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John Clark, Director, Office of Aviation Safety

John Clark, Director, Office of Aviation Safety. Design & Certification of the MD-80 Horizontal Stabilizer Trim System. Trim System Design: Recommendations. Eliminate catastrophic effects by incorporating fail-safe mechanism

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John Clark, Director, Office of Aviation Safety

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  1. John Clark, Director, Office of Aviation Safety Design & Certification of the MD-80 Horizontal Stabilizer Trim System

  2. Trim System Design:Recommendations • Eliminate catastrophic effects by incorporating fail-safe mechanism • Preclude certification of new trim systems with single-point failure modes • Ensure wear-related failures are addressed by the certification process

  3. Trim System Design:Considerations • Single-point failure • 1x10-9 design requirement • Reliance on maintenance versus design change

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