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

ABSTRACT
 1. 서론
 2. 연구 배경
  2.1 MIL-HDBK-217F를 이용한 고장률 예측
  2.2 MFTBF 산출
 3. 운용자료 분석
  3.1 초기 신뢰성 예측과 운용MFTBF의 비교
  3.2 운용자료 고장률 추세 및 신뢰성 성장분석
  3.3 운용자료 신뢰성 성장분석의 고찰
 4. 결론
 참고문헌

• Jong Hun Park(Department of Business Administration, Catholic University of Daegu) | 박종훈
• Sang-Cheon Lee(Division of Industrial Systems Engineering,ERI, Gyeongsang National University) | 이상천 교신저자
• In-Tak Jo(Korea Aerospace Industries, LTD.) | 조인탁