Individually Owned: 150,657
Corporate Owned: 137,281
Tullahoma Regional Airport
Aircraft Accident/Incident Report
Tullahoma, Tennessee 37388
Saturday, June 28, 1997 14:30 CDT
NTSB Narrative Summary Released at Completion of Accident
The airplane was being used for sport parachute operations. During the initial climb after takeoff the right engine failed followed by the airplane's slow descending right turn into wooded terrain. The airplane crashed through trees and caught on fire. The fire was extinguished prior to the destruction of the airplane. Subsequent examination of the engine revealed that one crankshaft counterweight had broken its retaining lugs and was liberated inside the engine, resulting in sudden stoppage of the engine. The sudden stoppage prevented the pilot from feathering the propeller. Metallurgical examination of the crankshaft and counterweight revealed damage that was consistent with 'detuning' of the engine counterweights. Counterweight detuning results from excessively rapid throttle movements. Additionally, the engine log indicated that during an oil change 8 days before the accident, wear metal was found in the oil. The airplane continued to be flown with no further maintenance action taken.
NTSB Probable Cause Narrative
improper operation of the engine that produced internal damage, and improper servicing of the airplane by the owner/pilot mechanic that resulted in the subsequent mechanical failure of the engine crankshaft counterweight. Contributing to the accident was the pilot's inability to feather the propeller.
Event Information
| Type of Event | Accident |
| Event Date | 6/28/1997 |
| Event Day of the Week | Saturday |
| Time of Event | 1430 |
| Event Time Zone | Central Daylight Time |
| Event City | TULLAHOMA |
| Event State | TENNESSEE |
| Event Country | -- |
| Zipcode of the event site | 37388 |
| Event Date Year | 1997 |
| Event Date Month | 6 |
| MidAir Collision Indicator | No |
| On Ground Collision occurred ? | No |
| Event Location Latitude | |
| Event Location Longitude | |
| Event Location Airport | TULLAHOMA REGIONAL |
| Event Location Nearest Airport ID | THA |
| Indicates whether the acc/inc occurred off or on an airport | Off Airport/Airstrip |
| Distance from airport in statute miles | 1 |
| Degrees magnetic from airport | 210 |
| Airport Elevation | 1082 |
| Weather Briefing Completeness | Unknown |
| Investigator's weather source | Weather Observation Facility |
| Time of the weather observation | 1500 Central Daylight Time |
| Direction of event from weather observation facility (degrees) | 45 |
| Weather Observation Facility ID | THA |
| Elevation of weather observation facility | 1082 |
| Distance of event from weather observation facility (units?) | 1 |
| Time Zone of the weather observation | CDT |
| Lighting Conditions | Day |
| Lowest Ceiling Height | 0 |
| Lowest Non-Ceiling Height | 1000 |
| Sky/Lowest/Cloud Conditions | Scattered |
| Sky Condition for Lowest Ceiling | None |
| Visibility Runway Visual Range (Feet) | 0 |
| Visibility Runway Visual Value (Statute Miles) | 0 |
| Visibility (Statute Miles) | 10 |
| Air Temperature at event time (in degrees celsius) | 23 |
| Dew Point at event time (in degress fahrenheit) | 21 |
| Wind Direction (degrees magnetic) | 130 |
| Variable Wind Indicator | Unknown |
| Wind Speed (knots) | 5 |
| Wind Velocity Indicator | Unknown |
| Wind Gust Indicator | Not Gusting |
| Wind Gust (knots) | 0 |
| Altimeter Setting at event time (in. Hg) | 30 |
| Density Altitude (feet) | -- |
| Intensity of Precipitation | Unknown |
| METAR weather report | -- |
| Event Highest Injury | Serious |
| On Ground, Fatal Injuries | 0 |
| On Ground, Minor Injuries | 0 |
| On Ground, Serious Injuries | 0 |
| Injury Total Fatal | -- |
| Injury Total Minor | 7 |
| Injury Total None | -- |
| Injury Total Serious | 2 |
| Injury Total All | 9 |
| Investigating Agency | NTSB |
| NTSB Docket Number (internal use) | 805 |
| NTSB Notification Source | -- |
| NTSB Notification Date | Jun 28 1997 12:00AM |
| NTSB Notification Time | 1743 |
| Fiche Number and/or location -used to find docket information | IMAGE |
| Date of most recent change to record | Dec 8 2000 12:19PM |
| User who most recently changed record | dbo |
| Basic weather conditions | Visual Meteorological Cond |
| FAA District Office | -- |
Aircraft Involved |
|
|---|---|
Aircraft #1 |
|
| Aircraft Registration Number | N4265R |
| NTSB Number | ATL97LA091 |
| Missing Aircraft Indicator | N |
| Federal Aviation Reg. Part | Part 91: General Aviation |
| Type of Flight Plan filed | None |
| Flight plan Was Activated? | -- |
| Damage | Substantial |
| Aircraft Fire | Ground |
| Aircraft Explosion | None |
| Aircraft Manufacturer's Full Name | Beech |
| Aircraft Model | E50 |
| Aircraft Series Identifier | E50 |
| Aircraft Serial Number | LH166 |
| Certified Max Gross Weight | 7000 |
| Aircraft Category | Airplane |
| 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 | 2 |
| Number of Engines | 2 |
| Fixed gear or retractable gear | Retractable |
| Aircraft, Type of Last Inspection | Annual |
| Date of Last Inspection | Sep 26 1996 12:00AM |
| Airframe hours since last inspection | 21 |
| Airframe Hours | 14564 |
| ELT Installed | Yes |
| ELT Activated | Unknown |
| ELT Aided Location of Event Site | Unknown |
| ELT Type | -- |
| Aircraft Owner Name | CHRISTOPHER L. MARTIN |
| Aircraft Owner Street Address | 611 CEDAR LANE |
| Aircraft Owner City | TULLAHOMA |
| Aircraft Owner State | TN |
| Aircraft Owner Country | |
| Aircraft Owner Zipcode | 37388 |
| Operator is an individual? | -- |
| Operator Name | TENNESSEE SKYDIVING CENTER |
| Operator Same as Owner? | No |
| Operator Is Doing Business As | -- |
| Operator Address Same as Owner? | No |
| Operator Street Address | POST OFFICE BOX 674 |
| Operator City | TULLAHOMA |
| Operator State | TN |
| Operator Country | |
| Operator Zip code | 37388 |
| Operator Code | |
| Owner has at least one certificate | None |
| Other Operator of large aircraft? | No |
| Certified for Part 133 or 137 Operation | Unknown |
| 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) | Other Work Use |
| Second Pilot on Board | No |
| Departure Point Same as Event | Yes |
| Departure Airport Code | THA |
| Departure City | |
| Departure State | |
| Departure Country | |
| Departure Time | 1425 |
| Departure Time Zone | CDT |
| Destination Same as Local Flt | dest & departure same, accident can occur anywhere |
| Destination Airport Code | |
| Destination City | |
| Destination State | |
| Destination Country | |
| Specific Phase of Flight | Takeoff |
| Report sent to ICAO? | -- |
| Evacuation occurred | -- |
| Date of most recent change to record | Jan 2 2001 10:34AM |
| User who most recently changed record | dbo |
| Since inspection or accident | -- |
| Event Location Runway Number and Location | 18 |
| Runway Length | 5000 |
| Runway Width | 150 |
| Sight Seeing flight | No |
| Air Medical Flight | No |
| Medical Flight | -- |