The Klimov TV3-117 is a Russian gas turbine aero engine. It is used in most medium lift, utility, and attack helicopters designed by the Mil and Kamov design bureaus. The TV3-117 turboshaft engine was developed in 1974. Later the Klimov TV3-117 was installed on 95% of all helicopters designed by Mil and Kamov Engineering Centre. The engine has been produced in many variants.
("VM" stands for "high altitude, modernized") for Mi-28 helicopters and later installed also on Mi-8MT/Mi-171 models. This engine features an automatic switch to emergency power. It was awarded type certificates by the IAC Aviation Registry, India, the Republic of China and the People's Republic of China. Mass-produced since 1986
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The Mi‐8/17 boasts an ever‐expanding range of operational capabilities thanks to Russian Helicopters ongoing upgrade programmes. The helicopters can be fitted with a wide range of additional equipment to tackle a variety of missions.
- The basic Mi‐8/17 model is the cargo helicopter, which can transport up to 4,000 kg of various kinds of cargo either inside the cabin or on an external sling.
- The passenger helicopter can carry up to 26 passengers. The helicopter boasts low levels of noise and vibration, is fitted with cabin climate‐control systems, and has emergency exits that meet the latest safety standards. Everything is designed to ensure passenger in‐flight comfort and safety.
- The VIP model is designed to accommodate 7‐14 passengers with enhanced levels of comfort. The helicopters interior is customisable to customers needs and wishes. The helicopter boasts the largest cabin in its class, and is ideally suited to luxury‐class equipment. The VIP model can be fitted with entertainment systems, satellite links and special communications equipment in line with client needs.
- The search‐and‐rescue model can fly search‐and‐rescue operations around the clock in all weathers. The helicopter is fitted with special equipment including searchlights, winches, speakers and radiolocation systems. This model is used by Emergencies Ministries in countries across the world.
- The Mi‐8/17 flying hospital is designed to offer medical assistance in remote and hard‐to‐access regions. Special on‐board equipment provides life support and first aid to patients during the journey to hospital. Special sheeting used inside the cabin can be disinfected quickly and to high medical standards.
- The firefighting model is designed to tackle blazes using a helicopter bucket on an external sling, which can deliver up to 4,000 litres of water and target the burn zone with a high degree of accuracy. The helicopter can also deliver firefighting crews and special equipment to firefighting areas.
More than 12,000 Mi‐8/17 helicopters have been produced to date a record for twin‐engine helicopters anywhere in the world. They have been supplied to more than 100 countries worldwide and racked up total flying time of about 100 million hours.
Currently, the following civilian models of the Mi-8/17 type are produced: Mi-8AMT, Mi-8MTV-1, Mi-171, Mi-171A1 and Mi-172.