Narrative:

Prior to this event; I experienced an in-flight engine failure on the right engine shortly after takeoff from ZZZ. I declared an emergency and diverted to ZZZ1. A safe; single engine landing was completed. Upon inspection by local maintenance X; the main pressure fuel line had broke causing the failure. A new fuel line was ordered and installed by maintenance. After a successful leak check and ground run; maintenance signed-off the aircraft for flight. Two days later; I flew the aircraft on a test flight with no passengers to ensure it had no further issues. I leveled off at 6;000 ft and approximately five minutes after level off; the right engine failed again. I declared an emergency and completed a safe; single engine landing at the ZZZ1 airport.it was discovered that the same main pressure fuel line had broke; causing the engine failure. On the following day; a new [fuel] line was ordered and a thorough inspection by maintenance was completed to discover the problem. No issue was discovered and the mechanic believed the fuel line we ordered was defective. After the new line was installed we completed another ground leak check and engine run. Everything checked out 'okay' and maintenance once again signed the plane off for flight. The next day; I completed an additional ground run check at a 'climb' power setting on the right engine for approximately 10-15 minutes continuous to ensure there was no issue with the right engine before takeoff. Everything checked out 'okay' and the engine ran normally. I departed ZZZ1 (no passengers) with no issues and climbed to my cruising altitude.after about 15-minutes cruising at FL240; the right engine flamed out approximately 30 miles north/northeast of the ZZZ2 airport. I completed the engine securing procedures; declared an emergency; and diverted direct to the ZZZ2 airport for an emergency landing. All procedures and checklists were complied with along with the engine securing and single engine landing emergency checklists. Arff was standing by and a safe; single engine landing was completed. I was able to taxi to the FBO on my own power. Upon inspection by the local maintenance facility; the main fuel pressure line broke causing the inflight engine failure. The aircraft is remaining in ZZZ2 at the FBO until a determination of the cause of the fuel line continuing to break shortly after takeoff and a successful repair is made.

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Original NASA ASRS Text

Title: Captain reports he had three separate and sequential incidences of Number 2 Engine flaming out in cruise that required single engine approaches in the same Piper PA-42 aircraft. All three inflight engine failures were due to the Main Fuel High Pressure stainless steel line breaking near the Fuel Control Unit (FCU) on the same PT 6A-41 engine.

Narrative: Prior to this event; I experienced an in-flight engine failure on the right engine shortly after takeoff from ZZZ. I declared an emergency and diverted to ZZZ1. A safe; single engine landing was completed. Upon inspection by Local Maintenance X; the Main Pressure Fuel line had broke causing the failure. A new fuel line was ordered and installed by Maintenance. After a successful Leak Check and Ground Run; Maintenance signed-off the aircraft for flight. Two days later; I flew the aircraft on a Test Flight with no passengers to ensure it had no further issues. I leveled off at 6;000 FT and approximately five minutes after level off; the right engine failed again. I declared an emergency and completed a safe; single engine landing at the ZZZ1 airport.It was discovered that the same Main Pressure Fuel line had broke; causing the engine failure. On the following day; a new [fuel] line was ordered and a thorough inspection by Maintenance was completed to discover the problem. No issue was discovered and the Mechanic believed the fuel line we ordered was defective. After the new line was installed we completed another Ground Leak Check and Engine Run. Everything checked out 'okay' and Maintenance once again signed the plane off for flight. The next day; I completed an additional Ground Run Check at a 'Climb' power setting on the right engine for approximately 10-15 minutes continuous to ensure there was no issue with the right engine before takeoff. Everything checked out 'okay' and the engine ran normally. I departed ZZZ1 (no passengers) with no issues and climbed to my cruising altitude.After about 15-minutes cruising at FL240; the right engine flamed out approximately 30 miles north/northeast of the ZZZ2 airport. I completed the engine securing procedures; declared an emergency; and diverted direct to the ZZZ2 airport for an emergency landing. All procedures and checklists were complied with along with the engine securing and Single Engine Landing Emergency Checklists. ARFF was standing by and a safe; single engine landing was completed. I was able to taxi to the FBO on my own power. Upon inspection by the Local Maintenance facility; the Main Fuel Pressure line broke causing the inflight engine failure. The aircraft is remaining in ZZZ2 at the FBO until a determination of the cause of the fuel line continuing to break shortly after takeoff and a successful repair is made.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.