Each unit armed with a mortar weapon system gives examinations semiannually. Other units may conduct examinations or allow their eligible members to take. 90(FM ). MORTARS. DECEMBER DISTRIBUTION RESTRICTION: Distribution authorized to U.S. Government agencies and their contractors only. Title: FM 9DEC, Version: CHG-1, Date: Dec, Status: Active, Desc: FM (w/ CHANGE 1) MORTARS.

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FM Chptr 3 mm Mortar, M

Learn More – opens in a new window or tab. If an emergency requires trigger fire above charge 1, the baseplate must be well seated and extreme caution taken.

M, M, and M49A4. It can be drop-fired or trigger-fired mlrtars has five major components. He moves to the front of the bipod and faces it, kneels on his right knee with his f hand on the gear case, and loosens the locking nut. He uses the chain of command to assist him in effecting his command and supervising duties.

To make the shift, the gunner places the fingers of his right hand in the muzzle Figure and his left hand on the left leg, and moves the mortats until the vertical line of the sight is aligned approximately on the aiming post. Other offers may also be available. See all condition definitions – opens in a new window or tab As soon as the mortar is laid, he announces, “Up. The standard B rounds shown in Figure are available for training with the M Learn more – opens in a new window or tab.

The traversing mechanism moves the collar assembly left or right when the traversing hand crank is pulled out and turned. Please enter a number less than or equal to 1. The gunner must be sure the round does not strike any obstruction.

The lower saddle is used when firing at elevations of to moratrs the upper saddle is used when firing at elevations of to mils. All other mortars require a change in deflection of 20 to 60 mils and an elevation change of 35 to 90 mils.


Crew training achieves the speed, precision, and teamwork needed to deliver responsive and effective fire on target.

Diagram of equipment layout and position of personnel for the gunner’s examination mm mortar, M Once the barrel reaches the horizontal position, the squad leader extends the meaty portion of his thumbs over the end of the muzzle. As soon as the sight data are announced, the gunner places it on the sight, elevates moryars mortar until the elevation bubble floats freely, and then centers the traversing bearing.

He should tap up on the bottom of the sight to ensure proper seating. In TOE units, squad members should be rotated within the squad so that each member can become proficient in all squad positions. When there is a mechanical failure and a mortar fails to maintain the lay after the candidate announces, “Up,” a board member twists or pushes the mortar taking up the play without manipulation until the cross-level bubble is within the two outer etched lines.

Central MN Auctions central-mn-auctions The M short-range training round SRTR cartridge Figure can be fired from the mm mortar using standard sight and fire control equipment and firing table FT P After the mortar is mounted, the gunner checks it thoroughly. If dented, the round should not be fired.

The carrying position can be in the upper or lower saddle, depending on the mission or enemy situation. The gunner moves to the mechanical leg side and supports the bipod with his left hand on the shock absorber.

It is used to lock the elevation housing in place. The change in elevation is not less than mils and not more fmm mils for the mortard mortar. Powder increments that have been removed should be replaced. Placing the mortar into a firing position from the traveling position Small deflection change Referring the sight and realigning the aiming posts Large deflection and elevation changes Reciprocally laying.


The ammunition bearer secures the baseplate. The candidate is tested at Station No. If the elevation is between to mils, the cannon is mounted in the lower saddle. Those failing the examination should be retrained for testing at modtars later date.

Any target that requires that elevation mortar lower cannot be engaged from that position. EOD personnel are notified for removal or disposal.

The procedures for removing a misfire are different for handheld and conventional modes.

The hand crank is turned clockwise to depress, and counterclockwise to elevate. This actually measures the angle between the posts.

FM 23-90 (w/ CHANGE 1), ARMY FIELD MANUAL: MORTARS (09-DEC-2002)(TO 11W2-5-13-21)

In the past, mortar crews, trying to produce and maintain a high rate of fire, have used the two-man loading method. Before the mortar is mounted, the squad must perform premount checks.

If the round fails to come out once the barrel is lifted, the barrel is lowered back to the horizontal. Mortaes has a maximum range of meters and a minimum range of 56 meters.

The bipod should be connected to either the upper or lower saddle of the barrel.

The squad leader picks up and places the sight case and two aiming posts at the exact position where the mortar is to be mounted. The candidate receives an administrative command with a deflection of or mils. The candidate is given two trials; his credit score is the total of these two trial scores. This assembly consists of an elevating spindle, screw, hand crank, and housing elevation guide tube.