He levels all bubbles. 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 . 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). The 81-mm mortar, M252, is a smooth-bore, muzzle-loaded, high-angle-of-fire weapon. 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. (4) The leg-locking handwheel is hand tight. The first ammunition bearer puts both hands on the cooling fins under the barrel and slowly lifts the barrel until it is horizontal. It is assembled with the M772A1 MTSQ. 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. He exposes 1 inch (25 millimeters) of cross-level shaft and folds the handle. The mortar also offered the promised increase in range as well, allowing fire teams to engage the enemy at distance. If the barrel is cool enough to handle, the crew removes the round as described below. [Firing and Deflection Conversion Tables] - The Portal to Texas History b. Close approach to crests, trees, towers, large buildings, parked aircraft, mechanized equipment, and similar irregularities causes functioning at heights greater than average level. He places the sight case and aiming posts to the left front of the mortar position. Additionally, they carry the 81mm M252 mortar that can only be used in a dismounted capacity. An ammunition lot number is assigned to each ammunition lot, which is marked on each cartridge and packing container. The bipod provides front support for the barrel and carries the gears necessary to lay the mortar. Official websites use .mil 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. He exposes 4 inches (100 millimeters) of elevation shaft and folds the handle. Several types of HE ammunition are used in the 81-mm mortar, M252. (8) To help minimize the occurrence of short rounds and or duds, unpackaged ammunition that has been dropped should not be fired. High explosive--M821, M889, M374-series, and M362. Baseplate placed against baseplate stake. SQUAD AND SECTION ORGANIZATION AND DUTIES, Each member of the infantry mortar squad has principle duties and responsibilities. Types of rounds, classification, and characteristics for the 81-mm mortar, M252. b. The removable increments are fitted onto or around the shaft, depending on their type. System (including basic issue items) e. The pull wire and safety wire are removed from the fuze just before firing. Home; Swifty. 0.50, BROWNING, M2; FIRING CARTRIDGE, ARMOR-PIERCING-INCENDIARY, CAL. (1) The barrel is clean and free from grease and oil both inside and out. 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. Training practice--M879, M880, M68, and sabot. a. Before-firing checks include the following: (1) Ammunition should be free of moisture, rust, and dirt. Figure 4-4. Powered by Hugo. If the primer is not dented, the round may be used again. If not, he may still fire at the desired range by selecting a charge zone having a higher elevation. At the muzzle end is a cone-shaped blast attenuator device (BAD) that is fitted to reduce noise. Indirect Fire 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. He positions the lower barrel clamp against the lower stop band on the barrel and secures the upper barrel clamp. The aluminum tail assembly has six integral fins equally spaced around the rear, which stabilize the round in flight. The M252 81mm medium extended range mortar (see diagram below) is a crew-served, smooth bore, muzzle loaded, high angle of fire weapon system. Training practice is used only for training. (4) The blast attentuator device is secured correctly. Proximity-fuzed short cartridges, which are duds, contain a complete explosive train and impact element. Other armies count on 81mm mortar families. 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. The M252 81mm mortar is a smooth-bore, muzzle-loaded, high-angle-of-fire weapon. This ensures that the mortar does not fire should the round slip down the barrel during the subsequent drills. All PD fuzes are superquick--detonate on impact. The propelling charges are assembled around the fin assembly shaft. MFCS Dismounted. 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 elevation change announced must be less than 90 mils and more than 35 mils. M252 81mm Medium Extended Range Mortar - Specifications (The handle of the wrench is turned counterclockwise.) If water is not available, the gunner must stand clear of the mortar until the barrel is cool. M821/M889 81mm HE Mortar Cartridges - GlobalSecurity.org M29, 81mm Mortar - Military Factory If the barrel is hot, the gunner may then apply water to the outside of the barrel until it is cool. 4-11. The fuze should already be fitted to the cartridge. If the line of sight clears the mask, it is safe to fire. A .mil website belongs to an official government organization in the United States. To prepare for firing, the slot is aligned in the striker with SQ or delay using the M18 fuze wrench. The barrel clamps are then closed. 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. 1:4 For the 81MM Mortar System: X NSN (LIN): 1015-01-441-3113 : STAFF SECTION, CLEANING, ARTILLERY 1:4: The cartridge is painted olive drab with yellow markings and weighs about 9.05 pounds. When the approximate alignment is completed, the gunner signals the assistant gunner to lower the bipod by pushing down on the mortar. This action breaks an internal sheet pin and internal wire, thereby disabling the proximity function. He lays for deflection, taking the proper sight picture. The fuze is screwed into the cartridge body, and it is seated and secured using an M18 wrench. These are NDI items . 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. The gunner then kicks the barrel several times with his heel in an attempt to dislodge the round. Types of rounds, classification, and characteristics for the 81-mm mortar, M29A1 (Standard B for the 81-mm mortar, M252). The M375 cartridge uses the M90 propelling charge while the M375A2 and M375A1 cartridges use the M90A1 propelling charge. a. 81-mm MORTAR, M252 The 81-mm mortar, M252, delivers timely, accurate fires to meet the . REFERRING OF THE SIGHT AND REALIGNMENT OF AIMING POSTS USING M64 SIGHT. (2) Color code. 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. .50: AP, M2 AND CARTRIDGE, CAL. The fuze wrench, M18, assembles the fuze to the cartridge, and the bladed tip on the end sets PD-type fuzes. 0.30, BROWNING, M1917A1; GUN, MACHINE: CAL. Any target that requires that elevation, or a lower one, cannot be engaged from that position. High explosive is used for both fragmentation and blast effect against personnel and light-skinned vehicles. 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. Attached to the arm is the cross-leveling mechanism, which is attached to the clamp assembly at its upper end. It contains white phosphorus that produces white smoke on contact with air. 4-4. The muzzle end has a short tapered lead-in which acts as a . He tightens the leg-locking handwheel (ensuring the teeth are correctly meshed) and fastens the securing strap over the arm and around the buffers. The fuzes may be used for day or night operations. PDF 81-mm MORTAR, M252 - GlobalSecurity.org It is used for records such as reports on condition, malfunctions, and accidents. The term "indirect fire" means firing at an enemy without having a. c. The first ammunition bearer checks the barrel and ensures that--. The mortar squad consists of five men (Figure 4-1). d. The first ammunition bearer stands to the right rear of the mortar. 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 . It uses the M185 propelling charge that consists of eight increments fitted into the spaces between the fins and held by a propellant holder. The M252 system . Its range and explosive power is greater than the M224, yet it is still light enough to be man . If he is not within 20 mils, the gunner and assistant gunner must make another large shift before moving on. The components of the mortar consist of a cannon, mount, and baseplate. SMALL DEFLECTION AND ELEVATION CHANGES. The M252 is highly accurate up to ranges of 4500m to 5700m depending on the After the rounds have been removed, they should always be handled with two hands to prevent accidental dropping. 81mm ML 3-inch | Weaponsystems.net Figure 4-7. M252 81mm Medium Extended Range Mortar - Federation of American Scientists Then he relocks the barrel clamp. Fired . They are painted light green with red markings and one narrow yellow band. The contents of ammunition containers are shown by markings. It provides illumination for about 60 seconds with 600,000 candlepower illumination. It was even a tool used by airborne units, and was dropped in parachute bundles during Operations Neptune, Market Garden, and Varsity. VERY NICE condition! Upon completion of any bipod movement on the barrel, the gunner ensures that the firing pin recess is facing upward. b. News. This may preclude moving the bipod. Lock HE Guided Mortar is in development. (4) Extra increments are removed if the cartridge is to be fired with less than full charge. The body is made of aluminum and brass. It engages the 1 3/4-inch flats on the setting ring or the fuze head. The striker has been modified to be able to use German and Italian patterns of 81mm mortar . The following safety checks must be enforced before firing the mortar. d. The gunner removes the sight from its case, mounts it on the mortar, and sets a deflection of 3200 mils and an elevation of 1100 mils. The fuze body is graduated from 0 to 50 seconds in 2-second intervals; 10-second intervals are indicated by bosses. Mortar Weapon Systems - USAASC LHMBC. This ensures a maximum traversing and elevating capability after making the movement. c. Crest Clearance. The tabulated data of the 81-mm mortar, M252, are shown in Table 4-1. a. After the mortar is mounted, the gunner makes a thorough check. The fuze consists of a brass head, body assembly, and expelling charge. e. The gunner centers the elevation bubble. If, upon removal of the safety wire, a buzzing sound in the fuze is heard, the round should not be used. a. c. The assistant gunner disengages the barrel clamps and moves the bipod from the immediate area of the mortar position. The 60mm mortar section is located in the weapons platoon of the rifle company, is armed with three 60mm mortars, and is c. The first ammunition bearer ensures that each cartridge is clean, the safety pin is present, and the ignition cartridge is in good condition. He makes large deflection shifts by shifting the bipod assembly and keeps the bubbles level during firing. If the situation allows for a longer waiting period, the dud can be considered safe for handling after 40 hours. e. The assistant gunner passes the round to the first ammunition bearer who inspects it for the cause of the misfire. M64A1 Sightunit. That is generally how I use mortars. .50: BROWNING, M2 (HEAVY BARREL, FLEXIBLE) ON MOUNT, MACHINE GUN, TRIPOD MTD, CAL. ) or https:// means youve safely connected to the .gov website. It is fitted with a safety wire and pin that are removed immediately before firing. The M1 became the standard American . Ammunition is typed according to use (Table 4-2). PDF Tabular Firing Tables - United States Army The second ammunition bearer retrieves the aiming posts. The fuze threads and fuze well threads are inspected for damage. An internal clock mechanism provides nine seconds of safe air travel (610 to 2,340 meters along trajectory for charge 0 through 9, respectively). c. Mechanical Time. If the round does not fire, the gunner tests the barrel for heat. M120/M121 120 mm Mortar. He uses the chain of command to assist him in effecting his command and supervising duties. These fuzes use a clockwork mechanism to delay functioning for a specific time. A lock ( This may cause the firing pin to ignite the charges if the cartridge is dropped on the fin end (. 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. It weighs about 9.05 pounds. The explosive elements in primers and fuzes are sensitive to shock and high temperature. a. News. .50: BROWNING, M2 (HEAVY BARREL, TURRET TYPE) ON MOUNT, MACHINE GUN, TRAILER MTD: MULTIPLE CAL. The 0-second boss is wider and differs in shape from the other body bosses; the safe setting position is indicated by the letter "S" on the fuze body. The tabulated data of the 81-mm mortar, M252, are shown in Table 4-1. Red phosphorus/white phosphorus is used for screening, producing casualties, creating incendiary effects, and signaling. He is also the squad driver. Both legs are fitted with a disk-shaped foot with a spike beneath to prevent the mount from slipping. Both the 60mm and 120mm mortar rounds use White Phosphorus. When set at delay, the fuze train causes a 0.05-second delay before functioning. He moves the mortar until the vertical line of the sight is aligned approximately on the aiming post. 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. The gunner unlocks the barrel clamp and rotates the barrel, unlocking the breech plug from the rotating socket of the baseplate. MFCS Mounted. The components of the mortar consist of a canon, sight, mount, and baseplate. 81MM SYSTEM | Hirtenberger Defense Systems The 81mm weapons platoon consisted of the headquarters platoon and four mortar squads. 81mm 120mm 60mm . 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. If required, the gunner/assistant gunner lowers the barrel so that the breech plug engages with the open end of the socket, and he uses the barrel as a lever to move the socket. f. Installation. d. The gunner recovers the baseplate to the area designated by the squad leader. It has a time setting of up to 50 seconds. b. Target terrain, such as ice and dry sand, gives lowest burst heights, whereas water and wet ground give highest burst heights. (d) Firing is slowed if mask clearance must be checked before each firing but this can be eliminated if minimum mask clearance is determined. 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. M3A1 Baseplate a. Cartridges are shipped with a complete propelling charge, an ignition cartridge, and primer. 0.30, BROWNING, M1919A4, M1919A5 AND M1919A6 {TO 39A-5 AF-32} (S&I BY PROP SEE DETAILS, FOOTNOTES), GUN, MACHINE, CAL. b. b. (a) Since the mortar is normally mounted in defilade, there could be a mask such as a hill, tree, building, or rise in the ground. 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 . M252 81mm Medium Mortar (2) The M524-series fuze has two function settings: superquick/impact (SQ/IMP) and delay. Barrel (with blast attenuator device) (703) 614-3727, Office of the Chief Information Officer 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.
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