control his squad. 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. This ensures a maximum traversing and elevating capability after making the movement. When firing under the control of an FDC, he reports to the FDC that mask clearance cannot be obtained at a certain elevation. News. If the round does not fire, the gunner tests the barrel for heat. The M252 81mm mortar is a smooth-bore, muzzle-loaded, high-angle-of-fire weapon. He moves the mortar until the vertical line of the sight is aligned approximately on the aiming post. The M734 multioption fuze is the only one used with the 81-mm mortar. No tools are needed to set the fuze, and the setting can be changed several times without damaging the fuze. 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. Several types of HE ammunition are used in the 81-mm mortar, M252. An M18 fuze wrench is used to change settings. (3) Markings on rounds. .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. c. Upon receiving the command REFER, REALIGN AIMING POST, two actions take place at the same time in the mortar squad. The same procedure for aligning the far aiming post is used to align the near aiming post. It comes preset to function on SQ/IMP, and the selector slot should align with the SQ mark on the ogive. The ammunition that can be fired by the 81-mm mortar, M252, is identified and described herein. The fuze wrench, M18, assembles the fuze to the cartridge, and the bladed tip on the end sets PD-type fuzes. Those cartridges assembled with the M524 (A1, A2, A3, or A4) fuze are for use by the US Marine Corps and US Navy only. (1) The M935 fuze has two function settings: impact and delay. These are NDI items . They should not be approached for 5 minutes or disturbed for at least 30 minutes after firing. 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 M64A1 Sightunit. Attached to the arm is the cross-leveling mechanism, which is attached to the clamp assembly at its upper end. The cartridge is dropped down the barrel, fin-end first. An ammunition lot number is assigned to each ammunition lot, which is marked on each cartridge and packing container. 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 ensures that each cartridge is clean, the safety pin is present, and the ignition cartridge is in good condition. b. He places firing data on the sight and lays the mortar for deflection and elevation. General Dynamics Ordnance and Tactical Systems' 81mm Roll Controlled Guided Mortar (RCGM) provides an affordable, flexible solution to meet that need. The M821A2/821A1/889A1 consists of the following major components: M935 Point Detonating Fuze or M734/734A1 Multi-Option Fuze. The assistant gunner exposes 8 inches (200 millimeters) of elevation shaft, leaving the elevation handwheel unfolded. The cartridge must not be fired below charge 3. Safety before firing is provided by a safety wire, which must be removed just before firing. It is fitted with a standard pull wire and safety pin that are removed immediately before firing. a. 81mm 120mm 60mm . It was even a tool used by airborne units, and was dropped in parachute bundles during Operations Neptune, Market Garden, and Varsity. The aluminum tail assembly has six integral fins equally spaced around the rear, which stabilize the round in flight. ), 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 propelling charge is contained in four horseshoe-shaped, felt-fiber containers or nine wax-tested, cotton cloth, bag increments. This round may be stored in a horizontal position. 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. Types of rounds, classification, and characteristics for the 81-mm mortar, M252. The 81mm weapons platoon consisted of the headquarters platoon and four mortar squads. e. Care, Handling, and Preservation. 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. Tabulated data. It arms within a maximum of 2.50 seconds. In addition to supervising the emplacement, laying, and firing of the mortar, he supervises all other squad activities. He ensures that the firing pin recess is facing upwards. When a misfire occurs, any member of the squad immediately announces, "Misfire." With the clamps facing away from him, the assistant gunner traverses the buffer carrier to the traversing handwheel and folds the handle. The assistant gunner attempts to maintain the traversing mechanism on a horizontal plane. a. (7) When opening an ammunition box, the ammunition bearer ensures the box is horizontal to the ground, not nose- or fin-end up. c. Crest Clearance. The cartridge is painted light green and has red markings and one narrow yellow band. The 81-mm mortar, M252, is a smooth-bore, muzzle-loaded, high-angle-of-fire weapon. Both the M90 and M90A1 propellants are in nine wax-tested, cotton cloth, bag increments assembled to the tail unit. The first ammunition bearer shakes the barrel to dislodge any remnants from the last round fired, and he lowers the barrel into the rotating socket of the baseplate. It is painted white with black markings. Figure 4-4. . This section implements STANAG 2321 and QSTAG 900 (Edition 1). He maintains the ammunition for firing and provides local security for the mortar position. The gunner moves the mortar as the assistant gunner steadies it. SMALL DEFLECTION AND ELEVATION CHANGES. The M252 is highly accurate up to ranges of 4500m to 5700m depending on the 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. 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. ), 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 components of the mortar consist of a cannon, mount, and baseplate. b. The air burst over average types of soil ranges from 1 to 6 meters, depending on the angle of approach. 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. 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. Red phosphorus/white phosphorus is used for screening, producing casualties, creating incendiary effects, and signaling. When set at delay, the fuze train causes a 0.05-second delay before functioning. The assistant gunner checks the bipod and ensures that--. Both the 60mm and 120mm mortar rounds use White Phosphorus. Correctly applying and performing these duties enables the mortar section to perform as an effective fighting team. Each squad member should be able to perform all the following premount checks: a. 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 pile is covered with a double thickness of tarpaulin. 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 . (1) Marking on container. d. When the barrel reaches the horizontal position, and not before, the assistant gunner moves the thumb of each hand over the muzzle. b. The cartridge weighs about 9.4 pounds.

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