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Remote Control (RC) Fails to Transmit RC POWER Button Inoperable RC Battery Failed
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Figure 50.11 Remote Control TV-FTA Feature Example
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EXAMPLE 50.5
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Failures in gyroscopes and accelerometers in ight control systems for aircraft and sensors can result in major accuracy, safety, and political risks. Therefore, these components may be designated as RCIs.
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RCI solutions include singling out these components, specifying higher reliability components, or implementing redundancy with LESS reliability components. Redundancy, however, compounds the system reliability and increases expense and maintenance because of increased parts counts. Some systems require special considerations such as electrostatic discharge (ESD) during manufacture and testing to preclude premature failures due to poor procedures. Additionally, systems that go into storage for extended periods of time prior to usage may have components with a limited shelf life. Therefore, factor ESD and shelf life considerations into reliability estimates and design requirements. Perform an Electronic Parts/Circuits Tolerance Analysis. Some systems may require investigation using tolerance analysis sometimes referred to as worst-case analysis. Electronic parts/circuits components are derated and assigned their maximum tolerance values that will have maximum effect on circuit output. The system is then evaluated to assure that it can still function under these extreme conditions. The analysis is then evaluated again at the other extreme end of the maximum tolerance values to assure that the system can still function. Since most of today s products are digital and have high reliabilities, the marginal utility of this analysis should be assessed on a program needs basis. Eliminate Single-Point Failures in Mission Critical Items. Since failures in mission critical items can force an aborted mission, SEs and R&Ms often specify higher levels of reliability that drive up system costs. Yet, they ignore interfaces to the item that are also single points of failure
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50.7 Applying RAM to System Design
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(SPFs) and may have a higher probability of failure. When searching for SPFs, investigate not only at the component reliability but also its interface implementation reliability. Improve System Reliability through Redundancy. Mission critical systems often have stringent reliability requirements that are very expensive to achieve. Additionally, the possibility of a SPF may be too risky from a safety point of view. One approach to developing solutions to these types of challenges is through system design redundancy. In some cases elements with lesser reliabilities and costs can be combined to achieve higher performance reliability requirements but at the expense of increased parts counts and maintenance. Author s Note 50.6 Customers and speci cations often mandate redundancy, without determining if there is a compelling need. Remember, redundancy is a design method option exercised to achieve a system reliability requirement or to eliminate a single point of failure of a mission critical item. Avoid specifying redundancy, which drives up costs, without rst determining IF the current design solution is insuf cient to meet the reliability requirements. Architectural Redundancy versus Component Redundancy. SEs sometimes convince themselves they have designed in system redundancy by simply adding redundant components. This may be a false perception. There is a difference between creating redundant components and design implementation redundancy. To see this, refer to Figure 50.12. In the gure, we have a simple system that includes Item 1 and Item 1 Backup. Panel A shows the design implementation redundancy in signal ow by way of separate, independent interfaces to Item 1 and Item 1 Backup from a single input stimulus or excitation. The same is true with the output interface. Architecturally, if either interface fails and both Item 1 and Item 1 Backup are working properly, an output response is produced. Thus, we can avoid a single point of failure (SPF). In contrast, Panel B includes redundant elements Item 1 and Item 1 Backup. Here, there is a SINGLE interface entry to Item 1 and Item 1 Backup. Therefore, the interface becomes a single
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