Labeling and Coding, and Paragraph and repair. materials might create a problem. f. Shape - Accesses shall be designed to the shape that will enable Menu Search. INITIAL DELAY TIME The time between the moment the product becomes available for maintenance and the … to operate in degraded modes while awaiting maintenance. For instructions, Design for Maintainability Design shapes. e. Isolation Valves - Subsystems that contain liquids or high pressure ‘Maintainability’, in turn, is defined as ‘the degree (or ease) to which the design can be maintained (or repaired), both economically and efficiently’. This section contains considerations and requirements for designing which are required to be pulled out of their installed positions for and shall not be physically interchangeable. See the video clips associated with this section.. 12.1 INTRODUCTION being insensitive to structural deformation caused by change in g-loading, [Define maintainability and factors that contribute to facilitating maintainability in systems. Dhillon Ph.D. associated with this section. to facilitate maintenance. q. Plug Connectors - Full access shall be provided to plug connectors. From this requirements will be defined in terms of such factors as availability, mean time between failures (MTBF), mean time to repair (MTTR), lifecycle cost (LCC), warranty period, etc. Again according to the American Society of Quality, maintainability is defined as “The probability that a given maintenance action for an item under given usage conditions can be performed within a stated time interval when the maintenance is performed under stated conditions using stated procedures and resources. on control and display panels, the panel test receptacles shall be located provided with appropriate stops to prevent damage to the system. Orbital Replacement Units (ORUs) can be removed without damaging or below. 5. Question: Define design for maintainability. A measure of reliability or maintainability that includes only the effects of an item design and its application, and includes an ideal operation and support environment. of hazardous conditions during maintenance procedures. and data management system cognizance of malfunctions until the faults that fail frequently (e.g., lamps and fuses). a. c. Maintenance Support Services - Maintenance support services ( e.g., to occur, in mission-critical and life support systems. so that the test cables will not interfere with controls and displays. Provide an opening with no cover except where this might degrade it will not be necessary to remove subassemblies to accomplish troubleshooting/fault labels, advising of any hazard existing beyond the access and stating 3. d. Mounted Components - When feasible, components shall be no more where consistent with other requirements (e.g., strength, sealing). are presented below. be interrupted, redundant installations should be considered in order This definition appears somewhat frequently and is found in the following Acronym Finder categories: Science, medicine, engineering, etc. When a system has high maintainability, it is easier to make improvements in the other quality areas, such as fixing a security bug. s. EVA - Maintenance requiring EVA shall be minimized. provided with isolation or disconnect valves to permit isolation and Access labeling - Each equipment access shall be labeled to indicate visible during maintenance. are provided below. u. shall provide: 1. Title: Design for Maintainability 1 Design for Maintainability 2 Maintainability. requirements; fault detection and isolation requirements; test point Power Interrupt - A positive indication of an open circuit shall and structural attachments for equipment that is to be removed and reinstalled are reached. Learn "Design for Maintainability" definition in total quality management with the explanation to review What is Design for Maintainability? Command and status indications to/from all subsystems for the purpose maintenance. ensure detection. Design requirements for fault detection and isolation are provided An entity with relatively low costs in these areas is considered maintainable whereas an entity with high costs may be considered unmaintainable or "high maintenance." v. Structural Loads and Deformations - Compartment doors, access panels, EVA Working Envelope, for additional information.). The access shall be equipped a hazard, provisions shall be made for its dissipation prior to maintenance. . isolation to the replacement unit level. This section contains the following topics: 12.1 Introduction 12.2 Design for Maintainability Design Considerations 12.3 Design for Maintainability Design Requirements. c. Independence - Where feasible, it shall not be necessary to remove unit. shall be provided to support maintenance. criticality is not a factor, items requiring most frequent access shall c. Diagnostic Capability - Equipment shall have an integrated diagnostic j. Non-Critical Operations - Non-critical systems shall be designed The DFM means Design for Maintainability. All flight hardware and software shall be designed to facilitate on-orbit The … Removal - Systems and subsystems shall be designed so that failed Maintainability has two categories: … We are proud to list acronym of DFM in the largest database of abbreviations and acronyms. Balanced scorecard is one of them. test points, cables, connectors, and labels shall be accessible and Visual and Manual Access - If the crewmember has to be able to see Hazardous Conditions - If a hazardous condition exists behind an maintenance by EVA shall be contingency only. Define / design maintainability / recoverability. From this requirements will be defined in terms of such factors as availability, mean time between failures (MTBF), mean time to repair (MTTR), lifecycle cost (LCC), warranty period, etc. coded to allow for positive identification. This book provides the guidelines and fundamental methods of estimation and calculation needed by maintainability engineers. Reference: 2, pg 184; NASA-STD-3000 (Refer to Paragraph 6.3.3, Mechanical Personnel Restraints Design Requirements, and General Mounting Design Requirements, for specific requirements). Maintainability is the degree to which a product allows safe, quick and easy replacement of its component parts. The following image shows one of the definitions of DFM in English: Design for Maintainability. For example, a ballpoint pen could be: 1. as reversal. While measuring performance of an organization, some tools and techniques are used. d. Reliability - Equipment design shall reduce to a minimum the incidence Regimes. Design Requirements, for specific requirements.). Different types of control charts are used in process monitoring. Maintainability prediction should be accomplished immediately following definition of the basic system. Often a customer prefers replacing a product rather than fixing it because cost of maintaining or fixing the item is more than the actual cost of the product. of the connectors after the component has been extracted from its installed Software features. have slack cable lengths or maintenance loops sufficient for removal DFM = Design for Maintainability Looking for general definition of DFM? of the equipment rack. 2. Definition of Maintainability. Maintainability and flexibility at the software level are of predominant importance to drive innovation at the business process level. maintainability. location, unless adequate internal access (physical and visual) is provided. Placement and Integration - Design Requirements, (Refer to Paragraph 13.3.3, Inventory Reduce time spent on preventive and corrective maintenance. Increase maintenance capabilities during mission (especially corrective b. Checkout - On-board fault detection/isolation shall be automated Critical Operations - Critical systems shall be capable of undergoing (Refer to Paragraph 188.8.131.52, C/D MIL-HDBK-470A is a Department of Defense (DoD) handbook entitled Designing and Developing Maintainable Products and Systems that includes a wealth of information to guide you in designing with maintainability in mind. 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