This study is to deal with a failure phenomenon that occurred during a vibration test on an Inertial Navigation System mounted on a self-propelled howitzer. Vibration occurs naturally due to the operation characteristics of self-propelled howitzers, The study describes a case of failure that occurred during the durability verification process. It explains the function and configuration of the INS(Inertial Navigation System) and describe how the failure occurred through understanding the phenomenon. Based on the occurrence phenomenon, an in-depth cause analysis was conducted and fundamental improvement measures were presented to prevent recurrence. It is expected that this study will aid as a reference for problem solving when similar failures occur in the future.

Abstract
1. 서 론
2. 관성항법장치 구성 및 고장발생 현상
    2.1 관성항법장치 내부 구성
    2.2 관성항법장치 고장발생 현상
3. 고장원인 분석
    3.1 항법컴퓨터 세부 검토
    3.2 부품 간섭에 대한 설계검토
    3.3 항법컴퓨터 진동충격 해석
4. 고장 개선방안 검토
    4.1 대체 부품 적용 검토
    4.2 부품 실장위치 변경을 통한 부품 간섭 개선
    4.3 케이스의 물리 적 형상변경 검토
5. 결론 및 고찰
References

• 김현수(Defence Agency for Technology and Quality) | Hyunsu Kim Corresponding author
• 윤성호(Defence Agency for Technology and Qaulity) | Seongho Yoon
• 손민구(Defence Agency for Technology and Qaulity) | Mingu Son
• 성수민(Defence Agency for Technology and Qaulity) | Soohmin Seong
• 민홍주(Hanwha Aerospace Co., Ltd.) | Hongju Min