This paper presents the technical status of a new type aft-turbofan aircraft powerplant, designated as the General Electric CJ805-21. The successful development to date of this aft-fan engine has amply demonstrated the feasibility of a major increase in power rating and a significant improvement in altitude cruise fuel economy by converting the CJ805-3 commercial turbojet to an aft-turbofan engine. The advanced technology, performance capabilities, development and maintenance factors emphasize the importance of the CJ805-21.

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