As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIGHT ENGINE REAR INNER BYPASS DUCT SEPARATED FROM AIRCRAFT DURING TAKEOFF ROLL. REMOVED REAR INNER BYPASS DUCT ASSEMBLY DUE TO DAMAGED CONE. INSTALLED AN OVERHAULED ASSEMBLY (OVERHAULED BY PRATT AND WHITNEY ENGINE SERVICES, CRS NR LM1R301K, UNDER WO NR 6128484). WORK PERFORMED IAW PRATT AND WHITNEY JT15D-5D M/M, CHAPTER 72-70-02.