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American Airlines Flight 1400 St. Louis, Missouri

American Airlines Flight 1400 St. Louis, Missouri. Harald Reichel Powerplants. Left Nacelle Findings. Significant fire occurred Fire confined to nacelle cavity No engine core problems Combustible fluid source could not be determined

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American Airlines Flight 1400 St. Louis, Missouri

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  1. American Airlines Flight 1400St. Louis, Missouri Harald Reichel Powerplants

  2. Left Nacelle Findings • Significant fire occurred • Fire confined to nacelle cavity • No engine core problems • Combustible fluid source could not be determined • The ignition source of the fire was the start system failure

  3. Pneumatic supply line ATSV air filter Air turbine start valve (ATSV) Air turbine starter (ATS) Engine Start System Overview

  4. Air Turbine Starter Findings Does not normally operate during flight Uncommanded operation during takeoff and climb Failed, acting as ignition source Event air turbine starter

  5. ATSV Air Filter Findings Filter element Filter element missing End cap Fitting End cap Loose end cap Air flow AA1400 ATSV air filter New ATSV air filter

  6. Air Turbine Start Valve- Normal Operation Solenoid Cut-away Illustrating butterfly valve Ball Valve Armature Pin Piston To Air Turbine Starter Manual O/R Button To Air Turbine Starter

  7. Cap blocks air flow Solenoid operates No air flow No air flow Manual O/R button AA1400 Event No-Start History

  8. Ball valve Manual override pin bent Manual Override Pin and Ball Valve

  9. Cap vibrates and allows air flow Ball valve partially open Pin bent AA1400 Event Takeoff and Climb

  10. Summary Disintegrated ATSV-air filter caused intermittent no-starts ATSV manual override pin was found bent Bent pin caused uncommanded ATS activation at takeoff Catastrophic failure of the ATS ignited combustible fluid present in the nacelle

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