Individually Owned: 150,657
Corporate Owned: 137,281
Knoxville Downtown Island Airport
Aircraft Accident/Incident Report
Knoxville, Tennessee 37920
Tuesady, July 2, 1996 13:50 EDT
NTSB Narrative Summary Released at Completion of Accident
Shortly after takeoff, about 50-75 feet above the runway, one of the two propeller blades from the left propeller separated. The FAA designee took the controls and landed the airplane with the landing gear extended on grass adjacent to the runway. The airplane traveled off the runway and came to rest upright with the nose landing gear collapsed. Examination of the left propeller revealed that the blade No. 1 hub arm failed due to fatigue. Review of the propeller maintenance records revealed that the propeller was last overhauled on October 18, 1985, and had accumulated a total time of 2,979.7 hours since manufacturer and 963.2 hours since overhaul.
NTSB Probable Cause Narrative
Fatigue failure of the blade No. 1 hub arm of the left propeller.
Event Information
| Type of Event | Accident |
| Event Date | 7/2/1996 |
| Event Day of the Week | Tuesday |
| Time of Event | 1350 |
| Event Time Zone | Eastern Daylight Time |
| Event City | KNOXVILLE |
| Event State | TENNESSEE |
| Event Country | -- |
| Zipcode of the event site | 37920 |
| Event Date Year | 1996 |
| Event Date Month | 7 |
| MidAir Collision Indicator | No |
| On Ground Collision occurred ? | No |
| Event Location Latitude | |
| Event Location Longitude | |
| Event Location Airport | KNOXVILLE DOWNTOWN ISLAND |
| Event Location Nearest Airport ID | DKX |
| Indicates whether the acc/inc occurred off or on an airport | On Airport |
| Distance from airport in statute miles | -- |
| Degrees magnetic from airport | -- |
| Airport Elevation | 833 |
| Weather Briefing Completeness | Unknown |
| Investigator's weather source | Weather Observation Facility |
| Time of the weather observation | 1400 Eastern Daylight Time |
| Direction of event from weather observation facility (degrees) | 360 |
| Weather Observation Facility ID | DKX |
| Elevation of weather observation facility | 833 |
| Distance of event from weather observation facility (units?) | 1 |
| Time Zone of the weather observation | EDT |
| Lighting Conditions | Day |
| Lowest Ceiling Height | 0 |
| Lowest Non-Ceiling Height | 0 |
| Sky/Lowest/Cloud Conditions | Clear |
| 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) | 33 |
| Dew Point at event time (in degress fahrenheit) | 20 |
| Wind Direction (degrees magnetic) | 250 |
| Variable Wind Indicator | Unknown |
| Wind Speed (knots) | 12 |
| Wind Velocity Indicator | Unknown |
| Wind Gust Indicator | Unknown |
| Wind Gust (knots) | 16 |
| Altimeter Setting at event time (in. Hg) | 29 |
| Density Altitude (feet) | 3300 |
| Intensity of Precipitation | Unknown |
| METAR weather report | -- |
| Event Highest Injury | None |
| On Ground, Fatal Injuries | 0 |
| On Ground, Minor Injuries | 0 |
| On Ground, Serious Injuries | 0 |
| Injury Total Fatal | -- |
| Injury Total Minor | -- |
| Injury Total None | 2 |
| Injury Total Serious | -- |
| Injury Total All | -- |
| Investigating Agency | NTSB |
| NTSB Docket Number (internal use) | 1491 |
| NTSB Notification Source | -- |
| NTSB Notification Date | Jul 2 1996 12:00AM |
| NTSB Notification Time | 1446 |
| Fiche Number and/or location -used to find docket information | IMAGE |
| Date of most recent change to record | Dec 8 2000 10:13AM |
| User who most recently changed record | dbo |
| Basic weather conditions | Visual Meteorological Cond |
| FAA District Office | -- |
Aircraft Involved |
|
|---|---|
Aircraft #1 |
|
| Aircraft Registration Number | N3061P |
| NTSB Number | MIA96LA173 |
| 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 | None |
| Aircraft Explosion | None |
| Aircraft Manufacturer's Full Name | Piper |
| Aircraft Model | PA-23-150 |
| Aircraft Series Identifier | PA-23-150 |
| Aircraft Serial Number | 23-977 |
| Certified Max Gross Weight | 3500 |
| 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 | 5 |
| Number of Engines | 2 |
| Fixed gear or retractable gear | Retractable |
| Aircraft, Type of Last Inspection | Annual |
| Date of Last Inspection | Jun 1 1996 12:00AM |
| Airframe hours since last inspection | 14 |
| Airframe Hours | 2980 |
| ELT Installed | Yes |
| ELT Activated | Yes |
| ELT Aided Location of Event Site | No |
| ELT Type | -- |
| Aircraft Owner Name | WILLIAM R. MAHAFEY JR. |
| Aircraft Owner Street Address | 1101 HARBOR DRIVE SOUTH |
| Aircraft Owner City | VENICE |
| Aircraft Owner State | FL |
| Aircraft Owner Country | |
| Aircraft Owner Zipcode | 34285 |
| Operator is an individual? | -- |
| Operator Name | KNOXVILLE FLIGHT TRAINING CTR |
| Operator Same as Owner? | No |
| Operator Is Doing Business As | -- |
| Operator Address Same as Owner? | No |
| Operator Street Address | 2701 SPENCE PL. |
| Operator City | KNOXVILLE |
| Operator State | TN |
| Operator Country | |
| Operator Zip code | 37920 |
| Operator Code | DIKA |
| Owner has at least one certificate | Yes - certificate holder |
| 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) | Unknown |
| Second Pilot on Board | Yes |
| Departure Point Same as Event | Yes |
| Departure Airport Code | DKX |
| Departure City | |
| Departure State | |
| Departure Country | |
| Departure Time | 1350 |
| Departure Time Zone | EDT |
| 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 | -- |
| Report sent to ICAO? | -- |
| Evacuation occurred | -- |
| Date of most recent change to record | Jan 2 2001 10:30AM |
| User who most recently changed record | dbo |
| Since inspection or accident | -- |
| Event Location Runway Number and Location | 26 |
| Runway Length | 3497 |
| Runway Width | 75 |
| Sight Seeing flight | No |
| Air Medical Flight | No |
| Medical Flight | -- |