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Aircraft Availability

Aircraft Availability. EMIS 7370 Amber Trahan. All raw data was altered to protect Lockheed Martin Proprietary Information. Introduction. Improving aircraft availability is integral to the customer’s ability to successfully complete missions while lowering costs. Downtime Contributors:

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Aircraft Availability

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  1. Aircraft Availability EMIS 7370 Amber Trahan All raw data was altered to protect Lockheed Martin Proprietary Information

  2. Introduction • Improving aircraft availability is integral to the customer’s ability to successfully complete missions while lowering costs. • Downtime Contributors: • Failed components • Scheduled maintenance • Availability can be improved by: • Eliminating unnecessary maintenance tasks • Improving maintenance task time • Increase component reliability All raw data was altered to protect Lockheed Martin Proprietary Information

  3. Approach • Analyze failure records for two aircraft components. • Determine if components are performing as expected. • If not: • Determine leading cause of failures • Decided on possible solution • Calculate Cost-Benefit for proposed solution • Calculate possible aircraft availability improvement All raw data was altered to protect Lockheed Martin Proprietary Information

  4. Aircraft Availability Inherent Availability (Ai)determined from failure rates and corrective maintenance times only. Goal: Decrease margin between Inherent Availability and Operating Availability. Operational Availability (Ao)determined from time between maintenance actions, scheduled and corrective maintenance times and all associated logistics and administrative delays. All raw data was altered to protect Lockheed Martin Proprietary Information

  5. Mean Time Between Failure Field MTBF Predicted MTBF Based on guidelines in MIL-HDBK-217 Weighted average over multiple temperatures -40°C (2%) -20°C (5%) 25°C (80%) 40°C (6%) 55°C (5%) 71°C (2%) • Failure data collected from field • # failures • Flight hours • Corrective actions • MTBF = flight hours divided by number of failures All raw data was altered to protect Lockheed Martin Proprietary Information

  6. Cost-Benefit Analysis • Tool used in business to make economic decisions. • Compares the cost of accomplishing a project to the benefit gained once that project is complete. • Can be used to help choose between multiple options for a project. All raw data was altered to protect Lockheed Martin Proprietary Information

  7. Component A All raw data was altered to protect Lockheed Martin Proprietary Information

  8. Component A H0: µ ≥ 1800 H1: µ < 1800 -t0.05,23 = -2.807 Since t > -t0.05,23 the MTBF of Component A is indicated to be at least 1,800 flight hours. All raw data was altered to protect Lockheed Martin Proprietary Information

  9. Component B All raw data was altered to protect Lockheed Martin Proprietary Information

  10. Component B H0: µ ≥ 1250 H1: µ < 1250 t0.05,23 = 2.807 Since t < -t0.05,23 the MTBF of Component B is indicated to be less than 1,250 flight hours. All raw data was altered to protect Lockheed Martin Proprietary Information

  11. Component B All raw data was altered to protect Lockheed Martin Proprietary Information

  12. Proposed Solution • Switch backlighting from bulbs to LEDs • LEDs have a higher reliability • Less failures = less downtime All raw data was altered to protect Lockheed Martin Proprietary Information

  13. Cost-Benefit Analysis All raw data was altered to protect Lockheed Martin Proprietary Information

  14. Availability Savings The availability savings after implanting the LED solution is indicated to be 0.13%. This is a significant predicted increase in aircraft availability. All raw data was altered to protect Lockheed Martin Proprietary Information

  15. Summary • Component A achieving predicted MTBF • Component B not achieving predicted MTBF • Determined most frequent cause of failure was lamp failures • Proposed switching to LED backlighting • Decrease lamp failures by 80% • Cost-Benefit Analysis showed return 6 years after implementation • Aircraft availability savings estimated to be 0.13% All raw data was altered to protect Lockheed Martin Proprietary Information

  16. Conclusion • Analyzing failure data for a component on the aircraft and implementing a cost effective solution can bring the operating availability of an aircraft closer to the inherent availability. • Availability savings allows the customer to discern which improvements to implement, saving them time and money. All raw data was altered to protect Lockheed Martin Proprietary Information

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