Light mortars 81 mm type M69B(D) are light-weight infantry supporting weapons. They are designed for destruction of manpower and firing positions in open field and in defilades. Mortars are well suited to engage targets in gullies and shell craters. They can be used to breach wire obstacles and to blind enemy observa¬tion posts. Illuminating ammunition is also available. Light mortar 81 mm is characterized by low mass of 47.1 kg, by simple and reliable construction, considerable range and other features not available on mortars of earlier designs. It can be fired in all kinds of terrain and it uses all types of 81 mm mortar shells. Transporting is on soldiers’ back or by animal pack. The mortar is dismantled in three sections: barrel with breech piece, bipod and ba¬se plate. There are three carriers for man pack and one carrier for ammunition.
The weapon is rapidly and simply set in firing position. It is operated by the crew of three. Azimuth and elevation devices are of screwed type.
Sighting device NSB-3 uses collimator and division of 1/6400 or 1/6000. For night-time firing, it is fitted with illuminated aiming point. Graduation and bubble levels are coated with tritium and clearly visi¬ble at night.
Bipod contains mechanisms for coarse and fine barrel aiming.
The mortar is made of the highest quality materials and uses a number of light alloy components. A number of parts are interchan¬geable.
Radius of the shell lethal effect is 18 m, for targets in standing position 30 m.
Firing modes (with full charge)
Maximum duration of fire Number of shells
- 3 (minutes) 45
- 5 (minutes) 60
- 10 (minutes) 90
- 20 (minutes) 120
- 30 (minutes) 150
- 60 (minutes) 180
- each following hour 100