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Part 26 DAH Requirements for Fuel Tank Flammability

Part 26 DAH Requirements for Fuel Tank Flammability. Applicable Part 26 Sections. 26.5 Applicability table 26.31 Definitions 26.33 Holders of type certificates 26.35 Changes to type certificates affecting fuel tank flammability 26.37 Pending type certification projects

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Part 26 DAH Requirements for Fuel Tank Flammability

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  1. Part 26 DAH RequirementsforFuel Tank Flammability

  2. Applicable Part 26 Sections 26.5 Applicability table 26.31 Definitions 26.33 Holders of type certificates 26.35 Changes to type certificates affecting fuel tank flammability 26.37 Pending type certification projects 26.39 Newly produced airplanes

  3. § 26.31 Definitions • Flammability Exposure Evaluation Time (FEET) The time from the start of preparing the airplane for flight, through the flight and landing, until all payload is unloaded and all passengers and crew have disembarked. • Fleet Average Flammability Exposure The percentage of the FEET each fuel tank ullage is flammable for a fleet of an airplane type operating over the range of flight lengths in a world-wide range of environmental conditions and fuel properties as defined in part 25, Appendix N. • Normally Emptied Fuel Tank A fuel tank other than a Main Fuel Tank

  4. § 26.33 TC Holders • Applicability, § 26.33(a) • U.S. type certificated transport category, turbine-powered airplanes • Original certificate of airworthiness or export airworthiness approval issued on or after 1/92. • Airplanes with: • A maximum passenger capacity of 30 or more, or • A maximum payload capacity of 7,500 lbs or more. • Airplanes designed for all-cargo operations excluded

  5. § 26.33(a) Applicable Airplane Models NOTE:This list represents our best determination of applicable airplane models at this time. It is the DAH’s responsibly to identify all of their applicable airplane models.

  6. Compliance Timeline for TC Holders (§ 26.33) 90 days 60 days 60 days 60 days 15 months Rule Effective 12/26/08 Compliance plan for design change and service instructions 9/09 Compliance plan for flam. analysis 3/09 Flam. analysis completed 5/09 FRM/IMM service instructions, ICAs, ALS 12/26/10 Draft of compliance items 10/10 ALS - Airworthiness Limitations Sections FRM - Flammability Reduction Means IMM – Ignition Mitigation Means ICAs- Instructions for Continued Airworthiness

  7. § 26.33 Flammability Exposure Analysis (TC Holders) • Compliance plan • Must be submitted by 3/09 (90 days after rule effective date) • Must contain: • Proposed schedule for submitting analysis or determination that analysis is not required because design change will be developed • Proposed means of conducting analysis, if applicable. • Analysis • Must be submitted by 5/09 (150 days after rule effective date) • Must address all fuel tanks and changes that affect flammability exposure • Must be conducted in accordance with part 25, Appendix N

  8. § 26.33 Flammability Exposure Analysis (TC Holders) • Exception: Analysis is not required for… • Fuel tanks for which DAH notified FAA they will provide Flammability Reduction Means (FRM) or Ignition Mitigation Means (IMM) • Fuel tanks substantiated to be conventional unheated aluminum wing tanks

  9. If analysis shows tank is a high flammability tank*… • Design change (FRM or IMM) service instructions, ICAs, and airworthiness limitations are required • Compliance plan for design change must be submitted by 9/09 • Draft of all compliance items must be submitted by 10/10 (60 days before final data and documents are required) • Design change, service instructions, ICA and airworthiness limitations must be submitted 12/26/10 * Fleet Average Flammability Exposure exceeds 7%

  10. Performance Criteria for Flammability Reduction Means, § 26.33(c)(1) • Normally emptied fuel tanks with any portion in fuselage contour • Must meet flammability exposure criteria of part 25, Appendix M • Fleet Average Flam. Exposure may not exceed 3% • Warm day may not exceed 3% • Other tanks • Must meet flammability exposure criteria of part 25 Appendix M, except Fleet Average Flam. Exposure may not exceed 7%

  11. Critical Design Configuration Control Limitations (CDCCL) • DAHs who are required to make design changes must develop CDCCLs. • CDCCLs must be developed to: • Prevent increasing flammability exposure of tanks with FRMs. • Prevent degradation of IMM performance.

  12. CDCCL Examples • Limits on heat input such as adding blankets or additional hydraulic heat exchangers • Limits on how an auxiliary fuel tank is integrated with an existing fuel tank system • Limiting venting into a tank with an FRM based on inerting • Limiting the transfer of warm fuel from the auxiliary tank • Limits on use of high volatility fuels such as JP-4 • Limits on systems such as minimum quantity of engine bleed air flow or electricity that is required to supply power to an FRM.

  13. If analysis shows tank is NOT a high flammability tank*… • Airworthiness limitations section (ALS) of maintenance manual or ICA must be submitted by 12/26/10 • ALS must contain CDCCL, inspections, or other procedures developed under § 26.33(e) * Fleet Average Flammability Exposure exceeds 7%

  14. Compliance Plans • Specific items that must be included in compliance plan are listed in the rule • Compliance plans must be submitted to the FAA Oversight Office • Foreign manufactures should submit documents to FAA through their civil aviation authority • Civil aviation authority may recommend approval • Approval is retained by FAA – approval is not delegated

  15. What is the “FAA Oversight Office”? • The aircraft certification office (ACO) or office of the Transport Airplane Directorate with oversight responsibility for the relevant TC or STC • Defined in § 26.3 • TC examples: • Boeing (Puget Sound) - Seattle ACO • Boeing (Long Beach) – Los Angeles ACO • Airbus - Transport Standards Staff • Bombardier - New York ACO • Embraer – Transport Standards Staff FAA

  16. FAA Review of Compliance Plans • FAA will complete review of plan within 4 weeks • If plan is acceptable, FAA will inform DAH via approval letter within 6 weeks of receipt of proposed plan • If plan is unacceptable, FAA will • immediately contact DAH • identify deficiencies • notify DAH of deficiencies by letter within 6 weeks of receipt of proposed plan • work with DAH expeditiously to identify mutually acceptable corrections Ref. Order 8110.104

  17. FAA Review of Revised Compliance Plan • If revised plan is acceptable, FAA will inform DAH via approval letter within 3 weeks of receipt of revised plan • If no acceptable compliance plan is submitted, FAA may pursue enforcement action

  18. FAA Review of Draft Compliance Data • FAA will review draft data, and notify DAH within 5 weeks of receipt of data if the data is acceptable or not acceptable • If data is not acceptable, the FAA will work with DAH to identify mutually acceptable solutions to correct deficiencies

  19. FAA Review of Final Compliance Data • FAA will review final data, and if acceptable, notify DAH within 6 weeks of receipt of data • If not acceptable, FAA will – • Identify and notify DAH of deficiencies within 5 weeks of receipt of final data • Work with DAH to identify mutually acceptable solutions to correct deficiencies • FAA will review revised data, and approve, if acceptable within 3 weeks of receipt • If no data is submitted or if there is no acceptable resolution of issues to support compliance, FAA may initiate enforcement actions

  20. Foreign DAH Communications • All compliance plans and compliance data are submitted through the foreign civil aviation authority oversight office to the FAA

  21. § 26.35 Changes to type certificates • Applicability, § 26.35(a) • Section 26.35 applies to the following design changes on airplanes subject to § 26.33(a): See slide 5 for applicable airplane models. * As of 9/19/08 **Applications made on or after 9/19/08

  22. ALS - Airworthiness Limitations Sections FRM - Flammability Reduction Means IMM – Ignition Mitigation Means FIMM – Flammability Impact Mitigation Means Compliance Timeline for TC Holders (§ 26.33) 60 days 90 days 60 days 15 months 60 days Rule effective 12/26/08 Compliance plan for design change and service instructions 7/09 Compliance plan for flam. analysis 3/09 Flam. analysis completed 5/09 FRM/IMM service instructions, ICAs, ALS 12/26/10 Draft of compliance items 10/10 Compliance Timeline for Holders and Applicants of Changes to Certificates (§ 26.35) 14 months 60 days 4 months 2 months 90 days 9 months 14 months Compliance plan for flam. analysis 3/09 Rule effective 12/26/08 FIMM plan 8/11 Impact assessment 5/11 FIMM draft items 7/21/12 Flam. analysis completed 12/09 Impact assessment plan 2/11 Final FIMM items 9/19/12

  23. § 26.35 Flammability Exposure Analysis • All DAHs and applicants identified on earlier slide, which lists § 26.35 applicability, must conduct analysis • Exceptions • Fuel tanks for which DAH/applicant notified FAA it will provide design change and service instructions for an IMM • Fuel tanks substantiated to be conventional unheated aluminum wing tanks. • Compliance plan • Existing STC and field approval holders must submit by 3/09 • Current and future applicants provide as part of their certification project • Analysis must be conducted in accordance with part 25, Appendix N

  24. § 26.35 Impact Assessment • Must be conducted by: • Existing holders of STCs and field approvals for Normally Emptied fuel tank installations on: • Boeing 737, 747, 757, 767, 777 • Airbus A300, A310, A318, A319, A320, A321, A330, A340 • Future STC/ATC applicants for changes that may increase the flammability exposure of a tank for which FRM or IMM is required • Must identify any features that compromise previously defined CDCCLs

  25. § 26.35 Impact Assessment • Compliance dates for holders of STCs and field approvals • Impact assessment plan: 2/11 • Impact assessment: 5/11 • Compliance dates for future STC/ATC applicants • Impact assessment plan: Part 26 does not specify compliance date. • Impact assessment: 5/11 or before certificate is issued • Documents must be submitted to FAA Oversight Office for approval • May not be delegated

  26. § 26.35 Design Changes and Service Instructions

  27. § 26.37 Pending TC projects • Pending TC projects* must include § 25.981, effective 12/26/08 in certification basis. • Applicable airplanes would have • a maximum passenger capacity of 30 or more, or • a maximum payload capacity of 7,500 lbs. or more. • Example airplanes • Airbus A350 • Alenia C-27J • Boeing 787 • Commercial Aircraft Corporation of China ARJ21 * Application made before 12/26/08, but TC not issued by that date.

  28. § 26.39 Newly produced airplanes • Applicable airplanes • Boeing model 737, 747, 767 and 777 • Passenger and cargo versions of models • Application for original certificate of airworthiness or export airworthiness approvals made after 9/20/10. Note: Although Airbus is not required to comply with this section, the operating rules require any newly produced Boeing or Airbus airplanes put into service after December 26, 2010 to meet the same flammability requirements.

  29. § 26.39 Newly produced airplanes • Fuel tanks meeting all of the following criteria must have an FRM or IMM meeting § 25.981, effective 9/19/08 • Fuel tank is Normally Emptied • Any portion of tank is within fuselage contour • Tank exceeds Fleet Average Flam. Exposure of 7% • All other tanks that exceed Fleet Average Flammability Exposure of 7% must have: • IMM that meets § 25.981(d), or • FRM that meet Appendix M, except the Fleet Average Flammability Exposure may not exceed 7%

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