Individually Owned: 150,657
Corporate Owned: 137,281
Kerrville Municipal Airport
Aircraft Accident/Incident Report
Kerrville, Texas 78028
Wednesday, July 2, 1997 14:30 CDT
NTSB Narrative Summary Released at Completion of Accident
The airplane was on its climb to cruise when the engine lost power. The pilot performed a forced landing short of the runway in rough and uneven terrain. An examination of the engine revealed that the #1 cylinder piston was seized in the cylinder, the piston rings were broken, the piston head was deteriorated around the edge down to the top compression ring with a portion of the ring missing, metal was deposited on the intake valve seat, and the intake valve was stuck in the open position. The #1 cylinder dome was damaged and scaring was noted on the cylinder walls. Aluminum particles were found in the #1 cylinder spark plugs and embedded in the #1 cylinder combustion chamber and internal components of the engine. According to the manufacturer, no discrepancies were found with the engine components that 'would have caused detonation/preignition to [the] number 1 cylinder.' The cylinder met the SAE chemistry requirements. The manufacturer's metallurgist stated that 'the burning of the piston crown most likely is the result of either detonation or pre-ignition.'
NTSB Probable Cause Narrative
The disintegration of the #1 cylinder piston resulting from a detonation/pre-ignition condition due to an unknown reason. A factor was the lack of suitable terrain for the forced landing.
Event Information
| Type of Event | Accident |
| Event Date | 7/2/1997 |
| Event Day of the Week | Wednesday |
| Time of Event | 1430 |
| Event Time Zone | Central Daylight Time |
| Event City | KERRVILLE |
| Event State | TEXAS |
| Event Country | -- |
| Zipcode of the event site | 78028 |
| Event Date Year | 1997 |
| Event Date Month | 7 |
| MidAir Collision Indicator | No |
| On Ground Collision occurred ? | No |
| Event Location Latitude | |
| Event Location Longitude | |
| Event Location Airport | KERRVILLE MUNICIPAL |
| Event Location Nearest Airport ID | ERV |
| 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 | 1617 |
| Weather Briefing Completeness | Unknown |
| Investigator's weather source | Pilot |
| Time of the weather observation | 0 |
| Direction of event from weather observation facility (degrees) | 0 |
| Weather Observation Facility ID | |
| Elevation of weather observation facility | 0 |
| Distance of event from weather observation facility (units?) | 0 |
| Time Zone of the weather observation | |
| Lighting Conditions | Day |
| Lowest Ceiling Height | 0 |
| Lowest Non-Ceiling Height | 4000 |
| 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) | 32 |
| Dew Point at event time (in degress fahrenheit) | -- |
| Wind Direction (degrees magnetic) | 180 |
| Variable Wind Indicator | Unknown |
| Wind Speed (knots) | 10 |
| Wind Velocity Indicator | Unknown |
| Wind Gust Indicator | Not Gusting |
| Wind Gust (knots) | 0 |
| Altimeter Setting at event time (in. Hg) | -- |
| Density Altitude (feet) | -- |
| 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 | 4 |
| Injury Total Serious | -- |
| Injury Total All | -- |
| Investigating Agency | NTSB |
| NTSB Docket Number (internal use) | 501 |
| NTSB Notification Source | -- |
| NTSB Notification Date | Jul 2 1997 12:00AM |
| NTSB Notification Time | 1623 |
| Fiche Number and/or location -used to find docket information | IMAGE |
| Date of most recent change to record | Dec 8 2000 12:24PM |
| User who most recently changed record | dbo |
| Basic weather conditions | Visual Meteorological Cond |
| FAA District Office | -- |
Aircraft Involved |
|
|---|---|
Aircraft #1 |
|
| Aircraft Registration Number | N761FM |
| NTSB Number | FTW97LA246 |
| 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 | Cessna |
| Aircraft Model | T210M |
| Aircraft Series Identifier | T210M |
| Aircraft Serial Number | 21062222 |
| Certified Max Gross Weight | 3800 |
| 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 | 6 |
| Number of Engines | 1 |
| Fixed gear or retractable gear | Retractable |
| Aircraft, Type of Last Inspection | Annual |
| Date of Last Inspection | Mar 11 1997 12:00AM |
| Airframe hours since last inspection | 18 |
| Airframe Hours | 1442 |
| ELT Installed | Yes |
| ELT Activated | No |
| ELT Aided Location of Event Site | Unknown |
| ELT Type | -- |
| Aircraft Owner Name | TYLER TRINITY CORPORATION |
| Aircraft Owner Street Address | P. O. BOX 7305 |
| Aircraft Owner City | TYLER |
| Aircraft Owner State | TX |
| Aircraft Owner Country | |
| Aircraft Owner Zipcode | 75711 |
| Operator is an individual? | -- |
| Operator Name | CLYDE F. SANFORD III |
| Operator Same as Owner? | No |
| Operator Is Doing Business As | -- |
| Operator Address Same as Owner? | No |
| Operator Street Address | 1719 MCDONALD DRIVE |
| Operator City | TYLER |
| Operator State | TX |
| Operator Country | |
| Operator Zip code | 75701 |
| 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) | Personal |
| Second Pilot on Board | No |
| Departure Point Same as Event | Yes |
| Departure Airport Code | ERV |
| Departure City | |
| Departure State | |
| Departure Country | |
| Departure Time | 1425 |
| Departure Time Zone | CDT |
| Destination Same as Local Flt | -- |
| Destination Airport Code | TYR |
| Destination City | TYLER |
| Destination State | TX |
| Destination Country | |
| Specific Phase of Flight | Climb |
| 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 | 20 |
| Runway Length | 4050 |
| Runway Width | 60 |
| Sight Seeing flight | No |
| Air Medical Flight | No |
| Medical Flight | -- |