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Experience in operation of trucks shows a significant increase in a failure number of their systems and parts in natural and climatic conditions of a permafrost zone compared with the conditions of a moderate climate. This article presents a study of operability of the forty MAN F2000 trucks used in Yakutia for long-haul transport. The systems were identified that limit reliability of these vehicles in the severe operation conditions of the North. These are an engine, suspension and brake system. Regularities of changes in the main operability parameters (operating time to failure and operating time between failures) of these systems and truck as a whole were investigated. Regression models of dependences of the operating time between failures on truck mileage for the engine, the suspension and brake system show a significant decrease in this operating time with the increase in the mileage. Taking into account this decrease, an improved technique of calculating the planned repair number for the systems and parts of automobiles, based on statistical information about the failures of these assembly units in the specific operation conditions is proposed. This technique can be used when planning the repairs of the vehicles with the different mileage and calculation of the required number of the spare parts. Keywords—truck; operability; operating time to failure; operating time between failures; mileage; natural and climatic conditions of the North

Operability of MAN F2000 Trucks in the North