항공전자장비의 운용자료 분석을 통한 신뢰성 성장 연구

Abstract

In aerospace industry, MTBF (Mean Time Between Failure) and MFTBF (Mean Flight Time Between Failure) are generallyused for reliability analysis. So far, especially to Korean military aircraft, MFTBF of avionic equipments is predicted byMIL-HDBK-217 and MIL-HDBK-338, however, the predicted MFTBF by military standard has a wide discrepancy to that ofreal-world operation, which leads to overstock and increase operation cost. This study analyzes operational data of avionicequipments. Operational MFTBF, which is calculated from operational data, is compared with predicted MFTBF calculated conventionallyby military standard. In addition, failure rate trend is investigated to verify reliability growth in operational data, theinvestigation shows that failure rate curve from operational data has somewhat pattern with decreased failure rate and constantfailure rate.