What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
Pilot statement:
"I was on the downwind of a nomal pattern,RUNWAY30 was in used.I was trying to climb to 1900 at 60KT,after I was there I tried to get my airspeed back to 75KT,at that moment I had feel the abnomal vibration,just after a second I can smeel something was burning,and right after that the low RPM warning light and horn was on. So I desided to enter an aotorotation and made a radio call to tower immediately,than I just picked a good landing spot to have a emergency landing. After the landing I shutdown the helicopter and turn off the fuel shut-off valve and check the helicopter for any fuel leaking or oil leaking.I found the helicoter was all right,so I monicter the radio and communicate with kiwa tower with my landing light and strobe light still on,waiting for help."
Disassembly of affected area revealed a fractured fanshaft. Visual inspection of exposed fanshaft shows beach marking or step wear, consistent with metal fatigue. Subsequent damage was found on the cooling fan shroud and the main and rotor drive belt tensioner disconnected.
Parts secured for ntsb/manufacturer evaluation.
As the FAA filed it
PILOT STATEMENT:
"I WAS ON THE DOWNWIND OF A NOMAL PATTERN,RUNWAY30 WAS IN USED.I WAS TRYING TO CLIMB TO 1900 AT 60KT,AFTER I WAS THERE I TRIED TO GET MY AIRSPEED BACK TO 75KT,AT THAT MOMENT I HAD FEEL THE ABNOMAL VIBRATION,JUST AFTER A SECOND I CAN SMEEL SOMETHING WAS BURNING,AND RIGHT AFTER THAT THE LOW RPM WARNING LIGHT AND HORN WAS ON.SO I DESIDED TO ENTER AN AOTOROTATION AND MADE A RADIO CALL TO TOWER IMMEDIATELY,THAN I JUST PICKED A GOOD LANDING SPOT TO HAVE A EMERGENCY LANDING.AFTER THE LANDING I SHUTDOWN THE HELICOPTER AND TURN OFF THE FUEL SHUT-OFF VALVE AND CHECK THE HELICOPTER FOR ANY FUEL LEAKING OR OIL LEAKING.I FOUND THE HELICOTER WAS ALL RIGHT,SO I MONICTER THE RADIO AND COMMUNICATE WITH KIWA TOWER WITH MY LANDING LIGHT AND STROBE LIGHT STILL ON,WAITING FOR HELP."
DISASSEMBLY OF AFFECTED AREA REVEALED A FRACTURED FANSHAFT. VISUAL INSPECTION OF EXPOSED FANSHAFT SHOWS BEACH MARKING OR STEP WEAR, CONSISTENT WITH METAL FATIGUE. SUBSEQUENT DAMAGE WAS FOUND ON THE COOLING FAN SHROUD AND THE MAIN AND ROTOR DRIVE BELT TENSIONER DISCONNECTED.
PARTS SECURED FOR NTSB/MANUFACTURER 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.