Cessna 150M accident near Santa Paula, California, August 10, 1998
On August 10, 1998 at about 3:30 pm local time, a Cessna 150M, registered N704UV, was substantially damaged in an accident near Santa Paula, California. It was an instructional flight under general aviation rules (Part 91). No one was hurt; 1 person was on board or involved. The weather was visual conditions (good weather).
The NTSB's probable cause their words, unchanged
Failure of the number one cylinder due to a fatigue crack that had originated from corrosion pits at the cooling fin.
Source: NTSB aviation accident database, copy made October 5, 2026. Docket and reports at the NTSB.
What the record shows
- Date
- August 10, 1998 · about 3:30 pm local time
- Place
- Santa Paula, California · map
- Type
- Accident
- Injuries
- No one was hurt; 1 person was on board or involved.
- Weather
- visual conditions (good weather)
- Aircraft
- Cessna 150M · all 150Ms on the register
- Registration
- N704UV · no longer on the register · serial 15078893
- Damage
- Substantial damage
- Flight
- Instructional flight · general aviation rules (Part 91)
The NTSB's narrative final · quoted from the NTSB record
The student pilot was on a local solo flight. After practicing various maneuvers the engine began to run rough, vibrate, and smoke. The pilot made a forced landing into a riverbed and came to rest inverted. The number one cylinder was found to have a circumferential crack extending approximately 325 degrees around the barrel between the 8th and 9th cooling fins. The cylinder was further examined by a metallurgist, who reported that the barrel fins were covered with an iron oxide. The examination further revealed a fatigue crack that emanated from corrosion pits at the root radius between the 8th and 9th cooling fins. The remaining portion of the fracture exhibited an overstress separation.
The complete narrative as the NTSB published it. The NTSB's docket holds the report as a PDF and any photographs, statements and other documents from the investigation.
The factual record from the NTSB's investigation tables, in plain English
Pilot
- Certificate: student
- Flight time: 39 hours in all; 27 in this make and model; 18 in the last 90 days; 5 in the last 30 days; 5 as pilot in command
- Medical certificate: Class 3 (valid medical--no waivers/lim.)
- Seat: left
The aircraft
- Airframe total time: 6,354 hours
- Last inspection: 100-hour inspection, July 8, 1998; 39 hours since
- Maximum gross weight: 1,600 lb
- Seats: 2
- Landing gear: fixed
- Engine: Continental O-200-A (piston); 0 hours total
The flight
- Departed from: SZP at 3:00 pm
- Flight plan: none
- Runway 0
Weather at the time
- Light: daylight
- Visibility: 20 statute miles
- Sky: clear
- Temperature: 75°F (24°C), dew point 0°F (-18°C)
Injuries
| Fatal | Serious | Minor | None | |
|---|---|---|---|---|
| Crew | 1 |
Documents from the investigation the NTSB's docket: the evidence folder behind the report
The docket, the folder of records gathered during an investigation (maintenance records, photographs, witness statements, examinations), has not been read from the NTSB for this case yet; the list appears here once it has. Open the docket at the NTSB.
Other NTSB records under N704UV the same tail number, which may have belonged to a different aircraft at the time
Everything on this page comes from the NTSB's public records. The narrative, probable cause and findings are the NTSB's own words; the coded tables behind the report are written out in plain English, with pilots' ages, home towns and medical details left out. The documents and photographs are the NTSB's docket, shown as the NTSB released them. This site's own text never names anyone involved. A preliminary report can change; the final report usually follows one to two years later, and the page is refreshed when it does.