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Content: If you are in the San Francisco Bay area and would like initial or recurrent multi engine training, 

    please contact the author of this article, Anton Sabev. Are multi-engine airplanes really safer? Why require an additional rating to fly multi-engine airplanes? If these questions intrigue you, read on ...
Muti Engine Safety Math
Per flying hour a Twin Engine Airplane compared to a Single is: 2 times more likely to develop problems in ANY of its engines; 4 times less likely to develop problems in TWO of its engines. Surprisingly safety doesn't improve significantly with 3 or 4 engines. A dual failure in the 3 engine types usually 

  creates an unacceptable loss of performance. In the 4 engine types a dual failure on the same side creates a 

  directional control dilemma. The Pilot Makes All The Difference
Two engines are better than one, but ...
Proficiency
Incompletely trained or rusty pilots can fly multi engine airplanes, but not safely.