What was found
WHILE IN FOR A SCHEDULED INSPECTION, OUR TWIN ENGINE HELICOPTER EXPERIENCED A LOW POWER ENGINE PLOT ON NR 1 ENGINE. AN INTERESTING SIDE NOTE WAS THAT WITH BOTH ENGINES RUNNING, NORMAL TEMPERATURES APPEARED ON BOTH ENGINES AND NO POWER DEGRADATION WAS NOTED ON THE NR 1 ENGINE. A POWER RECOVERY GAS PATH WASH WAS PERFORMED IAW THEMFG MM GUIDELINES, AND AN INSPECTION WAS PERFORMED IAW THE STANDARD TROUBLESHOOTING GUIDELINES FOR LOW POWER. AFTER A SECOND POWER PLOT CAME IN LOW, IT WAS DECIDED TO REPLACE THE ENGINE WITH AN ENGINE THAT HAD A KNOWN TEST CELL VALUE OF A +10. INSTALLED ON THE AIRCRAFT, THIS ENGINE COULD ONLY PRODUCE A –8. FINALLY, CAPPING OFF THE CUSTOMER BLEED AIR PORTS RESULTED IN A NORMAL POWER CH