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11. FAR 121.387 Flight Engineer Under which condition is a flight engineer required as a flight crewmember in FAR Part 121 operations? A. If the airplane is being flown on proving flights, with revenue cargo aboard B. If the airplane is powered by more than two turbine engines C. If required by the airplane's type certificate 12. FAR 121.389 Flight Navigator and Specialized Navigation Equipment Routes that require a flight navigator are listed in the A. Airplane Flight Manual B. International Flight Information Manual C. Air Carrier's Operations Specifications 13. FAR 121.391 Flight Attendants When an air carrier airplane with a seating capacity of 187 has 137 passengers on board, what is the minimum number of flight attendants required? A. Five B. Four C. Three