Safety Assumptions

Photo of No. 3 engine and punctured fuselage
No. 3 engine and punctured fuselage

The following design and safety assumptions are relevant to this accident:

  1. There were no harmful interacting vibratory modes existing within the engine operating range

  2. Based on the engine's design and certification standards, the engine structure would contain damage resulting from a single rotor blade failure at the outermost retention groove

  3. Per oxygen dispensing unit regulations, oxygen would be immediately and easy accessible to all passengers and crew members

  4. Portable oxygen bottles would be immediately accessible for each cabin attendant

  5. Pressure loss would be of equal magnitude throughout the airplane. The aneroid would detect unacceptable cabin pressure throughout the entire airplane equally

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