Why did the boys crash in the plane in lord of flies?

According to Ralph, speaking of the pilot, "He must have flown off after he dropped us. He couldn't land here. Not in a plane with wheels." Apparently the pilot had ejected the 'passenger tube' containing the boys, which then crash landed on the island. According to Piggy, who said that he was sitting by the window as they were descending to the island... "I saw the other part of the plane. There were flames coming out of it." The passenger tube caused the scar in the jungle and was later dragged out to sea by the storm... "there must have been some kids still in it."