Mac2601 may jun 2013 memo 10

Under certain circumstances, however, the following existing 36 CFR regulations may also apply. These existing authorities should be used carefully to ensure that all elements of the cited offense are present.

Mac2601 may jun 2013 memo 10

No thermal or vibration analyses or FEA are conducted. Design may be modeled. Boundary conditions are determined from higher-level models or measured data. Vibration response may not be measured in multiple locations or in all appropriate axes.

Limited FEA may be carried out. Some thermal or vibration objectives will not be met. Design is modeled for thermal and vibration characteristics. Special items and operating conditions are modeled.

Vibration response is measured in multiple locations in all appropriate axes. FEA is performed on structure. All thermal and vibration objectives should be met. The AMSAA Reliability Scorecard can be used for systems composed primarily of hardware, as well as those composed of both hardware and software.

Both Scorecards allow for identification of risks associated with achieving the reliability requirement, and they highlight critical activities that a program should execute to increase the likelihood of reliability success.

Continuing with the notional AoA, the second technique is executed to identify the risks associated with achieving the reliability requirement and the cost and schedule impacts associated with mitigating those risks. According to the completed Scorecard assessment, the program has an overall risk rating of 56, which is in the medium-risk range.

Based on knowledge from previous defense acquisition programs, it is estimated that this program would need to dedicate roughly 18 months to effectively execute these DfR efforts and incorporate the necessary design changes into the proposed system prior to entering formal, system-level reliability growth testing.

Therefore, if program management decides to push forward with the current design, the AMSAA Reliability Scorecard indicates that the technical risks associated with achieving the reliability requirement are medium. However, if program management is willing to make a strong commitment to executing the appropriate DfR best-practices and is willing to incur an month schedule delay, then the technical risks could be mitigated.

Reliability Growth Planning Curve Reliability growth planning addresses program schedules, amount of testing, resources available, and the realism of achieving and demonstrating the reliability requirement.

To plan for and manage reliability growth, programs develop a Reliability Growth Planning Curve RGPC and establish the necessary supporting activities. PM2 is an Excel-based mathematical model used to formulate a detailed reliability growth plan for a complex system under development.

Mac2601 may jun 2013 memo 10

If an RGPC using PM2 has not already been developed for the system, one should be developed using realistic planning parameters. The matrix includes 10 elements relating to the RGPC, with low- medium- and high-risk criteria associated with each element.

If several elements receive medium- or high-risk ratings, it may be unlikely for the system to achieve the reliability goals established by the RGPC. In such cases, a new, more achievable RGPC should be developed so most of the elements in the risk matrix yield low-risk ratings.

However, lower-level component testing and reliability block diagram estimates indicate that the system may only have an initial MTBF of 30 hours, which is significantly shorter than the planned value of hours.

Revenue and Economic Forecasts

To accomplish this, program management must be dedicated to conducting a major DfR effort that includes substantial redesign of one or more subsystems in order to mitigate large classes of failure modes. The hour MTBF requirement is appropriate for the system.

The developer did not dedicate the appropriate resources toward DfR activities, which would result in an month schedule delay were program management to perform those activities. For the program to have a low-risk plan, an initial MTBF of at least hours is needed.

Therefore, the month investment in the DfR activities identified by the Scorecard is essential. Poor reliability leads to higher sustainment costs for replacement spares, maintenance, repair parts, facilities, staff, etc. The model provides cost analyses by using existing consumable- and repairable-part input data that are tailored to a particular system.

As shown in the top row of Figure 4, if the proposed system had an MTBF requirement of only hours, no system-level reliability growth testing would be needed, as long as the system undergoes the 18 months of previously mentioned DfR activities.limpopo grade 12 question papers and FREE PDF DOWNLOAD NOW!!!

Mac2601 may jun 2013 memo 10

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