The X-15-2 (serial number AF56-6671) became the first X-15 aircraft to test the million-horsepower XLR-99 rocket engine in flight. The X-15-2 was delivered to Edwards Air Force Base in April 1959 and completed 31 flights (9 with the interim XLR-11 engines) before it was damaged during an emergency landing in November 1962, and eventually repaired and modified to become the "advanced" X-15A-2.
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