Grumman GS-2F accident near Grass Valley, California, July 9, 1993
On July 9, 1993 at about 11:30 pm local time, a Grumman GS-2F, registered N450DF, was substantially damaged in an accident near Grass Valley, California. It was a public-use flight under general aviation rules (Part 91). The NTSB record does not give the injuries. The weather was visual conditions (good weather).
The NTSB's probable cause their words, unchanged
The NTSB has not yet published a probable cause for this accident. Investigations usually take one to two years; this page updates when the final report is released.
Source: NTSB aviation accident database, copy made October 12, 2026. Docket and reports at the NTSB.
What the record shows
- Date
- July 9, 1993 · about 11:30 pm local time · cases in 1993
- Place
- Grass Valley, California · map
- Type
- Accident
- Injuries
- The NTSB record does not give the injuries.
- Weather
- visual conditions (good weather)
- Aircraft
- Grumman GS-2F
- Registration
- N450DF · registry record
- Damage
- Substantial damage
- Flight
- Public-use flight · general aviation rules (Part 91)
The factual record from the NTSB's investigation tables, in plain English
The aircraft
- Last inspection: inspection type not recorded; 0 hours since
- Seats: 0
- Landing gear: fixed
- Not recorded
- Operator: Calif Dept of Forestry
The flight
- Departed from: O17
- Destination: 017
- Flight plan: none
- Runway 0
Weather at the time
- Light: not reported
- Wind: from 250° at 15 knots
- Visibility: 15 statute miles
- Sky: clear
- Temperature: 91°F (33°C), dew point 54°F (12°C)
- Altimeter: 30.00 inHg
- Observation at 4:30 pm
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 N450DF the same tail number, which may have belonged to a different aircraft at the time
Connections how this case links to the rest of the register
- N450DF on the register today · the tail number may have moved to another aircraft since
- Grumman 442 aircraft on the register
- Accidents and incidents in California 9,069 since 1982 · 1,090 in the last ten years
- California 27,610 aircraft registered
- Other NTSB records under N450DF 1 records · the number may have belonged to another aircraft at the time
The whole map of how records connect · these connections as data: /graph/accident/LAX93T%23A05.json.
The bigger picture in Aviation Analytics: accidents over time since 1982, by model, by phase of flight and conditions, by place and on the map.
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 does not name anyone involved, its policy at this time. A preliminary report can change; the final report usually follows one to two years later, and the page is refreshed when it does.