What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
Narrative: aircraft departed mercy hospital at Des Moines, IA, enroute to atlantic, IA, to pick up a patient. At 1700 feet, in level flight, the pilot felt a yaw and observed the left engine had failed. The pilot secured the failed engine and requested clearance to Des Moines International Airport. While on base to rwy 13, the left engine fire warning light illuminated. The pilot armed and fired the left engine fire bottle and the fire warning light extinguished. An uneventful single engine landing followed. Maintenance investigation revealed neither fire bottle discharged. Both squibs intact. N1 compressor is frozen, power turbine turns freely. No metal on mag plugs. Transition duct is collapsed on inside. Helo is being trucked to denver, CO, for further evaluation. This investigation will remain open pending engine tear down and evaluation.
As the FAA filed it
NARRATIVE: AIRCRAFT DEPARTED MERCY HOSPITAL AT DES MOINES, IA, ENROUTE TO ATLANTIC, IA, TO PICK UP A PATIENT. AT 1700 FEET, IN LEVEL FLIGHT, THE PILOT FELT A YAW AND OBSERVED THE LEFT ENGINE HAD FAILED. THE PILOT SECURED THE FAILED ENGINE AND REQUESTED CLEARANCE TO DES MOINES INTERNATIONAL AIRPORT. WHILE ON BASE TO RWY 13, THE LEFT ENGINE FIRE WARNING LIGHT ILLUMINATED. THE PILOT ARMED AND FIRED THE LEFT ENGINE FIRE BOTTLE AND THE FIRE WARNING LIGHT EXTINGUISHED. AN UNEVENTFUL SINGLE ENGINE LANDING FOLLOWED. MAINTENANCE INVESTIGATION REVEALED NEITHER FIRE BOTTLE DISCHARGED. BOTH SQUIBS INTACT. N1 COMPRESSOR IS FROZEN, POWER TURBINE TURNS FREELY. NO METAL ON MAG PLUGS. TRANSITION DUCT IS COLLAPSED ON INSIDE. HELO IS BEING TRUCKED TO DENVER, CO, FOR FURTHER EVALUATION. THIS INVESTIGATION WILL REMAIN OPEN PENDING ENGINE TEAR DOWN AND EVALUATION.
NTSB investigation
The NTSB’s investigation of this event, with its probable cause and findings. Matched to this report by N-number and date.