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K0-0 항공기 사출좌석 부품에서 발생한 입계균열에 대한 연구
윤용인(Yonug-In Yoon),박준한(Jun-Han Park),손경숙(Kyung Suk Sohn),정대한(Daehan Jung) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
K0-0 which has a turboprop engine of 950 hp is a first aircraft developed by Korean technology and is used a training aircraft for Republic of Korea Air Force's pilots. The localization rate of K0-0 is 65% but a ejection seat for emergency escape is made in Martin-Baker Co. of England. It happened a failure on HPRU(Harness Power Retraction Unit) go-forward torque bar which is a K0-0 aircraft's part of ejection seat in 2008 April. It happened a crack on shaft of a HPRU's part which select manual lock or unlock and HPRU is like as safety belt of automobile. As a result of failure analysis, failure mode is grain boundary fracture and root cause of failure is due to lead segregation in lead-brass.