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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Cartridges must be free of such foreign matter before firing. For additional information, see the Global Shipping Program terms and conditions – opens in a new window or tab This amount includes applicable customs duties, taxes, brokerage and other fees.

He then aligns the center of the bipod assembly with the center of the baseplate. When the aiming posts appear separated, the gunner cannot correctly use either one of them as his aiming point.

He unscrews the collar locking knob to open the collar. A mortar is mounted with the sight installed. Special financing available Select PayPal Credit at checkout to have the option to pay over time.

If a round set for near-surface burst NSB fails to burst morgars the near-surface distance above the target, it automatically bursts on impact. The ammunition bearer receives information in a fire command sent by the FDC and prepares the ammunition for firing. A single loader can fire almost as fast with less chance of double-loading.

WWII FM 81mm MORTAR M1 May 7 Book US ARMY MILITARY WW2 Artillery . | eBay

Diagram of equipment layout and position of personnel for the gunner’s examination mm mortar. If he takes the mortarx trial for record, then he must take the second trial for record even if he fails it.

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 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. Conditions should be the same for all mlrtars during the test.


If it is obvious to mottars squad leader that the round has reached the bottom of the barrel and it has failed to ignite, the gunner places the selector switch on trigger fire and squeezes the trigger several times to try to clear the round. As soon as the sight data are announced, mortras gunner places it on the sight, lays the mortar for elevation, and then traverses onto the aiming post by turning the traversing handwheel and the adjusting nut in the same direction.

It consists of seven subassemblies.

If he chooses to use the first trial as practice, then he must use the second and third trials as record. Delivery times may vary, especially during peak periods. Each squad is equipped with a complete M mortar baseplates, barrel, bipod, sight, and aiming stakesfire control equipment binoculars, M2 compass, mortar ballistic computer, and plotting boardand a TA-1 telephone. Shipping cost cannot be calculated. 23–90 mortar can be carried by one or two men for 23-990 distances.

For the first trial, using the 4. The change in elevation causes him to elevate or depress the barrel from low range to high range, or vice versa. The item you’ve selected was not added to your cart. Contact the seller – opens in a new window or tab and request a shipping method to your location. This is a precaution if the charge changes during adjustment.

The section sergeant has a boresight device and a radio. He rotates the barrel 90 degrees in the socket cap so that the flats on the barrel are aligned with the flats of the socket cap.

To do this, he places the referred initial deflection on the sight and lays on the aiming posts. He moves forward of the baseplate about 12 to 15 inches and faces the baseplate on line with the left edge gunner’s viewpoint of the baseplate.


Assisted by the squad leader or ammunition bearerhe makes large deflection shifts by shifting the bipod assembly. He rotates the barrel 90 degrees to lock it to the baseplate. If performed properly, the carrying handle is on the upper side of the barrel, facing skyward.

He prepares the ammunition and assists the gunner in shifting and loading the mortar. The gunner checks for heat with his fingertips only, starting just below the muzzle and working down to the base.

The mortas mechanism is used to elevate or depress the barrel by turning the hand crank at the base of the elevation guide tube. The mortar is within two turns of center 2390 traverse. The evaluator records the time and checks the candidate’s mortar after each command has been executed.

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

Learn More – opens in a new window or tab International shipping and import charges paid to Pitney Bowes Inc. Click here for more information. A mm subcaliber device can be inserted in the 4. The M can fire rounds in four minutes – a three-man crew can have 15 to 20 rounds in the air before the first round impacts.

Crew training achieves the speed, precision, and teamwork needed to deliver responsive and effective fire on target. Add to watch list Remove from watch list. The base cap end of the cannon has cooling fins on the outside, which reduce heat generated during firing.

If a round set for impact fails to burst on impact, it automatically bursts 0. The organization prescribed in Table is recommended for the conduct of the gunner’s examination. This examination tests the gunner’s ability to perform basic mortar gunnery tasks with the ground-mounted mortar system.

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