• Title, Summary, Keyword: Defect & Failure Reporting

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Study on the implementation of malfunction, defect and failure reporting system to the korean indigenous aircraft (국내 개발 항공기에 대한 항공안전 고장보고 제도운용에 대한 고찰)

  • Park, Guen-Young;Yoo, Seung Woo
    • Journal of the Korean Society for Aviation and Aeronautics
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    • v.24 no.1
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    • pp.33-40
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    • 2016
  • ROK issued its first type certificate to the KC-100 airplane, Part 23 normal category, and become the State of Design (SoD) in 2013. Before this, ROK aviation regulations were focused on the operation and continued airworthiness of aircraft registered and operated in ROK that were designed and manufactured in another contracting state. Therefore the implementation of reporting system were restricted to gather the failure and service difficulty reports from the owners or operators and transmit the information to the State of Design and/or the manufacture relating to the type certificated aircraft. However, ROK, to fulfill the accountability of the State of Design, has to ensure there is a system to address the information received from the State of Registry on failure, malfunctions, defects and other occurrences that might cause adverse effects on the continuing airworthiness of the korean type certificated aircraft. This paper presents an overview of ICAO requirements for the State of Design, and current implementation of reporting system of USA and Japan and discusses the current status and further considerations on the rule-making for the malfunction, defect and failure reporting system applicable to the korean indigenous aircraft.

A study on Mass production stage Tank Battle Management System Environmental Stress Screening test method and application improvement based on Production process data (생산 공정 자료 기반 양산단계 전차 전장관리체계 환경 부하 선별 시험 방법 및 적용 개선에 관한 연구)

  • Kim, Jang-Eun;Shim, Bo-Hyun
    • Journal of the Korean Society for Quality Management
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    • v.43 no.3
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    • pp.273-288
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    • 2015
  • Purpose: In this study, we apply environmental stress screening (ESS) to battle management system (BMS) of a tank and use the ESS profile based on production process data, guided by MIL-HDBK-781/344/2164. Methods: To optimize ESS Profile of the BMS of a tank, we estimate ESS model parameters (e.g., defect density, screening strength) using primary production failure reporting and corrective action system (FRACAS) data of military supply contract firm. Results: First, we collect the Primary production FRACAS data of military supply contract firm. Second, we compute curve fitting approach to find patent defect density and latent defect density using FRACAS data. Third, we solve the equation of Defect Density(patent defect density + latent defect density)($D_{IN}$) and Screening Strength(SS) Using second step data. As a result of analysis according to the order, we calculate $D_{IN}$(Temperature stress case : 74.02, Vibration stress : 10.252) and : SS(Temperature stress case : 0.4632, Vibration stress : 0.4142) and confirm the Condition II-D based on MIL-HDBK-344. According to Condition II-D, it is necessary to modify existing ESS profile through decreasing the $D_{IN}$ and increasing the SS. Conclusion: Identification of defect causes through ESS approach reduce defect densities for production. It provides feedback to a lessons-learned data base to avoid similar problems on next generation tank BMS.

Effectiveness Analysis and Profile Design Automation Tool Implementation for The Mass Production Weapon System Environmental Stress Screening Test (양산 무기체계 환경 부하 선별 시험 효과도 분석 및 프로파일 설계 자동화 도구 구현)

  • Kim, Jang-Eun
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.17 no.8
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    • pp.379-388
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    • 2016
  • There are various system defects from weapons manufacturing due to the numerous production processes and various production environments. The first kind of defect is patent defects, which can be detected by visual inspection, functional testing, and existing quality control procedures during the manufacturing process. The second kind is latent defects, which cannot be detected though existing quality management approaches because of the complexity of the system and manufacturing process. To minimize the initial defect problems, environmental stress screening (ESS) is needed to detect the defects, remove them, and improve the product conditions based on the environmental stress conditions of temperature and vibration. We implemented a tool for quantitative ESS effectiveness analysis and profile design automation based on MIL-HDBK-344 and verified it using six scenarios with different temperature stress, vibration stress, and test designs.

A Case of an EXIT procedure for Airway management of fetus with Agnathia (하악결손증 태아에서 기도확보를 위해 시행한 EXIT 시술 1례)

  • Bong Jeong Pyo;Kim Yoo Jung;Yang Jong Won;Kim Jin Hyung;Kim Tae Hwan;Choi Seong Jin
    • Korean Journal of Bronchoesophagology
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    • v.11 no.1
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    • pp.32-36
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    • 2005
  • This study aimed to report a case of infant who presented with a prenatal ultrasound diagnosis of agnathia, polyhydramnios followed by a review of previous studies. As widely acknowledge, agnathia is a complex lethal malformation characterized by absent mandible, microstomia, microglossia and ear anomaly which are secondary results to a defect of the first branchial auh. Newborn infants with agnathia often suffer from airway obstruction, causing fatal respiratory failure. The most difficult part of treating those newborns is to keep the airway patent. Therefore, as early airway management planning as possible is the most important part. Airway management was achieved with tracheotomy through an ex utero intrapartum treatment procedure(EXIT). The case of this infant, reporting here, was underwent tracheotomy with preservation of uteroplacental blood flow and gas exchange.

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Tricuspid Valve Endocarditis (삼첨판막 심내막염)

  • 문광덕;김대영
    • Journal of Chest Surgery
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    • v.29 no.4
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    • pp.440-443
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    • 1996
  • Some tricuspid valve endocarditis can be controlled effectively with specific antibiotic treatment. However, surgical intervention Is necessary when there are continuing sepsis, moderate or severe heart failure, multiple pulmonary emboli, and echocardiographycally demonstrated vegitations. We are repoting a 19 year-old male patient who was admitted for the treatment of infective endocarditis. He previously had an operation for ventriculer septal defect (perimembranous type) about 9 years ago . An echocardiogram showed a large vegetation on the anterior cusp area and a left to right shunt through VSD, which was previously closed with dacron patch. A valve replacement in addition to antibiotic therapy was recommended for the patient. The patient underwent on operation : tricuspid valve replacement was done with 51. Jude medical valve prosthesis (33 mm), and in addition to above procedure, removal of vegetation and direct closure of VSD were done Postoperative echocardiogram showed that replaced tricuspid valve functioned well and vegeta ion and shunt flow were not observed. The patient recovered without complication and discharged at Postoperative day 25. Early aggressive surgical intervention is indicated to optimize surgical results, and this case seems to be a typical right sided bacterial endocarditis, which is caused by residual VSD. We are reporting a case of tricuspid valve endocarditis with a review of the literature. (Korean J Thorax Cardiovasc Surg 1996 ; 29: 440-3)

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