AC-40 (131) model 137 - fire tank truck on the chassis of an all-wheel drive truck ZIL-131. It is intended for delivery to the fire site of a combat crew of 7 people, fire equipment, water and a foam concentrate, as well as for extinguishing a fire with water from a tank, an open reservoir or a water supply network, air-mechanical foam using a foam concentrate brought or taken from an outside tank.

The main elements are prepared for TurboSmooth smoothing (2 Iteration). The elements of the body, equipment, wheels, interior have been worked out conditionally.