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Sources say that CFM, the maker of jet engines, is working on a plan B to reduce fuel consumption.

Industry sources claim that the French-US jet engine manufacturer CFM is evaluating a "more conventional" "advanced-ducted" engine design, alongside its preferred option for a radical open fan concept. The industry is debating fuel-savings as well as reducing emissions.

The'venture' co-owned by GE Aerospace, France and Safran, has been promoting an open-rotor, with a large fan exposed instead of a conventional casing, for the next generation of Airbus and Boeing aircraft.

This would "generate fuel savings and emissions reductions of 20% in a well-publicised research program called RISE.

It is also examining a design that would contain the fan inside a shell, similar to those on engines today. According to experts,'such designs can save fuel while being more adaptable.

Airbus and Boeing's commercial strategies could be affected by the choice of technologies.

A Safran employee's description of duties revealed the project to investigate alternative architecture.

Employee's duties included work on future civil- and defence-related?projects. These projects included the "Open Fan", and another, separate project known as "Advanced Ducted-Large", or ADL.

Three sources in the industry confirmed that CFM was working on "advanced" ducted architecture as part of RISE. This architecture targets a cluster technologies before any engine design.

Both Safran and GE declined to comment. The French company will report its earnings on Friday.

CFM, its two shareholders and the company have always said that they are ready to supply whatever engines the planemakers need. They have also never ruled out a conventional design even though they have praised the benefits of open-bladed aircraft.

The emergence of an alternative code name is a first tangible indication that the alternative engine is taken seriously enough to merit separate attention. (Reporting and editing by Bernadettebaum; Tim Hepher)

(source: Reuters)