As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: FLIGHT CREW REPORTED THE ENGINE #1 STALLED AT FL310 230KTS IN A LEFT HAND TURN. THE ENGINE ROLLED BACK ABOUT 1/2 WAY AND THEN RETURNED TO NORMAL OPERATION. MAINTENANCE REVIEWED SKYVIEW AND NOTED THERE WERE NO ASSOCIATED FAULT MESSAGES. WHEN MAINTENANCE STARTED THE #1 ENGINE THEY OBSERVED A MOMENTARY LOUD BANG WITH VISIBLE FLAME AND SMOKE IN THE TAIL PIPE ON MULTIPLE STARTS. AN INSPECTION OF THE HPT, LPT, BOOSTER AND HPC RESULTED IN NO FINDINGS. **SUPPLEMENTAL REPORT WILL BE SUBMITTED** (OPEN)