1957 90 Mm M12b2 Drill Cartride

DODAC 1315-CA09

Drawing 12957039

Limitations:

None

References: TM 9-1010-223-10 TM 9-1300-251-20 SB 700-20 SMC-P 700-3-3

DOD Consolidated Ammunition Catalog

CARTRIDGE, 120 MILLIMETER: ILLUMINATING, IR, M983 WITH FUZE, MECHANICAL TIME

SUPERQUICK: M776

Ammo Dodic Quick Reference Sheet

Type Classification:

Use:

This cartridge is an infrared illuminant round developed for use in the M120 and M121 120mm mortar system. It is intended for use with Night Vision Devices (NVD's) to reduce friendly force's exposure to the enemy.

Description:

The complete round consists of a fuze, propellant charge, fin assembly, ignition cartridge, body tube, tail cone assembly, illuminant candle, and parachute assembly. The ignition cartridge has a percussion primer and is assembled to the end of the fin assembly. The propellant charge is contained in four horseshoe-shaped felt fiber containers and assembled around the fin assembly shaft.

Functioning:

When the cartridge is dropped down the mortar tube, the firing pin at the bottom of the tube initiates the percussion primer and charge in the ignition cartridge. The charge in the ignition cartridge flashes through the holes in the shaft of the fin assembly and ignites the propelling charge. The gases from the burning propellant expand and propel the cartridge out of the mortar tube. The fuze functions depending on the fuze setting and ignites the expulsion charge, ignites the first-fire candle, and ejects the candle assembly. A spring ejects the parachute from the tail cone. Parachute assembly opens and deploys. The candle assembly provides illumination for 50 seconds.

Tabulated Data:

Complete Round:

Type -------------------------------- Infrared Illuminating

Assembly drawing number------ 12967862

Projectile:

Body material ---------------------- Wrought carbon steel

Color -------------------------------- White w/black markings and orange band

Filler and weight ------------------ Illuminant, Infrared (IR) 2.65 lb, (1200 g)

candlepower/ sec max

Components

Temperature limits:

Firing:

Storage:

*Packing: ------------------------------ 1 round per fiber container; 2 containers per metal container

Fiber container:

Drawing number-Metal Container: Drawing number-

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