Actually a lot. Lots of small plane crashes are never reported. But frankly planes are designed if all engines go down, the pilot can safely ditch the plane in the ground. If its the ocean, well they got live rafts too. So lets say all 4 engines die out. The pilot could most likely ditch it (wouldn't be a fun ride) at any height. Saw a show on discovery channel. Guy went waht if all the enginers just fell of the plane could you land it pilot went yea I could land it. Not really sad as long as no one died.
Training. My mom has a friend who works as a waiter on aplane. Once a year they go in for a 2 week training session where they drill on all kinds or emegrices fire, bomb, gun, wings falling off. YOU NAME it they prob train fo rit.