747_200 level flight 1 engine

Thought that was neat. The article said that given the right conditions, a 747_200 could sustain level flight on 1 engine. That was all they said.the article was about a 747_200 that ran into volcano ash and had 4 engines shut down. One was started about FL 140 and that is where the article said that. With one engine they were able to sustain a 300 ft/min drop. So level flight is a possibility. Reminded me of the 747 that lost an engine after TO in California and flew to Europe with 1 fuel stop I think. I wondered if another engine was lost over the middle of the ocean, how far could they go. Looks like quite a ways.JimCYWG