Individually Owned: 150,657
Corporate Owned: 137,281
Aircraft Accident/Incident Report
Bradenton, Florida 34209
Monday, August 26, 2002 20:35 EDT
NTSB Narrative Summary Released at Completion of Accident
The pilot said that while in cruise flight at an altitude of 1,000 feet, a speed of about 130 knots, and about 60 percent torque, without warning he heard a loud explosion from the right side of the helicopter, with simultaneous No. 2 engine fire and failure warning lights and indications, along with severe vibrations. He said that the helicopter yawed several times from left to right and he heard a "whopping" sound. He also said that at the same time the No. 1 engine torque meter needle moving rapidly from about the 9 to 3 or 4 o'clock positions on the gauge. The investigation revealed two of the power turbine blades and four rear bearing support housing (RBSH) failed in overload. The hub had been displaced from the engine centerline, and a deflection had occurred at the engine case axial midpoint, along with a misalignment of the inlet housing and the rear bearing support housing (RBSH). The resultant damage to the gas producer (GP) system, was consistent with an assembly error and mechanical failure having occurred by the loss of critical internal operating clearances and radial support for the rotors. Continued engine operation as the failure progressed led to compressor surge and the emergence of combustion gases from the No. 2 engine inlet, which ignited inlet cowling material. The No. 1 engine ingested smoke and combustion by-products from the engine cowling fire which caused a temporary stall condition.
NTSB Probable Cause Narrative
Improper maintenance/installation of the No. 2 engine power turbine (PT) wheel assembly by company maintenance personnel, which resulted in deflection at the engine case axial midpoint and misalignment between the inlet housing and the rear bearing support housing (RBSH) which resulted in damage to the engine and an in-flight fire.
Event Information
| Type of Event | Incident |
| Event Date | 8/26/2002 |
| Event Day of the Week | Monday |
| Time of Event | 2035 |
| Event Time Zone | Eastern Daylight Time |
| Event City | Bradenton |
| Event State | FLORIDA |
| Event Country | -- |
| Zipcode of the event site | 34209 |
| Event Date Year | 2002 |
| Event Date Month | 8 |
| MidAir Collision Indicator | No |
| On Ground Collision occurred ? | No |
| Event Location Latitude | 272858N |
| Event Location Longitude | 0823123W |
| 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 | Not pertinent |
| Investigator's weather source | Weather Observation Facility |
| Time of the weather observation | 35 Eastern Daylight Time |
| Direction of event from weather observation facility (degrees) | -- |
| Weather Observation Facility ID | SPG |
| Elevation of weather observation facility | -- |
| Distance of event from weather observation facility (units?) | -- |
| Time Zone of the weather observation | EDT |
| Lighting Conditions | Dusk |
| Lowest Ceiling Height | -- |
| Lowest Non-Ceiling Height | -- |
| Sky/Lowest/Cloud Conditions | Clear |
| 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) | 28 |
| Dew Point at event time (in degress fahrenheit) | 23 |
| Wind Direction (degrees magnetic) | 220 |
| Variable Wind Indicator | Wind direction could be determined |
| Wind Speed (knots) | 5 |
| Wind Velocity Indicator | -- |
| Wind Gust Indicator | Gusting |
| Wind Gust (knots) | 0 |
| Altimeter Setting at event time (in. Hg) | 29.91 |
| 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 | 5 |
| Injury Total Serious | -- |
| Injury Total All | -- |
| Investigating Agency | NTSB |
| NTSB Docket Number (internal use) | 17189 |
| NTSB Notification Source | FAA ATL Comm. Center |
| NTSB Notification Date | Aug 26 2002 12:00AM |
| NTSB Notification Time | 2140 |
| Fiche Number and/or location -used to find docket information | DMS |
| Date of most recent change to record | Jan 27 2005 3:52PM |
| User who most recently changed record | NTSB\JOHB |
| Basic weather conditions | Visual Meteorological Cond |
| FAA District Office | Tampa, Florida |
Aircraft Involved |
|
|---|---|
Aircraft #1 |
|
| Aircraft Registration Number | N528SF |
| NTSB Number | MIA02IA160 |
| Missing Aircraft Indicator | -- |
| Federal Aviation Reg. Part | Part 135: Air Taxi & Commuter |
| Type of Flight Plan filed | Company VFR |
| Flight plan Was Activated? | Yes |
| Damage | Minor |
| Aircraft Fire | In-flight |
| Aircraft Explosion | None |
| Aircraft Manufacturer's Full Name | Eurocopter Deutschland GMBH |
| Aircraft Model | MBB BK-117 A4 |
| Aircraft Series Identifier | -- |
| Aircraft Serial Number | 7104 |
| Certified Max Gross Weight | 7055 |
| Aircraft Category | Helicopter |
| Aircraft Registration Class | U.S. Registered/U.S. Soil |
| Aircraft is a homebuilt? | No |
| Flight Crew Seats | -- |
| Cabin Crew Seats | -- |
| Passenger Seats | -- |
| Total number of seats on the aircraft | 6 |
| Number of Engines | 2 |
| Fixed gear or retractable gear | Fixed |
| Aircraft, Type of Last Inspection | -- |
| Date of Last Inspection | -- |
| Airframe hours since last inspection | -- |
| Airframe Hours | -- |
| ELT Installed | No |
| ELT Activated | No |
| ELT Aided Location of Event Site | No |
| ELT Type | -- |
| Aircraft Owner Name | ROCKY MOUNTAIN HELICOPTERS |
| Aircraft Owner Street Address | 300 West 800 South |
| Aircraft Owner City | Provo |
| Aircraft Owner State | UT |
| Aircraft Owner Country | USA |
| Aircraft Owner Zipcode | 84603 |
| Operator is an individual? | No |
| Operator Name | -- |
| Operator Same as Owner? | Yes |
| Operator Is Doing Business As | -- |
| Operator Address Same as Owner? | Yes |
| Operator Street Address | -- |
| Operator City | -- |
| Operator State | -- |
| Operator Country | -- |
| Operator Zip code | -- |
| Operator Code | R7MA |
| Owner has at least one certificate | -- |
| Other Operator of large aircraft? | -- |
| Certified for Part 133 or 137 Operation | -- |
| Operator Certificate Number | -- |
| Indicates whether an air carrier operation was scheduled or not | Non-scheduled |
| Indicates Domestic or International Flight | Domestic |
| Operator carrying Pax/Cargo/Mail | Passenger Only |
| Type of Flying (Per_Bus / Primary) | -- |
| Second Pilot on Board | No |
| Departure Point Same as Event | No |
| Departure Airport Code | -- |
| Departure City | Naples |
| Departure State | FL |
| Departure Country | USA |
| Departure Time | 1910 |
| Departure Time Zone | EDT |
| Destination Same as Local Flt | -- |
| Destination Airport Code | -- |
| Destination City | St. Petersburg |
| Destination State | FL |
| Destination Country | USA |
| Specific Phase of Flight | Cruise - normal |
| Report sent to ICAO? | Yes |
| Evacuation occurred | Yes |
| Date of most recent change to record | -- |
| User who most recently changed record | -- |
| Since inspection or accident | -- |
| Event Location Runway Number and Location | NA |
| Runway Length | -- |
| Runway Width | -- |
| Sight Seeing flight | No |
| Air Medical Flight | Yes |
| Medical Flight | Medical Emergency |