FIELD: aeronautical engineering. SUBSTANCE: cooling system is provided with emergency cooling device made in form of reservoir containing cooling agent (for example, water) with unit for supplying the cooling agent to oil sump cavity pipe line. Emergency cooling device is switched on by the pilot's command. EFFECT: maintenance of serviceability of primary gearbox in case of failure of air cooling system in oil cooler or in case of loss of oil for half an hour sufficient for completion of flight and safe landing of helicopter. 2 cl, 1 dwg
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