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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The item you’ve selected was not added to your cart. The hand crank is turned clockwise to move the barrel to the right, and counterclockwise to move the barrel to the left. Preparatory instruction for the gunner’s examination teaches the soldier how to properly and accurately perform the gunner’s duties. He moves to the front of the bipod and faces it, kneels on his right knee with his left hand on the gear case, and loosens the locking nut.

Placing the mortar into a firing position from the traveling position Small deflection change 2-90 the sight and realigning the aiming posts Large deflection and elevation changes Reciprocally laying.

The gunner is on the left side of the mortar where he can manipulate the sight, elevating gear handle, and traversing assembly wheel. Learn More – opens in a new window or tab Any international shipping is paid in part to Pitney Bowes Inc. As soon as the sight data are announced, the gunner places it on the sight, elevates the mortar until the elevation bubble floats freely, and then centers the traversing mottars.

He uses the chain of command to assist him in effecting his command and supervising 23–90. In laying the mortar for direction, the two aiming posts do not always appear as one when viewed through the sight.


He then detaches the hook and unwraps the cable assembly. See all condition definitions – opens in a new window or tab He is allowed to start the test with his hand on the deflection knob of the sight. He aligns the left edge of the cutout portion of the baseplate with the right edge of the baseplate stake. For the mm, the turntable is centered, the traversing mechanism is within four turns of center of traverse, and the traverse extension is centered and locked.

During peacetime live-fire training, the gunner signals the squad leader to come forward once the barrel is cool.

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

This procedure ensures that, after a registration mission using a parallel sheafthe mortars have matching deflections. 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. He moves forward of the baseplate about 12 to 15 inches and faces the baseplate vm line with the left edge gunner’s viewpoint of the baseplate.

When fired from the M mortar, greater ranges are achieved than those shown in the M2 and M19 firing tables. Crew training achieves the speed, precision, and teamwork needed to deliver responsive and effective fire on target.

The turntable is centered, and the traversing mechanism is within two turns of center of traverse.

FM Chptr 9 Gunner’s Examination

Have one to sell? The sight is laid on two aiming posts placed mortafs 50 to meters from the mortar on a referred deflection of mils mils elevation for the mm. All firing malfunctions should be considered a misfire.


A different command is given for each trial. The gunner places his left hand on the midsection of the traversing slide and his right hand on the mechanical leg, and he extends the bipod legs the length of the cable assembly.

The underside of the baseplate has four spades to stabilize the mortar during firing. This examination tests the gunner’s ability to perform basic mortar gunnery tasks with the ground-mounted mortar system. Support squads are located in cavalry units, task units, and light infantry units.

The candidate must repeat all commands. The carrying position can be in the upper or lower saddle, depending on the mission or enemy situation. That setting is the minimum mask clearance. The candidate may proceed with the exercise as soon as the deflection element is announced. They are in position at the start of the examination.

The candidate is directed to mount the mortar with his authorized assistants. The gunner’s examination for the support squad is the same as that used by the mortar section, except for the reciprocal laying, and refer and realign stations.

The sight is laid on two aiming posts placed out 50 and meters from the mortar on a referred deflection of mils and mils elevation for the 4. He prevents any part of his body from passing in front of the muzzle.

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