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e. Care, Handling, and Preservation. This unit HE ammunition is used against personnel and materiel. The kill radius of the 10-pound HE round is approximately 35 meters. They should not be approached for 5 minutes or disturbed for at least 30 minutes after firing. Each squad member should be able to perform all the following premount checks: a. He lays for deflection, taking the proper sight picture. a. (e) If the mask is not regular throughout the sector of fire, the gunner determines the minimum mask clearance as described above. It is set using the bladed end of the M18 fuze wrench. e. The squad leader picks up the aiming posts and sight. a. (1) The barrel is clean and free from grease and oil both inside and out. The minimum range for M889 ammunition is 83 meters. An 82mm variant was developed by the Soviet Union, which has the advantage of being able to use captured NATO ammunition but the 81mm could not use 82mm. Has two function settings: Superquick/impact (SQ/IMP) and delay. Added more info for M819, M821, M853, M889 (3) From this train, extend a starting train that will burn against the wind of single increments laid end to end. b. The smoothbore, muzzle-loading M252 medium weight mortar system offers up accurate long-range indirect fire support to American ground forces. [M4 exclusive parts]. --81mm mortar mount base. This round must be stored in a vertical position. 2007 ARMY PROCUREMENT OF AMMUNITION Budget Estimate. The safety wire must be removed before firing. High explosive--M821, M889, M374-series, and M362. If water is not available, the gunner must stand clear of the mortar until the barrel is cool. Between this and its minimum . ClampNOMENCLATURE, *M3A1 Baseplate: The baseplate is of one-piece construction, and 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. Mortar Squad, Heavy Weapons Company 1942 - Mortars provide indirect suppressive fire from hidden positions. The pile is covered with a double thickness of tarpaulin. It comes preset to function on SQ/IMP, and the selector slot should align with the SQ mark on the ogive. The M751 fuze is the only dummy fuze used with the 81-mm mortar. The fuze body is graduated from 0 to 50 seconds in 2-second intervals; 10-second intervals are indicated by bosses. Types of rounds, classification, and characteristics for the 81-mm mortar, M252. The cartridges are painted olive drab with yellow markings. The section leader, acting as FDC, has one deflection instead of two or more. 60 mm ULTRALIGHT MORTAR ANTOS Commando . 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. 2011-05-13 Australian 81mm Improved Mortar, B-GL-385-017/PT-001 81 mm MORTAR - - 81mm mm Mortar i FOREWORD 1. The maximum range for M889 ammunition in the conventional mode is 5,608 meters. . MechanismTraversing MechanismMechanical LegFixed Leg Barrel b. Learn vocabulary, terms, and more with flashcards, games, and other study tools. The M853 cartridge (M252 only) has a cylindrical body that contains an illuminating candle and parachute assembly. The M853 and M301A3 illuminating ammunition are described herein. --M4 dedicated troop room. Study sets, textbooks, questions. To the best of my knowledge all military data and images presented in these pages are UNCLASSIFIED, NON-SENSITIVE, and approved for public release. If the round fires, the mortar is re-laid on the aiming point and firing is continued. The High Explosive 81mm mortar bomb L41 series is fitted with the Mk4 Charge System and employ a spheroidal cast iron bomb body, which combined with a high energy explosive filling, provides optimised fragmentation. The maximum rate of fire is up to 30 rounds per minute and the duration is up to 2 minutes. In any case, the gunner must ensure that the cartridge does not strike an obstacle. The gunner can depress the barrel, if necessary, to provide easier access to the firing pin. Flashcards. 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. To convert the fuze from PROX to SQ/IMP, the top of the fuze must be rotated 120 degrees (one-third turn) in either direction. More uniform firing is obtained if ammunition is kept at the same temperature. B-GL-385-017/PT-001 Weapons 81 mm Mortar is issued on the authority of the Chief of the Land Staff. Medium mortars (61-99 mm) can fire at ranges of 100 m to 5500 m, while heavy mortars (100-120 mm+) have a range of some 500 m to 9,000m. IM (impact) causes the cartridge to explode on contact. Broken into these major components, as well as associated equipment for fire control, it is the heaviest mortar that can be carried by foot soldiers. b. The M374 cartridge is fitted with the M90 propelling charge. System (including basic issue items) This page was last modified 01:37, 11 August 2010. The wrench (P/N 9349539) sets M772 MT and M768 time fuzes. Gary's U.S. Infantry Weapons Reference Guide, 90 to 150 by 30 to 40 meters for 2 to 3 minutes. Disposal Precautions. What is the range of a 105mm howitzer? To make the shift, the gunner places the fingers of his right hand in the muzzle and his left hand on the left leg. Table 4-2. The 60,, M70 commando type Maximum range 1630m It uses the same shells as the previous. (3) The M84A1 fuze is a single-purpose, tungsten-ring, mechanical-time fuze used with the 81-mm M301A3 illumination cartridge. The propellant increments are ignited, which produce rapidly expanding gases that force the cartridge from the barrel. The fuze setter, M25, sets M84-series time fuzes. The round is still safe to handle and transport if the safety wire is reinserted. socket in the baseplateRotatable Socket CapNOMENCLATURE, *M64A1 Sight Unit: This unit provides self-illuminating sighting The adjustment ring has six raised ribs for use in conjunction with fuze setter, M25, and a setting indicator rib (marked SET) about half the height and width of the other six ribs. The assistant gunner cleans the bore and swabs it dry. The fuze consists of a brass head, body assembly, and expelling charge. The safety pull wire is removed just before inserting the cartridge into the mortar. b. This cartridge is ballistically matched to the M374A2, M374A1, and M375 HE cartridges, and weighs about 9.12 pounds. b. The fuze should already be fitted to the cartridge. --M4 exclusive sheet. The maximum effective firing range is 5,700 meters, with a minimum range of 80 meters (that's really close). The fuze has a safety wire that must be removed before firing. What is the kill radius of a 81mm 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. At the muzzle end is a (4) The blast attentuator device is secured correctly. M64A1 Sightunit. Baseplate placed against baseplate stake. The contents of ammunition containers are shown by markings. 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. (1) The rotating socket is free to move in a complete circle. 60mm and 81mm mortar 10. The cartridges are returned to their original containers. (6) The primer cartridge is checked for damage or dampness. Shortly before midnight on July 12, 1970, Alpha Company of the 2nd Battalion, 501st Airborne Infantry Regiment, detected movement about 200 meters below its landing zone on a hill. 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. In the U.S. Army and U.S. Marine Corps, it is normally deployed in the . Mortar, 81mm M1 size Scroll Minimum range in the high-angle indirect fire mode is 80 meters, although some mortars can be aimed horizontally in direct fire, often for final protective fire . Ammunition is typed according to use (Table 4-2). (See FM 7-90 for a discussion of the duties of the platoon headquarters.). "81mm rounds have a maximum effective range of 5,608 meters," said Leininger. The safety pull wire is removed just before inserting the cartridge into the mortar. Figure 4-4. d. Climatic Effects. With the mortar mounted and the sight installed, the gunner lays the sight on the two aiming posts (placed out 50 and 100 meters from the mortar) on a referred deflection of 2800 mils and an elevation of 1100 mils. Barrel (with blast attenuator device) 60mm range from 70 m to 3 1/2 km, and accuracy depends on the spotter calling in the mission and the crew that's laying in When the gunner is satisfied with his sight picture he announces, "Up.". d. The gunner recovers the baseplate to the area designated by the squad leader. (5) Do not leave unused increments unburned in combat operational areas. Types of rounds, classification, and characteristics for the 81-mm mortar, M29A1 (Standard B for the 81-mm mortar, M252). (2) The breech plug is screwed tightly to the barrel. The equipment is placed out the same as for the gunner's examination (Chapter 9). 81mm L16 mortar An 81 mm mortar is a medium-weight mortar. Test. Is a radio doppler fuze that has a proximity (PROX) or SQ/IMP function. 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. Answer the following questions about the FCA ? effect)Deflection(2850)Charge(2)Elevation(1150), *Question: In firing with a FDC, the initial fire command gives 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. Match. (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. The floating firing pin located within the primer has approximately 1/16 of an inch to move around. Short cartridges can be expected when firing below charge 4. d. The gunner rough levels the cross-level bubble by making the bubble bounce from one side to the other. What restrictions are to be enforced during training when firing rate 12, What should a MFC know before crossing the line of departure, What are the consideration when sighting an op, What two things could happen if the MFC doesn't check the belt, List the 4 options the MFC has to correct a incorrect belt, The aim of adjustment is to obtain an accurate charge bearing and elevation to a target with minimum expenditure of time and ammo so that effective fire can be brought to bear on to the target, List the MFC considerations before adjustment, MFC considerations before fire for effect. He ensures that the firing pin recess is facing upwards. The gunner should expose 6 inches (150 millimeters) of elevation shaft and center the buffer carrier. 2005 ARMY PROCUREMENT OF AMMUNITION Budget Estimate. The second ammunition bearer retrieves the aiming posts. In addition to supervising the emplacement, laying, and firing of the mortar, he supervises all other squad activities. If not, he may still fire at the desired range by selecting a charge zone having a higher elevation. He uses the chain of command to assist him in effecting his command and supervising duties. b. The range of any given mortar's projectiles can be adjusted by the user. b. The 81-mm mortar, M252, is a smooth-bore, muzzle-loaded, high-angle-of-fire weapon. Americans also report the effectiveness of German mortars in Italy, at least until late 1944 and 45 when the US Army started to use an antiaircraft radar originally designed to accompany the US Army's 90mm AAA gun in the counter-battery radar role. f. Installation. The entire squad stays with the mortar. Complete cartridges are always handled with care. The M2 is a more "portable" piece of equipment, capable of effective indirect fire at close range and capable of operating closer to frontline infantry action, with portability being a major selling point. 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