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aging and sustainment issues with the general aviation fleet

Company Confidential. Today over 192,000 Cessna airplanes are flying in nearly every country of the world. Company Confidential. High Usage Airplanes. High Time Caravan

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aging and sustainment issues with the general aviation fleet

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    1. Company Confidential Aging and Sustainment Issues With the General Aviation Fleet

    2. Company Confidential

    3. Company Confidential

    4. Company Confidential Aging and Sustainment Issues Airframe Modifications Type Design Requirements Regulatory Requirements Education Summary

    5. Company Confidential Model 336/337

    6. Company Confidential Model 336/337

    7. Company Confidential Model 336/337

    8. Company Confidential Model 336/337

    9. Company Confidential Type Design Requirements Most general aviation airplanes are certified per CAR 3 requirements CAR 3 Criteria CAR §3.20(a) – Airplane Categories Normal Suffix N - “Airplanes in this category are intended for nonacrobatic, nonscheduled passenger and nonscheduled cargo operation” CAR §3.307 – Fatigue Strength “The structure shall be designed, insofar as practical, to avoid points of stress concentration where variable stresses above the fatigue limit are likely to occur in normal service.” Airframe designed and certified based on static strength Actual airplane usage may differ from original design intent Airplanes may be used in severe flight regimes Island hopping (15-20 minute flights) Pipeline patrol or ground survey (low altitude)

    10. Company Confidential Type Design Requirements FAR 23 requirements for fatigue evaluation added over time 23.571 Fuselage (1965) 23.572 Wing (1969) 23.572 Empennage (1987) Many airplanes certified in late 1960s and 1970s were “grandfathered” to CAR 3 requirements

    11. Company Confidential Type Design Requirements Today: Average age of general aviation fleet is 40+ years Majority of airframes are aluminum PSE components made from 7075-T6, 2014-T6 and other materials which are no longer used in new design Many older airplanes were not primed at the factory Airplanes used in corrosive environments (regions of South America, Africa, Australia, etc.)

    12. Company Confidential Regulatory Requirements Cessna’s continued airworthiness program (Supplemental Inspection Document or SID) is contained in airplane maintenance manual SID compliance varies by country Australia In January 2003 CASA required compliance with Cessna SID documents Europe EASA has required a continued airworthiness program since September 1, 2008 Cessna SID meets EASA requirement Several South American and African countries require compliance with the SID

    13. Company Confidential Regulatory Requirements SID compliance varies by country United States Compliance with SID depends…….. Engine (turbine or piston) Operation (Part 91 or Part 135) Defined maintenance program at time SID was introduced Continued airworthiness requirements for airplanes without a defined program

    14. Company Confidential Regulatory Requirements - Example Continued airworthiness requirements differ by country Model 208 – Chapter 4 Limit of Validity added to Chapter 4 for EASA For EASA certified airplanes, the Airworthiness Limitations section is applicable to airplanes with less than 50,000 flight hours…… SID requirements added to Chapter 4 for Ukraine registered airplanes For airplanes registered in the Ukraine, the supplemental inspections defined by the Listing of Supplemental Inspections (5-14-00) are mandatory…….

    15. Company Confidential Education Educate owners, operators and mechanics on physics fundamentals Metal fatigue NDI methods and limitations Corrosion Educational Opportunities Inspection Authorization (IA) Renewal Seminars Government sponsored discussions/seminars Newsletters Type clubs Report findings Example

    16. Company Confidential Summary Cessna’s philosophy is to do what is right for customer safety, including going beyond the regulatory requirements Updates to continued airworthiness programs are on-going Continued cooperation between OEMs, regulators and operators/maintainers is required to assure operational safety of the fleet

    17. Company Confidential

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