John Clark, Director, Office of Aviation Safety

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John Clark, Director, Office of Aviation Safety

• Design Certification
• of the MD-80 Horizontal Stabilizer Trim System

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Trim System DesignRecommendations

• 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

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Trim System DesignConsiderations

• Single-point failure
• 1x10-9 design requirement
• Reliance on maintenance versus design change

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