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The UACL JT15D-1 engine is a 2200 lb thrust turbofan engine of the high bypass ratio type, the first small engine of the type to be certified and placed in production. The engine is briefly described, and the scope of development testing and resources applied is reviewed. A selection of major development problems is covered, and future developments are indicated.

When United Aircraft Corp.'s JT15D engine was first considered for potential high-altitude, low flight speed, long-endurance RPV applications by the U.S. Air Force, the questions were: 1. Will the engine run at these altitudes? 2. Can it deliver the required thrust? 3. Can it deliver the required power extraction? 4. What is the specific fuel consumption? 5. What oil system modifications are needed? 6. What is the optimum control system? 7. Are there other unknowns? A JT15D-4 turbofan engine, with only minor modifications which were easily incorporated into engines coming off the production line, proved more than adequate to achieve predicted endurance goals and measured performance.