Narrative:

Flying on top of WX with engine deice system activated. As we began descent to FL240; the right engine spooled down. While completing the flight checklist; the engine oil pressure light illuminated. The engine shut down; restart checklist was completed; and the engine relit successfully. No other problems were encountered; and a normal landing was made at ZZZ. Mechanics were summoned to investigate the engine. Fuel samples were normal with no water present; and the anti-icing additive was normal. After completing the power checks; the aircraft manufacturer was notified. We are still investigating the cause; and at this time; we believe the problem lies within the P3 line. It is my understanding that this situation has occurred with other aircraft in the past; and a service bulletin is being issued to heat the P3 line with engine bleed air. We will certainly comply with this bulletin in a timely manner in hopes that this occurrence will not recur. Supplemental information from acn 789496: we were descending on the arrival out of FL350 with the engine anti-ice on; when the PIC instructed me to turn on the wing heat. Shortly after turning on the wing heat; the right engine rolled back. The PIC instructed me to advise ATC that our right engine had rolled back and get the checklist out for engine failure; and while I was looking up the engine failure procedures the PIC stated the engine failed and he selected fuel cutoff position for the right engine. At that time he instructed me to find the engine air-start procedures. I initiated the restart and the engine restarted and ran normal and landed without further abnormalities. After advising the maintenance department and their research the probable cause was P3 bleed line freezing and causing the engine to go to idle position. I think had the PIC waited just a little bit that the control of the engine would have returned to normal. I also think that CRM was not used effectively because he decided to shut down the engine so rapidly and not even confer with me; while I was busy with the checklist that just that amount of time might have been enough to regain control of the engine.

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Original NASA ASRS Text

Title: BEECHJET 400 FLT CREW REPORTS ENGINE ROLL BACK DURING DESCENT. ENGINE IS SHUT DOWN AND RESTARTED WITH NO FURTHER PROBLEMS.

Narrative: FLYING ON TOP OF WX WITH ENG DEICE SYS ACTIVATED. AS WE BEGAN DSCNT TO FL240; THE R ENG SPOOLED DOWN. WHILE COMPLETING THE FLT CHKLIST; THE ENG OIL PRESSURE LIGHT ILLUMINATED. THE ENG SHUT DOWN; RESTART CHKLIST WAS COMPLETED; AND THE ENG RELIT SUCCESSFULLY. NO OTHER PROBS WERE ENCOUNTERED; AND A NORMAL LNDG WAS MADE AT ZZZ. MECHS WERE SUMMONED TO INVESTIGATE THE ENG. FUEL SAMPLES WERE NORMAL WITH NO WATER PRESENT; AND THE ANTI-ICING ADDITIVE WAS NORMAL. AFTER COMPLETING THE PWR CHKS; THE ACFT MANUFACTURER WAS NOTIFIED. WE ARE STILL INVESTIGATING THE CAUSE; AND AT THIS TIME; WE BELIEVE THE PROB LIES WITHIN THE P3 LINE. IT IS MY UNDERSTANDING THAT THIS SITUATION HAS OCCURRED WITH OTHER ACFT IN THE PAST; AND A SVC BULLETIN IS BEING ISSUED TO HEAT THE P3 LINE WITH ENG BLEED AIR. WE WILL CERTAINLY COMPLY WITH THIS BULLETIN IN A TIMELY MANNER IN HOPES THAT THIS OCCURRENCE WILL NOT RECUR. SUPPLEMENTAL INFO FROM ACN 789496: WE WERE DSNDING ON THE ARR OUT OF FL350 WITH THE ENG ANTI-ICE ON; WHEN THE PIC INSTRUCTED ME TO TURN ON THE WING HEAT. SHORTLY AFTER TURNING ON THE WING HEAT; THE R ENG ROLLED BACK. THE PIC INSTRUCTED ME TO ADVISE ATC THAT OUR R ENG HAD ROLLED BACK AND GET THE CHKLIST OUT FOR ENG FAILURE; AND WHILE I WAS LOOKING UP THE ENG FAILURE PROCS THE PIC STATED THE ENG FAILED AND HE SELECTED FUEL CUTOFF POS FOR THE R ENG. AT THAT TIME HE INSTRUCTED ME TO FIND THE ENG AIR-START PROCS. I INITIATED THE RESTART AND THE ENG RESTARTED AND RAN NORMAL AND LANDED WITHOUT FURTHER ABNORMALITIES. AFTER ADVISING THE MAINT DEPT AND THEIR RESEARCH THE PROBABLE CAUSE WAS P3 BLEED LINE FREEZING AND CAUSING THE ENG TO GO TO IDLE POS. I THINK HAD THE PIC WAITED JUST A LITTLE BIT THAT THE CTL OF THE ENG WOULD HAVE RETURNED TO NORMAL. I ALSO THINK THAT CRM WAS NOT USED EFFECTIVELY BECAUSE HE DECIDED TO SHUT DOWN THE ENG SO RAPIDLY AND NOT EVEN CONFER WITH ME; WHILE I WAS BUSY WITH THE CHKLIST THAT JUST THAT AMOUNT OF TIME MIGHT HAVE BEEN ENOUGH TO REGAIN CTL OF THE ENG.

Data retrieved from NASA's ASRS site as of May 2009 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.