NTSB investigations · 2
Matched to this aircraft by N36MV and the event date: up to this one’s cancellation.
NTSB WPR14LA062Accident · No injuriesLimited investigationFinal reportChowchilla, CAThe failure of the torsional drive coupling, which resulted in a loss of drive to the main rotor system during low-altitude flight.NTSB WPR10LA127Accident · No injuriesLimited investigationFinal reportLos Banos, CAA partial loss of engine power due to a failure of the throttle interconnect hardware, which resulted in a hard landing.
FAA incident reports · 2
FAA accident and incident reports matched to this aircraft by N36MV and the event date: up to this one’s cancellation.
Accident 20131209023649ACruise/Level Flight · Madera, CAThe aircraft was performing agricultural flight operations, frost control, when the torsional coupling failed. Being at low altitude, the RPM went quickly resulting in a hard landing. The main rotor made contact with the tail boom, the skids were damaged, the…Accident 20100202026659ALanding: Touchdown · Los Banos, CAWhen returning to the load truck after completion of an aerial application the pilot noticed that his throttle did not respond. The pilot was at an altitude of 50 ft when he noticed the loss of throttle control. The aircraft engine was slowly loosing engine…
Service difficulty reports · 3
Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model.
SDR 97ZZZX2838Intake Valve · wornTHE VALVE STEM UNDER THE KEEPER'S WAS HEAVILY WORN. THIS CONDITION WAS ALSO FOUND ON 4 OTHER VALVES (INTAKE) ALL HAVING THE SAME TOTAL TIME AND PART NUMBER. THE 6TH VALVE WAS A LYCOMING WITH THE SAME TIME AND INSTALLATION DATE. NO PROBLEM FOUND.SDR 97ZZZX1825Valve · failedTHE HELICOPTER WAS RUNNING ROUGH SO A COMPRESSION CHECK WAS RUN. THE NR 2 CYLINDER HELD NO COMPRESSION AND WAS REMOVED FOR INSPECTION. NOTED A .1250 INCH BY .25 INCH SECTION OF THE VALVE FACE WAS MISSING. THE MISSING SECTION WAS IRREGULAR IN SHAPE AND APPEASDR 97ZZZX1133Cylinder · not to specDURING ASSEMBLY OF ENGINE, MEASURED DRY TAPPET CLEARANCE FROM .107 INCH TO .187 INCH. LYC OHM REQUIRES .028 INCH TO .080 INCH. RETURNED 6 CYLINDERS TO EC/SW WHERE THEY CUT/REMOVED MATERIAL FROM THE CYL FLANGE. CYLINDERS WERE RE-INSTALLED. THESE CYLINDERS J