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 M is a standard point-detonating fuze M with both impact fj 0. The cannon assembly Figure has one end closed by a base cap. Ammunition should be protected from mud, dirt, sand, water, and direct sunlight. The change in elevation is not less than mils and not more than mils for the mm mortar.

FM Chptr 9 Gunner’s Examination

The number of rounds, type of round, fuze setting, and charge are all included in the fire command. He then selects a mounting azimuth from the azimuth measured to the mortar sight.

The mortar is mounted with the appropriate or proper sight installed. 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. The candidate is given one assistant to shift the bridge or bipod assembly. His credit score is the total of the two trials. If the round fails to come out once the barrel is lifted, the barrel is lowered back to the horizontal.

He shakes the barrel to dislodge any debris and swabs the bore. Once the barrel reaches the horizontal position, the squad leader extends the meaty portion of his thumbs over the end of the muzzle. The M, M, and M cartridges designed specifically for M mortars can be fired in the M19 mortar at reduced charges: It is used to lock the elevation housing in place.


The moisture-resistant seal of the shipping container should not be broken until the ammunition is to be used.

He then lowers the barrel to its minimum elevation and backs off one-quarter turn. For additional information, see the Global Shipping Program terms and conditions – opens in a new window or tab.

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

Unit equipment should be used in the examination; however, it should be the best available. The candidate must repeat all commands.

Each squad member is cross-trained to perform mortas duties involved in firing the mortar. 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 emplacement is marked before the examination. The organization prescribed in Table is recommended for the conduct of the gunner’s examination. This item will ship to United Statesbut the seller has not specified shipping options. An item that has been used previously.

The gunner notifies the squad leader of the minimum mask clearance elevation. Learn More – opens in a new window or tab Any international shipping is paid in part to Pitney Bowes Inc. It has a maximum range of meters and a minimum range of 56 meters. The candidate carries his scorecard Figure from modtars to station. If the round fails to dislodge after trigger firing and mortasr, the gunner places the selector switch on SAFE.

If the same round misfires, he repeats the misfire procedures. He determines mask and overhead clearance by sighting along the top of the barrel gm his eye placed near the base plug.

At the first lull in firing, the gunner must determine whether the displacement is caused by traversing the mortar or by displacement of the baseplate assembly. The propelling charge may not function for the following reasons:. This examination tests the gunner’s ability to perform basic mortar gunnery tasks with the track-mounted mortar system. The entire refer and realign station is eliminated, and the procedures for direct lay are used. The M round with multioption fuze M has four settings–proximity, near-surface, impact, and 0.


This procedure ensures that, after a registration mission using ,ortars parallel sheafthe mortars have matching deflections.

M 60mm Light Mortar

The commander having authority to issue special orders appoints the board. Upon completion of these actions, the candidate centers the traversing assembly and, with the help of the other assistant, moves the turntable and re-lays on the aiming posts.

The ammunition bearer places the outer edge of the baseplate against the baseplate stake. The mount is folded back underneath the barrel until the elevating mechanism latches to the collar assembly. See all condition definitions – opens in a new window or tab The candidate receives an administrative command with a deflection of or mils.

The assistants must remain in their normal positions until the elevation element is given. Each gunner checks his sight picture.

With practice, they can establish a smooth flow of rounds. If no water or snow is available, the barrel is air cooled until it can be easily handled with bare hands. The candidate is given three trials.

He ensures the barrel is up and pointing downrange.

If the mortar section is to operate quickly and effectively in accomplishing its mission, mortar squad members must be proficient in individually assigned duties. The gunner is on the left side of the mortar where he can manipulate the sight, elevating gear handle, and traversing morrtars wheel.

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