A REPORT OF THE AIRWORTHINESS ASSURANCE WORKING GROUP RECOMMENDATIONS CONCERNING ARAC TASKING FR Doc. 04-10816 RE: AGING AIRPLANE SAFETY FINAL RULE 14 CFR 121.370a AND 129.16 TASK 3 FINAL REPORT A REPORT OF THE AIRWORTHINESS ASSURANCE WORKING GROUP RECOMMENDATIONS CONCERNING ARAC TASKING FR Doc. 04-10816 RE: AGING AIRPLANE SAFETY FINAL RULE 14 CFR 121.370a AND 129.16 TASK 3 FINAL REPORT FINAL REPORT March 22, 2007 Rev A April 11, 2007 SIGNED BY Rao Varanasi Mark Yerger Co-Chairperson, AAWG Co-Chairperson, AAWG Boeing Commercial Airplanes Federal Express March 22, 2007 Page 1 A REPORT OF THE AIRWORTHINESS ASSURANCE WORKING GROUP RECOMMENDATIONS CONCERNING ARAC TASKING FR Doc. 04-10816 RE: AGING AIRPLANE SAFETY FINAL RULE 14 CFR 121.370a AND 129.16 TASK 3 FINAL REPORT REVISION PAGE LTR DATE CHANGE PAGES PAGES PAGES APPROVED ADDED DELETED CHANGED BY A 11 Apr Page 9, Paragraph A2, Change 9, 11 AWH 07 the word “need” to “should”. Page 11, Repair Recommendation No. 3, Change the phrase “…recommends that repairs for WFD be addressed on a …..” to “….recommends that published repairs be addressed for WFD on a…..” March 22, 2007 Page 2 A REPORT OF THE AIRWORTHINESS ASSURANCE WORKING GROUP RECOMMENDATIONS CONCERNING ARAC TASKING FR Doc. 04-10816 RE: AGING AIRPLANE SAFETY FINAL RULE 14 CFR 121.370a AND 129.16 TASK 3 FINAL REPORT Table of Contents REVISION PAGE..................................................................................................2 Table of Contents..................................................................................................3 List of Figures .......................................................................................................5 List of Tables ........................................................................................................6 List of Abbreviations..............................................................................................7 Executive Summary..............................................................................................8 Conclusions.......................................................................................................9 A. ARAC Tasking.........................................................................................9 B. Baseline Structure ....................................................................................9 C. Repairs...................................................................................................10 D. Alterations ..............................................................................................10 Recommendations ..........................................................................................10 A. ARAC Tasking........................................................................................10 B. Baseline Structure......................................................................................10 C. Repairs...................................................................................................11 D. Alterations ..............................................................................................12 1. Introduction ....................................................................................................13 A. New Tasking ...............................................................................................13 B. Airworthiness Assurance Working Group ...................................................13 2. Task 3 – WFD Considerations for Baseline Structure and RAMs ..................15 A. Tasking Statement .....................................................................................15 B. Introduction To Task 3 ...............................................................................15 C. Summary of AAWG Position on Repairs and Alterations...........................15 1) Repairs ...................................................................................................15 2) Alterations...............................................................................................15 D. AAWG Understanding of FAA Position on WFD........................................16 1) WFD NPRM............................................................................................16 2) Repairs ...................................................................................................16 3) Alterations...............................................................................................16 4) Future Action On RAMs..........................................................................17 5) The FAA ARAC Tasking.........................................................................17 E. Harmonization............................................................................................17 1) Potential Impact to the Industry if EASA Deviates From FAA Approach 17 2) AAWG Recommendations Concerning Harmonization ...........................18 F. AAWG Previous Recommendations RE: WFD ..........................................18 1) Previous ARAC Recommendations regarding WFD to Baseline Structure .....................................................................................................................18 2) Discussion of Previous Recommendations.............................................18 G. AAWG Discussion and Recommendations for Baseline Structure ............19 1) 2007 ARAC Recommendations regarding WFD to Baseline Structure ..19 2) AAWG Recommended Changes for Guidance Material For Baseline Structure ......................................................................................................19 H. AAWG Discussion and Recommendations – Repairs and Alterations.......30 March 22, 2007 Page 3 A REPORT OF THE AIRWORTHINESS ASSURANCE WORKING GROUP RECOMMENDATIONS CONCERNING ARAC TASKING FR Doc. 04-10816 RE: AGING AIRPLANE SAFETY FINAL RULE 14 CFR 121.370a AND 129.16 TASK 3 FINAL REPORT 1) Introduction.............................................................................................30 2) AAWG Position on Repairs.....................................................................30 3) AAWG Position on Alterations................................................................32 I. AAWG Position on Means and Methods for RAMs .....................................33 1) WFD Analysis Methodology for Repairs and Alterations ........................34 2) Need For And Scope Of Testing Required To Support WFD Evaluations Of New Repairs And Alterations ..................................................................34 3) Screening of RAMs for Susceptibility to WFD.........................................35 4) Approval Process For New Repairs And Alterations. ..............................38 5) Assessing Need To Evaluate Existing Repairs And Alterations...............39 6) Where Recommended Guidance For RAMs Should Reside. ..................39 J. Consequences Of Other Approaches For RAMs - Potential Impact of FAA Approach to the Industry .................................................................................39 K. STG Activities ............................................................................................40 Appendix A: List of References..........................................................................44 A. REGULATIONS. .........................................................................................44 B. DOCUMENTS............................................................................................45 Appendix B: Copy of FAA Tasking Notice..........................................................48 Appendix C: Draft AC 120-WFD ........................................................................54 Appendix D: Simplified WFD Methodology ......................................................102 Appendix E: Screening of Repairs ...................................................................109 Appendix F: Design Service Goal ....................................................................110 Appendix G: Existing STC Modifications..........................................................112 Appendix H: AAWG Meetings and Attendance Records..................................143 March 22, 2007 Page 4 A REPORT OF THE AIRWORTHINESS ASSURANCE WORKING GROUP RECOMMENDATIONS CONCERNING ARAC TASKING FR Doc. 04-10816 RE: AGING AIRPLANE SAFETY FINAL RULE 14 CFR 121.370a AND 129.16 TASK 3 FINAL REPORT List of Figures FIGURE 2.G.1 TIMELINE FOR WFD ACTION – HIGH-TIME AIRPLANE LESS THAN DSG ON RULE EFFECTIVE DATE..................................................28 FIGURE 2.H.1 – TIMING OF TCH COMPLIANCE DATA SUBMITTAL TO FAA .....................................................................................................................31 FIGURE 2.I.1 – WFD SCREENING FOR REPAIRS...........................................36 FIGURE D.1 EVENTS LEADING TO WFD .....................................................108 FIGURE F.1 SCATTER PLOT OF TYPICAL AIRPLANE FLEET, NOVEMBER 2006...........................................................................................................110 FIGURE F.2 – DSG CHART OF A TYPICAL AIRPLANE................................111 March 22, 2007 Page 5 A REPORT OF THE AIRWORTHINESS ASSURANCE WORKING GROUP RECOMMENDATIONS CONCERNING ARAC TASKING FR Doc. 04-10816 RE: AGING AIRPLANE SAFETY FINAL RULE 14 CFR 121.370a AND 129.16 TASK 3 FINAL REPORT List of Tables TABLE 2.I.1 – SIGNIFICANT STCS...................................................................38 TABLE 2.K.1 – TYPE CERTIFICATE