The National FAA Safety Team Presents

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Presented to: By: Date: Federal Aviation Administration Produced by: The FAA Safety Promotion Program Office Spring 2020 Chinh Vuong, AIR-6C1 IA Seminar Hazards of Layering Multiple STCs The National FAA Safety Team Presents Federal Aviation Administration • Exits • Restrooms • Emergency Evacuation • Breaks • Sponsor Acknowledgment • Other information Welcome 2 Federal Aviation Administration People always seem to have a better idea 3 Federal Aviation Administration •Image Special Mission…or not 4 Federal Aviation Administration For STCs that are NOT “one-only”, include the following note: “The installer must determine whether this design change is compatible with previously approved modifications.” FAA Form 8110-2 5 Federal Aviation Administration • Three NTSB Safety Recommendations Issued by the Board on May 24, 2012 • A-12-21 through A-12-23 Educate Evaluate Document 3 NTSB Safety Recommendations 6 Federal Aviation Administration AC 20-188 Compatibility of Changes to Type Design Installed on Aircraft 1. List of Installations that Might be Incompatible (Sec 4.2) 2. Guidance for the Owner/Operator (Sec 5) 3. Installer Responsibilities (Sec 6) 4. How to Resolve Non- compatible Modifications (Sec 7) 7 Federal Aviation Administration Beech Baron N28MR 2 Fatalities 8 •Image Federal Aviation Administration “…Might be Incompatible…” • Baron accident – “Throw-over” control yoke – Low altitude / low airspeed flight instruction – V mca – minimum control speed – Vortex generators to reduce V mca – Engine power & prop changed – Engine nose cowlings changed – Winglets installed – Interaction of wing and power changes 9 Federal Aviation Administration Overall View of Fuselage and Cockpit Damage Cessna 337 N12NA 5 Fatalities Outboard Section of the Left Wing Separated and found on the Runway 10 Federal Aviation Administration “…Might be Incompatible…” Skymaster accident • Interaction of – STOL kit • Leading edge cuffs • Stall fences – Wing extensions with fuel tanks – Winglets • Wing skin fatigue cracks • Outboard right wing separated in flight 11 Federal Aviation Administration Other Compatibility Guidance • Besides AC 20-188 “Compatibility of Changes to Type Design Installed on Aircraft”… 12 Federal Aviation Administration AC 43.9-1G, Instructions for Completion of FAA Form 337 • New Revision published on Nov. 1, 2019 • Adds 3rd purpose highlighting compatibility 13 Federal Aviation Administration FAA Form 337 NOTICE Weight and balance or operating limitation changes shall be entered in the appropriate aircraft record. An alteration must be compatible with all previous alterations to assure continued conformity with the applicable airworthiness requirements. •I m a g e 14 Federal Aviation Administration FAA Form 337, Item 8 • Clearly document how the installer determined compatibility and interaction between the new modification and previously installed modifications on the same aircraft • Item 8 should record the compatibility assessment to show that installation of the new modification (e.g., STC) will not create a safety issue or noncompliant condition when combined with existing modifications • AC 20-188, Section 4.2 provides examples of combinations of installations which may result in compatibility issues • AC 20-188 Section 6. outlines the Installers Responsibilities for assessing compatibility – When the compatibility assessment exceeds installer’s capability, installer should enlist engineering support (e.g. STC holder or appropriately rated DER) to assist in making the determination 15 Federal Aviation Administration Other Related Documents • Anchorage ACO flyer, How Do I Determine Supplemental Type Certificate (STC) Compatibility? • Aircraft Owners and Pilots Association (AOPA) article “Layering STCs: Understanding and Managing the Risks. November 21, 2013 • FAA Safety Briefing - May/June 2014 article Beware the Frankenplane! The Hidden Dangers of Layering STCs 16 Federal Aviation Administration Transport Canada Transport Canada Airworthiness Notices - B045, Edition 1 - 15 May 1998 17 Federal Aviation Administration What Can You Do? • AC 20-188 meant to be a starting point to create awareness – Expected to evolve over time – Add cases/information as available • Submit feedback form in AC if you have a recommendation 18 Federal Aviation Administration Questions? Section Manager: Chinh Vuong, AIR-6C1, (202) 267-8249 chinh.vuong@faa.gov 19 Federal Aviation Administration Proficiency and Peace of Mind • Fly regularly with your CFI • Perfect Practice • Document in WINGS 20 Federal Aviation Administration Thank you for attending • You are vital members of our GA safety community 21