Its postharvest processing among which the processes of operation of active aeration have essential value is of great importance for grain production. It is known that operations of active aeration are carried out by installations of stationary, figurative, telescopic types. However, these installations are not adapted to unloading grain and to transporting it on other operations, for example cleaning or drying. To perspective installations equally carrying out both active aeration, and unloading by forced air are used for these purposes, aero trenches, in particular three-channel design. The research objective was to check the operability of aero trench with the sensor in the mode of active aeration and pneumounloading. The research problems were: 1) to check operability of instal-lation with the motion sensor in two modes; 2) to investigate the uniformity of air distribution when unloading; 3) to investi-gate the productivity of pneumounloading of grain weight. The design of a three-channel aero trench with a new constructive element in the form of grain motion sensor is given in the study. The development and research of its working capacity are made at the East Siberian University of Technology and Management. For the research grain materials (wheat, oats and barley having humidity respectively 19, 20 and 18 %) were used. The installation had dimensions 3.0 × 0.5 × 1.0 m with sizes of bunker of 2.0 × 0.5 × 1.0 m, the channels of 2.0 m long, the width of the main transporting channel of 0.2 m, lateral canals 0.15 m wide. The material of production of aero trench and its details is a thin-sheet galvanized tin. The operability of aero trench with motion sensor in two modes is established. It is defined that the productivity of unloading is stable with the motion sensor, making at the beginning of unloading 1.5 kg/s, by the end - 1.15 kg/s. Un-productive consumption of air is excluded, the electric power expense is respectively reduced. Uniform distribution of iso-bars in grain weight both on length, and on aero trench width is established. Stability of productivity of unloading, uniformity of distribution of isobars of static pressure testify to the uni-formity of air distribution in grain weight both on length, and on width of grain weight is established.