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http://dx.doi.org/10.5762/KAIS.2017.18.9.92

A Study on Quality Improvement for the Prevention of Water Infiltration and Corrosion of Helicopter MRA Control-Rod  

Lim, Hyun-Gyu (Defence Agency for Technology and Quality)
Choi, Jae-hyung (Defence Agency for Technology and Quality)
Kim, Dae-Han (Defence Agency for Technology and Quality)
Jang, Min-Wook (Defence Agency for Technology and Quality)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.18, no.9, 2017 , pp. 92-100 More about this Journal
Abstract
The Helicopter MRA Control Rod System has the important function of controlling the speed, height, and direction of helicoptersby adjusting the main rotor disc. However, the ingress of water into the inner control rod can cause ice damage in the rod during winter operation and also corrosion;these defects need to be rectified. The water flowed into the control rod through the upper side space, and the rod was cracked during icing expansion occurring at low temperature. The corrosion occurred due to the lack of coating process during the manufacturing process. To resolve these problems, the upper rod was sealed to prevent water inflow and a coating process was added to prevent corrosion. These solutions were verified by awaterproof test and a salt fog test. The phenomena, causes and measures were reviewed and the methods of improvement were established and proven. This proposed technology to prevent water infiltration and corrosion will contribute to the safety of rotary wing aircraft.
Keywords
Control Rod; FSP(Flight Safety Part); Helicopter; MFCS; MRA;
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  • Reference
1 KDS 1520-4001, "HELICOPTER, UTILITY", Defense Acquisition Program Administration, Mar. 2013.
2 KDS 1680-4005, "FLIGHT CONTROL GROUP", Defense Acquisition Program Administration, Mar. 2013.
3 TMK1(3)-1520-303-23(1/24), Helicopter Utility KUH-1, 2013.
4 AMS2253 'Tolerances Carbon and Alloy Steel Tubing' Aerospace Material Specification Nov. 2013.
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