Individually Owned: 151,845
Corporate Owned: 143,699
Aircraft Accident/Incident Report
Makakilo City, Hawaii 96707
Friday, March 2, 2012 17:40 HST
NTSB Narrative Summary Released at Completion of Accident
During external load operations, the right (No. 2) engine experienced a loss of engine power; the associated engine chip light illuminated. The pilot executed a running landing to a nearby landing zone. During the landing, the helicopter encountered rough terrain, which resulted in deformation of the tail boom skin. Postaccident examination of the No. 2 engine revealed that a turbine blade had separated from the 3rd stage turbine wheel. Metallurgical examination of the blade determined that it had failed as a result of high-cycle fatigue probably due to an intermittent vibratory state. The engine manufacturer issued a service bulletin in 2006 and a revised bulletin in 2009 that systematically removed the 3rd stage turbine wheel that was susceptible to this failure mode from the fleet of Model 250 Series II engines. The service bulletin required that the 3rd stage turbine wheel must be replaced at overhaul or if the helicopter experienced an one-engine inoperable (OEI) condition. The turbine wheel had not been replaced, and it could not be determined if the helicopter had experienced an OEI condition.
NTSB Probable Cause Narrative
A partial loss of engine power while maneuvering over rough/uneven terrain that was precipitated by the failure of a 3rd stage turbine blade as a result of high-cycle fatigue.
Event Information
| Type of Event | Accident |
| Event Date | 3/2/2012 |
| Event Day of the Week | Friday |
| Time of Event | 1740 |
| Event Time Zone | Hawaii Standard Time |
| Event City | Makakilo City |
| Event State | HAWAII |
| Event Country | -- |
| Zipcode of the event site | 96707 |
| Event Date Year | 2012 |
| Event Date Month | 3 |
| MidAir Collision Indicator | No |
| On Ground Collision occurred ? | No |
| Event Location Latitude | -- |
| Event Location Longitude | -- |
| Event Location Airport | -- |
| Event Location Nearest Airport ID | -- |
| Indicates whether the acc/inc occurred off or on an airport | Off Airport/Airstrip |
| Distance from airport in statute miles | -- |
| Degrees magnetic from airport | -- |
| Airport Elevation | -- |
| Weather Briefing Completeness | -- |
| Investigator's weather source | Weather Observation Facility |
| Time of the weather observation | 1753 Hawaii Standard Time |
| Direction of event from weather observation facility (degrees) | 110 |
| Weather Observation Facility ID | PHNL |
| Elevation of weather observation facility | 13 |
| Distance of event from weather observation facility (units?) | 10 |
| Time Zone of the weather observation | HST |
| Lighting Conditions | Day |
| Lowest Ceiling Height | -- |
| Lowest Non-Ceiling Height | 2600 |
| Sky/Lowest/Cloud Conditions | Few |
| Sky Condition for Lowest Ceiling | None |
| Visibility Runway Visual Range (Feet) | -- |
| Visibility Runway Visual Value (Statute Miles) | -- |
| Visibility (Statute Miles) | 10 |
| Air Temperature at event time (in degrees celsius) | 36 |
| Dew Point at event time (in degress fahrenheit) | 18 |
| Wind Direction (degrees magnetic) | -- |
| Variable Wind Indicator | -- |
| Wind Speed (knots) | -- |
| Wind Velocity Indicator | Calm |
| Wind Gust Indicator | -- |
| Wind Gust (knots) | -- |
| Altimeter Setting at event time (in. Hg) | 30.01 |
| Density Altitude (feet) | -- |
| Intensity of Precipitation | -- |
| METAR weather report | -- |
| Event Highest Injury | None |
| On Ground, Fatal Injuries | -- |
| On Ground, Minor Injuries | -- |
| On Ground, Serious Injuries | -- |
| Injury Total Fatal | -- |
| Injury Total Minor | -- |
| Injury Total None | 1 |
| Injury Total Serious | -- |
| Injury Total All | -- |
| Investigating Agency | NTSB |
| NTSB Docket Number (internal use) | 31506 |
| NTSB Notification Source | FAA Operations Center |
| NTSB Notification Date | -- |
| NTSB Notification Time | -- |
| Fiche Number and/or location -used to find docket information | -- |
| Date of most recent change to record | Aug 9 2013 1:47PM |
| User who most recently changed record | johb |
| Basic weather conditions | Visual Meteorological Cond |
| FAA District Office | -- |
Aircraft Involved |
|
|---|---|
Aircraft #1 |
|
| Aircraft Registration Number | N101MZ |
| NTSB Number | WPR12LA125 |
| Missing Aircraft Indicator | -- |
| Federal Aviation Reg. Part | Part 133: Rotorcraft Ext. Load |
| Type of Flight Plan filed | None |
| Flight plan Was Activated? | No |
| Damage | Substantial |
| Aircraft Fire | None |
| Aircraft Explosion | None |
| Aircraft Manufacturer's Full Name | AEROSPATIALE |
| Aircraft Model | AS 355F1 |
| Aircraft Series Identifier | -- |
| Aircraft Serial Number | 5045 |
| Certified Max Gross Weight | 5291 |
| Aircraft Category | Helicopter |
| Aircraft Registration Class | -- |
| Aircraft is a homebuilt? | No |
| Flight Crew Seats | 1 |
| Cabin Crew Seats | -- |
| Passenger Seats | -- |
| Total number of seats on the aircraft | 7 |
| Number of Engines | 2 |
| Fixed gear or retractable gear | Fixed |
| Aircraft, Type of Last Inspection | 100 Hour |
| Date of Last Inspection | Jan 8 2012 12:00AM |
| Airframe hours since last inspection | 92 |
| Airframe Hours | 11827 |
| ELT Installed | Yes |
| ELT Activated | No |
| ELT Aided Location of Event Site | No |
| ELT Type | -- |
| Aircraft Owner Name | TGR HELICOPTERS |
| Aircraft Owner Street Address | 2403 E BULLARD AVE |
| Aircraft Owner City | CLOVIS |
| Aircraft Owner State | CA |
| Aircraft Owner Country | USA |
| Aircraft Owner Zipcode | 93612 |
| Operator is an individual? | No |
| Operator Name | TGR HELICOPTERS |
| Operator Same as Owner? | Yes |
| Operator Is Doing Business As | -- |
| Operator Address Same as Owner? | Yes |
| Operator Street Address | 2403 E BULLARD AVE |
| Operator City | CLOVIS |
| Operator State | CA |
| Operator Country | USA |
| Operator Zip code | 93612 |
| Operator Code | -- |
| Owner has at least one certificate | None |
| Other Operator of large aircraft? | No |
| Certified for Part 133 or 137 Operation | -- |
| Operator Certificate Number | -- |
| Indicates whether an air carrier operation was scheduled or not | -- |
| Indicates Domestic or International Flight | -- |
| Operator carrying Pax/Cargo/Mail | -- |
| Type of Flying (Per_Bus / Primary) | External Load |
| Second Pilot on Board | No |
| Departure Point Same as Event | Yes |
| Departure Airport Code | -- |
| Departure City | Makakilo City |
| Departure State | HI |
| Departure Country | USA |
| Departure Time | 1500 |
| Departure Time Zone | HST |
| Destination Same as Local Flt | dest & departure same, accident can occur anywhere |
| Destination Airport Code | -- |
| Destination City | Makakilo City |
| Destination State | HI |
| Destination Country | USA |
| Specific Phase of Flight | -- |
| Report sent to ICAO? | -- |
| Evacuation occurred | -- |
| Date of most recent change to record | Jun 18 2013 3:01PM |
| User who most recently changed record | coos |
| Since inspection or accident | Time of Accident |
| Event Location Runway Number and Location | N/A |
| Runway Length | -- |
| Runway Width | -- |
| Sight Seeing flight | No |
| Air Medical Flight | No |
| Medical Flight | -- |