Technical Assessment of Hydraulic Systems Used in Mi-24 And Mi-35 Helicopter

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Addis Ababa University


Helicopter is known as a rotating wing aircraft that consists of different subsystems in it. These subsystems are very closely interlinked to each other that make the helicopters a typical example of mechatronic system. One of these subsystems is a hydraulic subsystem, which is usually used for actuating landing gears, flight control boosters, weapon system and other purposes. Thus, hydraulic system can be the main core of helicopter movement that needs a special consideration to assess. Currently, almost all Mi-24 helicopters in Ethiopian airforce are grounded or inoperative because of hydraulic related problems. The main problems include lack of reliable safety system for landing gear emergency extension, guidance device operation and directional control damper pressure loss. There are also other problems that led these helicopters to crash as shown from some safety records. Because of such problems, these helicopters couldn’t function their expected mission. Whereas Mi-35 helicopters are in a better performance of flight evenif some improvements and modifications are still required. Moreover this, difficulty of life-saving by parachute from the helicopter in flight lowers the confidence of pilots and flight technicians. This thesis work is mainly focused on how this problem or loss can be avoided by identifying the problems and proposing the possible solutions and remedies to be taken. Based on the two specified helicopters, a case study has been implemented from the available documents and past experience. And finally, different solutions are proposed and selected to upgrade the existing hydraulic system of both Mi-24 and Mi-35 helicopters.



Mechanical Engineering