Author: J. de S. Coutinho
Publisher:
ISBN:
Category : Acceptance test
Languages : en
Pages : 33
Book Description
The considerations and procedures which shape the contractual arrangements for the procurement of reliable aerospace systems are discussed. Such systems are usually procured from single sources of supply on a relatively rigid schedule, and they consist of high-cost, low-production, long-lead-time items. Furthermore, cost of maintenance over equipment lifetime may exceed the initial cost by a large factor; hence, logistics considerations also exert a strong influence. In these special circumstances, normal commercial procurement procedures are unsuitable for providing a customer with the protection inherent in the competitive market place, and he must resort to policing his supplier's activities, which at best is never a completely adequate procedure. The contract must provide for a program plan which establishes specific scheduled monitoring points during the development and fabrication stages, such as review of design requirements and environments, design arrangements, proof-of-design by analysis, qualification test plans and execution, and acceptance test procedures. In the execution of this plan the customer assumes the risk that a product which passes the qualification test will be satisfactory in service. The supplier assumes the risk that he can design and fabricate a product which will pass the qualification test. Qualification test results should therefore correlate both with analytical design methods and with data fed back from actual field operations. The proper design of qualification test procedures depends on an understanding of the basic causes of unreliability, such as our inability to predict correctly the actual operating environments, and the unit-to-unit variation in component resistance to failure. Our inability to specify correctly the environmental requirements is due in part to the inadequacy of available empirical data; to new and previously unknown environments encountered as the operating range is extended; and to the invention by the operators of new uses for the system. The considerations which enter into the design of qualification test spectra are discussed in detail, and some spectra in current use are analyzed. The unit-to-unit variation of components may be minimized by reliability control of the design of the manufacturing processes, and may be measured in a series of tests-to-failure. Although it is difficult to establish accept-reject criteria, an approach is described which is believed to have merit.
Contractual Reliability Acceptance Procedures
Author: J. de S. Coutinho
Publisher:
ISBN:
Category : Acceptance test
Languages : en
Pages : 33
Book Description
The considerations and procedures which shape the contractual arrangements for the procurement of reliable aerospace systems are discussed. Such systems are usually procured from single sources of supply on a relatively rigid schedule, and they consist of high-cost, low-production, long-lead-time items. Furthermore, cost of maintenance over equipment lifetime may exceed the initial cost by a large factor; hence, logistics considerations also exert a strong influence. In these special circumstances, normal commercial procurement procedures are unsuitable for providing a customer with the protection inherent in the competitive market place, and he must resort to policing his supplier's activities, which at best is never a completely adequate procedure. The contract must provide for a program plan which establishes specific scheduled monitoring points during the development and fabrication stages, such as review of design requirements and environments, design arrangements, proof-of-design by analysis, qualification test plans and execution, and acceptance test procedures. In the execution of this plan the customer assumes the risk that a product which passes the qualification test will be satisfactory in service. The supplier assumes the risk that he can design and fabricate a product which will pass the qualification test. Qualification test results should therefore correlate both with analytical design methods and with data fed back from actual field operations. The proper design of qualification test procedures depends on an understanding of the basic causes of unreliability, such as our inability to predict correctly the actual operating environments, and the unit-to-unit variation in component resistance to failure. Our inability to specify correctly the environmental requirements is due in part to the inadequacy of available empirical data; to new and previously unknown environments encountered as the operating range is extended; and to the invention by the operators of new uses for the system. The considerations which enter into the design of qualification test spectra are discussed in detail, and some spectra in current use are analyzed. The unit-to-unit variation of components may be minimized by reliability control of the design of the manufacturing processes, and may be measured in a series of tests-to-failure. Although it is difficult to establish accept-reject criteria, an approach is described which is believed to have merit.
Publisher:
ISBN:
Category : Acceptance test
Languages : en
Pages : 33
Book Description
The considerations and procedures which shape the contractual arrangements for the procurement of reliable aerospace systems are discussed. Such systems are usually procured from single sources of supply on a relatively rigid schedule, and they consist of high-cost, low-production, long-lead-time items. Furthermore, cost of maintenance over equipment lifetime may exceed the initial cost by a large factor; hence, logistics considerations also exert a strong influence. In these special circumstances, normal commercial procurement procedures are unsuitable for providing a customer with the protection inherent in the competitive market place, and he must resort to policing his supplier's activities, which at best is never a completely adequate procedure. The contract must provide for a program plan which establishes specific scheduled monitoring points during the development and fabrication stages, such as review of design requirements and environments, design arrangements, proof-of-design by analysis, qualification test plans and execution, and acceptance test procedures. In the execution of this plan the customer assumes the risk that a product which passes the qualification test will be satisfactory in service. The supplier assumes the risk that he can design and fabricate a product which will pass the qualification test. Qualification test results should therefore correlate both with analytical design methods and with data fed back from actual field operations. The proper design of qualification test procedures depends on an understanding of the basic causes of unreliability, such as our inability to predict correctly the actual operating environments, and the unit-to-unit variation in component resistance to failure. Our inability to specify correctly the environmental requirements is due in part to the inadequacy of available empirical data; to new and previously unknown environments encountered as the operating range is extended; and to the invention by the operators of new uses for the system. The considerations which enter into the design of qualification test spectra are discussed in detail, and some spectra in current use are analyzed. The unit-to-unit variation of components may be minimized by reliability control of the design of the manufacturing processes, and may be measured in a series of tests-to-failure. Although it is difficult to establish accept-reject criteria, an approach is described which is believed to have merit.
Military Standard
Author: United States. Department of Defense
Publisher:
ISBN:
Category : Reliability (Engineering)
Languages : en
Pages : 154
Book Description
Publisher:
ISBN:
Category : Reliability (Engineering)
Languages : en
Pages : 154
Book Description
Airworthiness Inspector's Handbook, 8300.10 Changes 1- 5, November 1, 1998
Social Security Administration's Management of Data Communications Contracts with Paradyne Corp
Author: United States. Congress. House. Committee on Government Operations. Legislation and National Security Subcommittee
Publisher:
ISBN:
Category : Computer contracts
Languages : en
Pages : 564
Book Description
Publisher:
ISBN:
Category : Computer contracts
Languages : en
Pages : 564
Book Description
Reliability Abstracts and Technical Reviews
Author:
Publisher:
ISBN:
Category : Reliability (Engineering)
Languages : en
Pages : 704
Book Description
Publisher:
ISBN:
Category : Reliability (Engineering)
Languages : en
Pages : 704
Book Description
Reliability Growth
Author: Panel on Reliability Growth Methods for Defense Systems
Publisher: National Academy Press
ISBN: 9780309314749
Category : Technology & Engineering
Languages : en
Pages : 235
Book Description
A high percentage of defense systems fail to meet their reliability requirements. This is a serious problem for the U.S. Department of Defense (DOD), as well as the nation. Those systems are not only less likely to successfully carry out their intended missions, but they also could endanger the lives of the operators. Furthermore, reliability failures discovered after deployment can result in costly and strategic delays and the need for expensive redesign, which often limits the tactical situations in which the system can be used. Finally, systems that fail to meet their reliability requirements are much more likely to need additional scheduled and unscheduled maintenance and to need more spare parts and possibly replacement systems, all of which can substantially increase the life-cycle costs of a system. Beginning in 2008, DOD undertook a concerted effort to raise the priority of reliability through greater use of design for reliability techniques, reliability growth testing, and formal reliability growth modeling, by both the contractors and DOD units. To this end, handbooks, guidances, and formal memoranda were revised or newly issued to reduce the frequency of reliability deficiencies for defense systems in operational testing and the effects of those deficiencies. "Reliability Growth" evaluates these recent changes and, more generally, assesses how current DOD principles and practices could be modified to increase the likelihood that defense systems will satisfy their reliability requirements. This report examines changes to the reliability requirements for proposed systems; defines modern design and testing for reliability; discusses the contractor's role in reliability testing; and summarizes the current state of formal reliability growth modeling. The recommendations of "Reliability Growth" will improve the reliability of defense systems and protect the health of the valuable personnel who operate them.
Publisher: National Academy Press
ISBN: 9780309314749
Category : Technology & Engineering
Languages : en
Pages : 235
Book Description
A high percentage of defense systems fail to meet their reliability requirements. This is a serious problem for the U.S. Department of Defense (DOD), as well as the nation. Those systems are not only less likely to successfully carry out their intended missions, but they also could endanger the lives of the operators. Furthermore, reliability failures discovered after deployment can result in costly and strategic delays and the need for expensive redesign, which often limits the tactical situations in which the system can be used. Finally, systems that fail to meet their reliability requirements are much more likely to need additional scheduled and unscheduled maintenance and to need more spare parts and possibly replacement systems, all of which can substantially increase the life-cycle costs of a system. Beginning in 2008, DOD undertook a concerted effort to raise the priority of reliability through greater use of design for reliability techniques, reliability growth testing, and formal reliability growth modeling, by both the contractors and DOD units. To this end, handbooks, guidances, and formal memoranda were revised or newly issued to reduce the frequency of reliability deficiencies for defense systems in operational testing and the effects of those deficiencies. "Reliability Growth" evaluates these recent changes and, more generally, assesses how current DOD principles and practices could be modified to increase the likelihood that defense systems will satisfy their reliability requirements. This report examines changes to the reliability requirements for proposed systems; defines modern design and testing for reliability; discusses the contractor's role in reliability testing; and summarizes the current state of formal reliability growth modeling. The recommendations of "Reliability Growth" will improve the reliability of defense systems and protect the health of the valuable personnel who operate them.
Reliability and Maintainability in Perspective
Author: David John Smith
Publisher: John Wiley & Sons
ISBN:
Category : Computers
Languages : en
Pages : 296
Book Description
Publisher: John Wiley & Sons
ISBN:
Category : Computers
Languages : en
Pages : 296
Book Description
Reliability Principles and Practices
Author: S. R. Calabro
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 392
Book Description
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 392
Book Description
Reliability Testing for Engineering Development, Qualification, and Production
Author: United States. Department of Defense
Publisher:
ISBN:
Category : Reliability (Engineering)
Languages : en
Pages : 66
Book Description
Publisher:
ISBN:
Category : Reliability (Engineering)
Languages : en
Pages : 66
Book Description
Reliability Abstracts and Technical Reviews
Author: United States. National Aeronautics and Space Administration. Office of Reliability and Quality Assurance
Publisher:
ISBN:
Category : Quality control
Languages : en
Pages : 610
Book Description
Publisher:
ISBN:
Category : Quality control
Languages : en
Pages : 610
Book Description